Edgar Filing: ONEOK INC /NEW/

form_10-q.htm

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

X Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended March 31, 2011

___ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from __________ to __________.

Commission file number 001-13643

ONEOK, Inc.

(Exact name of registrant as specified in its charter)

Oklahoma	73-1520922
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

100 West Fifth Street, Tulsa, OK	74103
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code (918) 588-7000

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days. Yes X No __

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every

Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes X No __

Indicate by checkmark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer X Accelerated filer __ Non-accelerated filer __ Smaller reporting company__

Indicate by checkmark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes __ No X

On April 28, 2011, the Company had 107,120,130 shares of common stock outstanding.

Table of Contents

ONEOK, Inc.

TABLE OF CONTENTS

Part I.	Financial Information	Page No.
Item 1.	Financial Statements (Unaudited)
	Consolidated Statements of Income - Three Months Ended March 31, 2011 and 2010	5
	Consolidated Balance Sheets - March 31, 2011 and December 31, 2010	6-7
	Consolidated Statements of Cash Flows - Three Months Ended March 31, 2011 and 2010	9
	Consolidated Statement of Changes in Equity - Three Months Ended March 31, 2011	10-11
	Consolidated Statements of Comprehensive Income - Three Months Ended March 31, 2011 and 2010	12
	Notes to Consolidated Financial Statements	13-29
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	30-49
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	50
Item 4.	Controls and Procedures	51
Part II.	Other Information
Item 1.	Legal Proceedings	51
Item 1A.	Risk Factors	51
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	51
Item 3.	Defaults Upon Senior Securities	51
Item 4.	(Removed and Reserved)	52
Item 5.	Other Information	52
Item 6.	Exhibits	52-53
Signature		54

As used in this Quarterly Report, references to “we,” “our” or “us” refer to ONEOK, Inc., an Oklahoma corporation, and its predecessors and subsidiaries, unless the context indicates otherwise.

The statements in this Quarterly Report that are not historical information, including statements concerning plans and objectives of management for future operations, economic performance or related assumptions, are forward-looking statements. Forward-looking statements may include words such as “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” “should,” “goal,” “forecast,” “guidance,” “could,” “may,” “continue,” “might,” “potential,” “scheduled” and other words and terms of similar meaning. Although we believe that our expectations regarding future events are based on reasonable assumptions, we can give no assurance that such expectations or assumptions will be achieved. Important factors that could cause actual results to differ materially from those in the forward-looking statements are described under Part I, Item 2, Management’s Discussion and Analysis of Financial Condition and Results of Operations, “Forward-Looking Statements” and Part II, Item 1A, “Risk Factors” in this Quarterly Report and under Part I, Item 1A, “Risk Factors,” in our Annual Report.

INFORMATION AVAILABLE ON OUR WEBSITE

We make available on our website copies of our Annual Report, Quarterly Reports, Current Reports on Form 8-K, amendments to those reports filed or furnished to the SEC pursuant to Section 13(a) or 15(d) of the Exchange Act and reports of holdings of our securities filed by our officers and directors under Section 16 of the Exchange Act as soon as reasonably practicable after filing such material electronically or otherwise furnishing it to the SEC. Our website and any contents thereof are not incorporated by reference into this report.

We also make available on our website the Interactive Data Files required to be submitted and posted pursuant to Rule 405 of Regulation S-T. In accordance with Rule 402 of Regulation S-T, the Interactive Data Files shall not be deemed to be “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Table of Contents

GLOSSARY

The abbreviations, acronyms and industry terminology used in this Quarterly Report are defined as follows:

AFUDC

Allowance for funds used during construction

Annual Report

Annual Report on Form 10-K for the year ended December 31, 2010

ASU

Accounting Standards Update

Bbl

Barrels, 1 barrel is equivalent to 42 United States gallons

Bbl/d

Barrels per day

BBtu/d

Billion British thermal units per day

Bcf

Billion cubic feet

Bcf/d

Billion cubic feet per day

Btu(s)

British thermal units, a measure of the amount of heat required to raise the

temperature of one pound of water one degree Fahrenheit

Bushton Plant

Bushton Gas Processing Plant

CFTC

Commodities Futures Trading Commission

Clean Air Act

Federal Clean Air Act, as amended

Clean Water Act

Federal Water Pollution Control Act Amendments of 1972, as amended

Dodd-Frank Act

Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010

EBITDA

Earnings before interest expense, income taxes, depreciation and amortization

EPA

United States Environmental Protection Agency

Exchange Act

Securities Exchange Act of 1934, as amended

FASB

Financial Accounting Standards Board

FERC

Federal Energy Regulatory Commission

GAAP

Accounting principles generally accepted in the United States of America

KCC

Kansas Corporation Commission

KDHE

Kansas Department of Health and Environment

LDCs

Local distribution companies

LIBOR

London Interbank Offered Rate

MBbl

Thousand barrels

MBbl/d

Thousand barrels per day

Mcf

Thousand cubic feet

MDth/d

Thousand dekatherms per day

MMBbl

Million barrels

MMBtu

Million British thermal units

MMBtu/d

Million British thermal units per day

MMcf

Million cubic feet

MMcf/d

Million cubic feet per day

Moody’s

Moody’s Investors Service, Inc.

Natural Gas Policy Act

Natural Gas Policy Act of 1978, as amended

NGL products

Marketable natural gas liquid purity products, such as ethane, ethane/propane mix,

propane, iso-butane, normal butane and natural gasoline

NGL(s)

Natural gas liquid(s)

Northern Border Pipeline

Northern Border Pipeline Company

NYMEX

New York Mercantile Exchange

OCC

Oklahoma Corporation Commission

ONEOK

ONEOK, Inc.

ONEOK 2011 Credit Agreement

ONEOK's five-year, $1.2 billion revolving credit agreement dated April 5, 2011

ONEOK Credit Agreement

ONEOK's amended and restated $1.2 billion revolving credit agreement dated

July 14, 2006

ONEOK Partners

ONEOK Partners, L.P.

ONEOK Partners Credit Agreement

ONEOK Partners’ $1.0 billion amended and restated revolving credit agreement

dated March 30, 2007

ONEOK Partners GP

ONEOK Partners GP, L.L.C., a wholly owned subsidiary of ONEOK and the sole

general partner of ONEOK Partners

OPIS

Oil Price Information Service

Overland Pass Pipeline Company

Overland Pass Pipeline Company LLC

Quarterly Report

Quarterly Report(s) on Form 10-Q

RRC

Railroad Commission of Texas

Table of Contents

S&P

Standard & Poor’s Financial Services LLC

SEC

Securities and Exchange Commission

Securities Act

Securities Act of 1933, as amended

XBRL

eXtensible Business Reporting Language

Table of Contents


PART I - FINANCIAL INFORMATION
ITEM 1. FINANCIAL STATEMENTS
ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF INCOME

	Three Months Ended
	March 31,
(Unaudited)	2011			2010
	(Thousands of dollars, except per share amounts)

Revenues	$	3,866,888		$	3,923,967
Cost of sales and fuel		3,233,339			3,304,648
Net margin		633,549			619,319
Operating expenses
Operations and maintenance		194,606			180,272
Depreciation and amortization		79,391			77,856
General taxes		29,006			23,073
Total operating expenses		303,003			281,201
Loss on sale of assets		(510	)		(786	)
Operating income		330,036			337,332
Equity earnings from investments (Note J)		32,092			21,116
Allowance for equity funds used during construction		466			247
Other income		3,369			2,909
Other expense		(2,287	)		(1,053	)
Interest expense		(79,349	)		(76,520	)
Income before income taxes		284,327			284,031
Income taxes		(84,981	)		(97,311	)
Net income		199,346			186,720
Less: Net income attributable to noncontrolling interests		69,216			32,181
Net income attributable to ONEOK	$	130,130		$	154,539

Earnings per share of common stock (Note H)
Net earnings per share, basic	$	1.22		$	1.46
Net earnings per share, diluted	$	1.19		$	1.44

Average shares of common stock (thousands)
Basic		107,020			106,132
Diluted		109,179			107,410

Dividends declared per share of common stock	$	0.52		$	0.44
See accompanying Notes to Consolidated Financial Statements.

Table of Contents

ONEOK, Inc. and Subsidiaries
CONSOLIDATED BALANCE SHEETS
	March 31,		December 31,
(Unaudited)	2011		2010
Assets	(Thousands of dollars)
Current assets
Cash and cash equivalents	$	870,086	$	31,034
Accounts receivable, net		1,280,125		1,332,726
Gas and natural gas liquids in storage		407,671		708,933
Commodity imbalances		74,762		94,854
Energy marketing and risk management assets (Notes B and C)		56,431		61,940
Other current assets		106,699		149,558
Total current assets		2,795,774		2,379,045

Property, plant and equipment
Property, plant and equipment		10,036,440		9,854,485
Accumulated depreciation and amortization		2,597,547		2,541,302
Net property, plant and equipment		7,438,893		7,313,183

Investments and other assets
Goodwill and intangible assets		1,020,977		1,022,894
Energy marketing and risk management assets (Notes B and C)		1,715		1,921
Investments in unconsolidated affiliates (Note J)		1,186,588		1,188,124
Other assets		595,649		594,008
Total investments and other assets		2,804,929		2,806,947
Total assets	$	13,039,596	$	12,499,175
See accompanying Notes to Consolidated Financial Statements.

Table of Contents

ONEOK, Inc. and Subsidiaries
CONSOLIDATED BALANCE SHEETS
	March 31,			December 31,
(Unaudited)	2011			2010
Liabilities and equity	(Thousands of dollars)
Current liabilities
Current maturities of long-term debt	$	418,242		$	643,236
Notes payable (Note D)		-			556,855
Accounts payable		1,131,922			1,215,468
Commodity imbalances		250,310			288,494
Energy marketing and risk management liabilities (Notes B and C)		51,123			22,800
Other current liabilities		450,051			424,259
Total current liabilities		2,301,648			3,151,112

Long-term debt, excluding current maturities (Note E)		4,976,458			3,686,542

Deferred credits and other liabilities
Deferred income taxes		1,223,250			1,171,997
Energy marketing and risk management liabilities (Notes B and C)		6,154			2,221
Other deferred credits		575,068			566,462
Total deferred credits and other liabilities		1,804,472			1,740,680

Commitments and contingencies (Note L)

Equity (Note F)
ONEOK shareholders' equity:
Common stock, $0.01 par value:
authorized 300,000,000 shares; issued 122,847,421 shares and outstanding
107,105,747 shares at March 31, 2011; issued 122,815,636 shares and
outstanding 106,815,582 shares at December 31, 2010		1,228			1,228
Paid-in capital		1,384,287			1,392,671
Accumulated other comprehensive loss (Note G)		(135,137	)		(108,802	)
Retained earnings		1,901,279			1,826,800
Treasury stock, at cost: 15,741,674 shares at March 31, 2011 and
16,000,054 shares at December 31, 2010		(652,573	)		(663,274	)
Total ONEOK shareholders' equity		2,499,084			2,448,623

Noncontrolling interests in consolidated subsidiaries		1,457,934			1,472,218

Total equity		3,957,018			3,920,841
Total liabilities and equity	$	13,039,596		$	12,499,175
See accompanying Notes to Consolidated Financial Statements.

Table of Contents

This page intentionally left blank.

Table of Contents

ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF CASH FLOWS	Three Months Ended
	March 31,
(Unaudited)	2011			2010
	(Thousands of dollars)
Operating Activities
Net income	$	199,346		$	186,720
Depreciation and amortization		79,391			77,856
Allowance for equity funds used during construction		(466	)		(247	)
Loss on sale of assets		510			786
Equity earnings from investments		(32,092	)		(21,116	)
Distributions received from unconsolidated affiliates		27,607			21,998
Deferred income taxes		52,044			19,542
Share-based compensation expense		7,902			4,566
Other		(333	)		(221	)
Changes in assets and liabilities:
Accounts receivable		53,410			235,922
Gas and natural gas liquids in storage		301,262			177,305
Accounts payable		(77,843	)		(268,987	)
Commodity imbalances, net		(18,092	)		(58,903	)
Energy marketing and risk management assets and liabilities		(12,683	)		24,522
Other assets and liabilities		67,818			158,974
Cash provided by operating activities		647,781			558,717
Investing Activities
Capital expenditures (less allowance for equity funds used during construction)		(194,679	)		(68,273	)
Contributions to unconsolidated affiliates		(250	)		(197	)
Distributions received from unconsolidated affiliates		4,904			1,531
Proceeds from sale of assets		540			563
Cash used in investing activities		(189,485	)		(66,376	)
Financing Activities
Borrowing (repayment) of notes payable, net		(556,855	)		(571,870	)
Issuance of debt, net of discounts		1,295,450			-
Long-term debt financing costs		(10,986	)		-
Payment of debt		(228,137	)		(3,333	)
Repurchase of common stock		(48	)		(5	)
Issuance of common stock		5,024			4,663
Issuance of common units, net of discounts		-			322,721
Dividends paid		(55,651	)		(46,701	)
Distributions to noncontrolling interests		(68,041	)		(59,782	)
Cash provided by (used in) financing activities		380,756			(354,307	)
Change in cash and cash equivalents		839,052			138,034
Cash and cash equivalents at beginning of period		31,034			29,399
Cash and cash equivalents at end of period	$	870,086		$	167,433
See accompanying Notes to Consolidated Financial Statements.

Table of Contents

ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENT OF CHANGES IN EQUITY


	ONEOK Shareholders' Equity
								Accumulated
	Common							Other
	Stock		Common		Paid-in			Comprehensive
(Unaudited)	Issued		Stock		Capital			Income (Loss)
	(Shares)		(Thousands of dollars)

December 31, 2010		122,815,636	$	1,228	$	1,392,671		$	(108,802	)
Net income		-		-		-			-
Other comprehensive income		-		-		-			(26,335	)
Repurchase of common stock		-		-		-			-
Common stock issued		31,785		-		(8,384	)		-
Common stock dividends -
$0.52 per share		-		-		-			-
Distributions to noncontrolling interests		-		-		-			-
March 31, 2011		122,847,421	$	1,228	$	1,384,287		$	(135,137	)
See accompanying Notes to Consolidated Financial Statements.

Table of Contents

ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENT OF CHANGES IN EQUITY
(Continued)

	ONEOK Shareholders' Equity
							Noncontrolling
							Interests in
	Retained			Treasury			Consolidated			Total
(Unaudited)	Earnings			Stock			Subsidiaries			Equity
	(Thousands of dollars)

December 31, 2010	$	1,826,800		$	(663,274	)	$	1,472,218		$	3,920,841
Net income		130,130			-			69,216			199,346
Other comprehensive income		-			-			(15,459	)		(41,794	)
Repurchase of common stock		-			(48	)		-			(48	)
Common stock issued		-			10,749			-			2,365
Common stock dividends -
$0.52 per share		(55,651	)		-			-			(55,651	)
Distributions to noncontrolling interests		-			-			(68,041	)		(68,041	)
March 31, 2011	$	1,901,279		$	(652,573	)	$	1,457,934		$	3,957,018

Table of Contents

ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	Three Months Ended
	March 31,
(Unaudited)	2011			2010
	(Thousands of dollars)

Net income	$	199,346		$	186,720
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on energy marketing and risk management
assets/liabilities, net of tax of $1,415 and $(18,839), respectively		(16,888	)		43,489
Realized gains in net income, net of tax of $12,235 and
$8,022, respectively		(20,116	)		(10,058	)
Unrealized holding losses on available-for-sale securities,
net of tax of $63 and $62, respectively		(99	)		(97	)
Change in pension and postretirement benefit plan liability, net of tax
of $2,947 and $2,533, respectively		(4,673	)		(4,016	)
Other, net of tax of $11 and $(11), respectively		(18	)		18
Total other comprehensive income (loss), net of tax		(41,794	)		29,336
Comprehensive income		157,552			216,056
Less: Comprehensive income attributable to noncontrolling interests		53,757			48,468
Comprehensive income attributable to ONEOK	$	103,795		$	167,588
See accompanying Notes to Consolidated Financial Statements.

Table of Contents

ONEOK, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

A. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Our accompanying unaudited consolidated financial statements have been prepared in accordance with GAAP and reflect all adjustments that, in our opinion, are necessary for a fair presentation of the results for the interim periods presented. All such adjustments are of a normal recurring nature. The 2010 year-end consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. These unaudited consolidated financial statements should be read in conjunction with our audited consolidated financial statements in our Annual Report. Due to the seasonal nature of our business, the results of operations for the three months ended March 31, 2011, are not necessarily indicative of the results that may be expected for a 12-month period.

Our significant accounting policies are consistent with those disclosed in Note A of the Notes to Consolidated Financial Statements in our Annual Report.

Recently Issued Accounting Standards Update - In January 2010, the FASB issued ASU 2010-06, “Improving Disclosures about Fair Value Measurements,” which requires separate disclosure of purchases, sales, issuances and settlements in the reconciliation of our Level 3 fair value measurements. We adopted this guidance with this Quarterly Report, and the impact was not material. Other provisions of ASU 2010-06 were adopted in 2010. See Note B for more discussion of our fair value measurements.

B. FAIR VALUE MEASUREMENTS

Determining Fair Value - We define fair value as the price that would be received from the sale of an asset or the transfer of a liability in an orderly transaction between market participants at the measurement date. We use the market and income approaches to determine the fair value of our assets and liabilities and consider the markets in which the transactions are executed. While many of the contracts in our portfolio are executed in liquid markets where price transparency exists, some contracts are executed in markets for which market prices may exist, but the market may be relatively inactive. This results in limited price transparency that requires management’s judgment and assumptions to estimate fair values. Inputs into our fair value estimates include commodity exchange prices, over-the-counter quotes, volatility, historical correlations of pricing data and LIBOR, and other liquid money market instrument rates. We also utilize internally developed basis curves that incorporate observable and unobservable market data. We validate our valuation inputs with third-party information and settlement prices from other sources, where available. In addition, as prescribed by the income approach, we compute the fair value of our derivative portfolio by discounting the projected future cash flows from our derivative assets and liabilities to present value using interest-rate yields to calculate present-value discount factors derived from LIBOR, Eurodollar futures and interest-rate swaps. We also take into consideration the potential impact on market prices of liquidating positions in an orderly manner over a reasonable period of time under current market conditions. We consider current market data in evaluating counterparties’, as well as our own, nonperformance risk, net of collateral, by using specific and sector bond yields and also monitoring the credit default swap markets. Although we use our best estimates to determine the fair value of the derivative contracts we have executed, the ultimate market prices realized could differ from our estimates, and the differences could be material.

Table of Contents

Recurring Fair Value Measurements - The following tables set forth our recurring fair value measurements for the periods indicated:

	March 31, 2011
	Level 1			Level 2			Level 3			Netting			Total
Assets	(Thousands of dollars)
Derivatives (a)
Commodity contracts
Financial contracts	$	52,840		$	1,246		$	144,725		$	-		$	198,811
Physical contracts		-			8,793			11,974			-			20,767
Netting		-			-			-			(161,432	)		(161,432	)
Total derivatives		52,840			10,039			156,699			(161,432	)		58,146
Trading securities (b)		7,115			-			-			-			7,115
Available-for-sale investment securities (c)		2,412			-			-			-			2,412
Total assets	$	62,367		$	10,039		$	156,699		$	(161,432	)	$	67,673

Liabilities
Derivatives (a)
Commodity contracts
Financial contracts	$	(55,570	)	$	(15,912	)	$	(121,996	)	$	-		$	(193,478	)
Physical contracts		-			(3,600	)		(4,088	)		-			(7,688	)
Netting		-			-			-			143,889			143,889
Total derivatives		(55,570	)		(19,512	)		(126,084	)		143,889			(57,277	)
Fair value of firm commitments (d)		-			-			(28,991	)		-			(28,991	)
Total liabilities	$	(55,570	)	$	(19,512	)	$	(155,075	)	$	143,889		$	(86,268	)
(a) - Included in our Consolidated Balance Sheets as energy marketing and risk management assets and liabilities on a net basis. We net derivative assets and liabilities, including cash collateral, when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At March 31, 2011, we held $17.5 million of cash collateral.
(b) - Included in our Consolidated Balance Sheets as other current assets.
(c) - Included in our Consolidated Balance Sheets as other assets.
(d) - Included in our Consolidated Balance Sheets as other current liabilities and other deferred credits.

Table of Contents

	December 31, 2010
	Level 1			Level 2			Level 3			Netting			Total
Assets	(Thousands of dollars)
Derivatives (a)
Commodity contracts
Financial contracts	$	127,789		$	1,755		$	152,639		$	-		$	282,183
Physical contracts		-			13,185			20,391			-			33,576
Netting		-			-			-			(251,898	)		(251,898	)
Total derivatives		127,789			14,940			173,030			(251,898	)		63,861
Trading securities (b)		7,591			-			-			-			7,591
Available-for-sale investment securities (c)		2,574			-			-			-			2,574
Total assets	$	137,954		$	14,940		$	173,030		$	(251,898	)	$	74,026

Liabilities
Derivatives (a)
Commodity contracts
Financial contracts	$	(64,768	)	$	(3,241	)	$	(119,430	)	$	-		$	(187,439	)
Physical contracts		-			(3,763	)		(4,334	)		-			(8,097	)
Netting		-			-			-			170,515			170,515
Total derivatives		(64,768	)		(7,004	)		(123,764	)		170,515			(25,021	)
Fair value of firm commitments (d)		-			-			(29,536	)		-			(29,536	)
Total liabilities	$	(64,768	)	$	(7,004	)	$	(153,300	)	$	170,515		$	(54,557	)
(a) - Included in our Consolidated Balance Sheets as energy marketing and risk management assets and liabilities on a net basis. We net derivative assets and liabilities, including cash collateral, when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2010, we held $82.5 million of cash collateral and had posted $1.1 million of cash collateral with various counterparties.
(b) - Included in our Consolidated Balance Sheets as other current assets.
(c) - Included in our Consolidated Balance Sheets as other assets.
(d) - Included in our Consolidated Balance Sheets as other current liabilities and other deferred credits.

Our Level 1 fair value measurements are based on NYMEX-settled prices and actively quoted prices for equity securities. These balances are predominantly comprised of exchange-traded derivative contracts, including futures and certain options for natural gas and crude oil, which are valued based on unadjusted quoted prices in active markets. Also included in Level 1 are equity securities.

Our Level 2 fair value inputs are based on NYMEX-settled prices for natural gas and crude oil that are utilized to determine the fair value of certain non-exchange-traded financial instruments, including natural gas and crude oil swaps, as well as physical forwards.

Our Level 3 inputs include internally developed basis curves incorporating observable and unobservable market data, NGL price curves from a pricing service, historical correlations of NGL product prices to published NYMEX crude oil prices, market volatilities derived from the most recent NYMEX close spot prices and forward LIBOR curves, and adjustments for the credit risk of our counterparties. We corroborate the data on which our fair value estimates are based using our market knowledge of recent transactions, analysis of historical correlations and validation with independent broker quotes or a pricing service. The derivatives categorized as Level 3 include natural gas basis swaps, swing swaps, options, other commodity swaps and physical forward contracts. Also included in Level 3 are the fair values of firm commitments. We do not believe that our Level 3 fair value estimates have a material impact on our results of operations, as the majority of our derivatives are accounted for as hedges for which ineffectiveness is not material.

Table of Contents

The following tables set forth the reconciliation of our Level 3 fair value measurements for the periods indicated:

	Derivative Assets (Liabilities)			Fair Value of Firm Commitments			Total
	(Thousands of dollars)
January 1, 2011	$	49,266		$	(29,536	)	$	19,730
Total realized/unrealized gains (losses):
Included in earnings (a)		(7,696	)		545			(7,151	)
Included in other comprehensive income (loss)		(9,855	)		-			(9,855	)
Transfers into Level 3		6			-			6
Transfers out of Level 3		(1,106	)		-			(1,106	)
March 31, 2011	$	30,615		$	(28,991	)	$	1,624

Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held as of March 31, 2011 (a)	$	2,878		$	(4,191	)	$	(1,313	)
(a) - Reported in revenues and cost of sales and fuel in our Consolidated Statements of Income.

	Derivative Assets (Liabilities)			Fair Value of Firm Commitments			Total
	(Thousands of dollars)
January 1, 2010	$	136,694		$	(134,620	)	$	2,074
Total realized/unrealized gains (losses):
Included in earnings (a)		(4,496	)		23,023			18,527
Included in other comprehensive income (loss)		13,222			-			13,222
Transfers into Level 3		1,468			-			1,468
Transfers out of Level 3		685			-			685
March 31, 2010	$	147,573		$	(111,597	)	$	35,976

Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held as of March 31, 2010 (a)	$	18,458		$	(7,046	)	$	11,412
(a) - Reported in revenues and cost of sales and fuel in our Consolidated Statements of Income.

Realized/unrealized gains (losses) include the realization of our derivative contracts through maturity and changes in fair value of our hedged firm commitments. We recognize transfers into and out of Level 3 as of the end of each reporting period. Transfers into Level 3 represent existing assets or liabilities that were previously categorized at a higher level for which the unobservable inputs became a more significant portion of the fair value estimates. Transfers out of Level 3 represent existing assets and liabilities that were classified previously as Level 3 for which the observable inputs became a more significant portion of the fair value estimates.

Other Financial Instruments - The approximate fair value of cash and cash equivalents, accounts receivable, accounts payable and notes payable is equal to book value, due to the short-term nature of these items.

The estimated fair value of long-term debt, including current maturities, was $5.7 billion at March 31, 2011, and $4.7 billion at December 31, 2010. The book value of long-term debt, including current maturities, was $5.4 billion and $4.3 billion at March 31, 2011, and December 31, 2010, respectively. The estimated fair value of long-term debt has been determined using quoted market prices of ONEOK’s and ONEOK Partners’ senior notes or similar issues with similar terms and maturities.

Table of Contents

C. RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

Our Energy Services and ONEOK Partners segments are exposed to various risks that we manage by periodically entering into derivative instruments. These risks include the following:

Commodity price risk - We are exposed to the risk of loss in cash flows and future earnings arising from adverse changes in the price of natural gas, NGLs and crude oil. We use commodity derivative instruments such as futures, physical forward contracts, swaps and options to reduce the commodity price risk associated with a portion of the forecasted purchases and sales of commodities and natural gas and natural gas liquids in storage. Commodity price volatility may have a significant impact on the fair value of our derivative instruments as of a given date;

Basis risk - We are exposed to the risk of loss in cash flows and future earnings arising from adverse changes in the price differentials between pipeline receipt and delivery locations. Our firm transportation capacity allows us to purchase natural gas at a pipeline receipt point and sell natural gas at a pipeline delivery point. Our Energy Services segment periodically enters into basis swaps between the transportation receipt and delivery points in order to protect the fair value of these location price differentials related to our firm commitments; and

Currency exchange rate risk - As a result of our Energy Services segment’s activities in Canada, we are exposed to the risk of loss in cash flows and future earnings from adverse changes in currency exchange rates on our commodity purchases and sales, primarily related to our firm transportation and storage contracts that are transacted in a currency other than our functional currency, the United States dollar. To reduce our exposure to exchange-rate fluctuations, we use physical forward transactions, which result in an actual two-way flow of currency on the settlement date in which we exchange United States dollars for Canadian dollars with another party.

The following derivative instruments are used to manage our exposure to these risks:

·	Futures contracts - Standardized exchange-traded contracts to purchase or sell natural gas and crude oil at a specified price, requiring delivery on or settlement through the sale or purchase of an offsetting contract by a specified future date under the provisions of exchange regulations;

Forward contracts - Commitments to purchase or sell natural gas, crude oil or NGLs for physical delivery at some specified time in the future. We also use currency forward contracts to manage our currency exchange rate risk. Forward contracts are different from futures in that forwards are customized and non-exchange traded;

Swaps - Financial trades involving the exchange of payments based on two different pricing structures for a commodity. In a typical commodity swap, parties exchange payments based on changes in the price of a commodity or a market index, while fixing the price they effectively pay or receive for the physical commodity. As a result, one party assumes the risks and benefits of movements in market prices, while the other party assumes the risks and benefits of a fixed price for the commodity; and

·	Options - Contractual agreements that give the holder the right, but not the obligation, to buy or sell a fixed quantity of a commodity, at a fixed price, within a specified period of time. Options may either be standardized and exchange traded or customized and non-exchange traded.

Our objectives for entering into such contracts include but are not limited to:

·	reducing the variability of cash flows by locking in the price for all or a portion of anticipated index-based physical purchases and sales, transportation fuel requirements, asset management transactions and customer-related business activities;

·	locking in a price differential to protect the fair value between transportation receipt and delivery points and to protect the fair value of natural gas or NGLs that are purchased in one month and sold in a later month; and

·	reducing our exposure to fluctuations in foreign currency exchange rates.

Our Energy Services segment also enters into derivative contracts for financial trading purposes primarily to capitalize on opportunities created by market volatility, weather-related events, supply-demand imbalances and market liquidity inefficiencies, which allow us to capture additional margin. Financial trading activities are executed generally using financially settled derivatives and are normally short term in nature.

With respect to the net open positions that exist within our marketing and financial trading operations, fluctuating commodity prices can impact our financial position and results of operations. The net open positions are actively managed, and the impact of the changing prices on our financial condition at a point in time is not necessarily indicative of the impact of price movements throughout the year.

Our Distribution segment also uses derivative instruments to hedge the cost of anticipated natural gas purchases during the winter heating months to protect our customers from upward volatility in the market price of natural gas. The use of these

Table of Contents

derivative instruments and the associated recovery of these costs have been approved by the OCC, KCC and regulatory authorities in certain of our Texas jurisdictions.

We are also subject to fluctuation in interest rates. We manage interest-rate risk through the use of fixed-rate debt, floating-rate debt and interest-rate swaps. Interest-rate swaps are agreements to exchange an interest payment at some future point based on the differential between two interest rates. At March 31, 2011, and December 31, 2010, we did not have any interest-rate swap agreements.

Accounting Treatment

We record all derivative instruments at fair value, with the exception of normal purchases and normal sales that are expected to result in physical delivery. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, the reason for holding it.

If certain conditions are met, we may elect to designate a derivative instrument as a hedge of exposure to changes in fair values, cash flows or foreign currency. Certain non-trading derivative transactions, which are economic hedges of our accrual transactions, such as our storage and transportation contracts, do not qualify for hedge accounting treatment.

The table below summarizes the various ways in which we account for our derivative instruments and the impact on our consolidated financial statements:

		Recognition and Measurement
Accounting Treatment		Balance Sheet		Income Statement
Normal purchases and normal sales	-	Fair value not recorded	-	Change in fair value not recognized in earnings
Mark-to-market	-	Recorded at fair value	-	Change in fair value recognized in earnings
Cash flow hedge	-	Recorded at fair value	-	Ineffective portion of the gain or loss on the derivative instrument is recognized in earnings
	-	Effective portion of the gain or loss on the derivative instrument is reported initially as a component of accumulated other comprehensive income (loss)	-	Effective portion of the gain or loss on the derivative instrument is reclassified out of accumulated other comprehensive income (loss) into earnings when the forecasted transaction affects earnings
Fair value hedge	-	Recorded at fair value	-	The gain or loss on the derivative instrument is recognized in earnings
	-	Change in fair value of the hedged item is recorded as an adjustment to book value	-	Change in fair value of the hedged item is recognized in earnings

Gains or losses associated with the fair value of derivative instruments entered into by our Distribution segment are included in, and recoverable through, the monthly purchased-gas cost mechanism.

We formally document all relationships between hedging instruments and hedged items, as well as risk management objectives, strategies for undertaking various hedge transactions and methods for assessing and testing correlation and hedge ineffectiveness. We specifically identify the asset, liability, firm commitment or forecasted transaction that has been designated as the hedged item. We assess the effectiveness of hedging relationships quarterly by performing an effectiveness analysis on our cash flow and fair value hedging relationships to determine whether the hedge relationships are highly effective on a retrospective and prospective basis. We also document our normal purchases and normal sales transactions that we expect to result in physical delivery and that we elect to exempt from derivative accounting treatment.

The presentation of settled derivative instruments on either a gross or net basis in our Consolidated Statements of Income is dependent on the relevant facts and circumstances of our different types of activities rather than based solely on the terms of the individual contracts. All financially settled derivative instruments, as well as derivative instruments considered held for trading purposes that result in physical delivery, are reported on a net basis in revenues in our Consolidated Statements of Income. The realized revenues and purchase costs of derivative instruments that are not considered held for trading purposes and non-derivative contracts are reported on a gross basis. Derivatives that qualify as normal purchases or normal sales that are expected to result in physical delivery are also reported on a gross basis.

Revenues in our Consolidated Statements of Income include financial trading margins, as well as certain physical natural gas transactions with our trading counterparties. Revenues and cost of sales and fuel from such physical transactions are reported on a net basis.

Table of Contents

Cash flows from futures, forwards, options and swaps that are accounted for as hedges are included in the same Consolidated Statements of Cash Flows category as the cash flows from the related hedged items.

Fair Values of Derivative Instruments - The following table sets forth the fair values of our derivative instruments for the periods indicated:

	March 31, 2011					December 31, 2010
	Fair Values of Derivatives (a)					Fair Values of Derivatives (a)
	Assets		(Liabilities)			Assets			(Liabilities)
	(Thousands of dollars)
Derivatives designated as hedging instruments
Commodity contracts
Financial contracts	$	57,740	$	(43,467	)	$	136,040	(b)	$	(23,843	)
Physical contracts		29		(278	)		-			(883	)
Total derivatives designated as hedging instruments		57,769		(43,745	)		136,040			(24,726	)
Derivatives not designated as hedging instruments
Commodity contracts
Non-trading instruments
Financial contracts		119,994		(131,303	)		125,503			(144,940	)
Physical contracts		20,738		(7,410	)		33,576			(7,214	)
Trading instruments
Financial contracts		21,077		(18,708	)		20,640			(18,656	)
Total derivatives not designated as hedging instruments		161,809		(157,421	)		179,719			(170,810	)
Total derivatives	$	219,578	$	(201,166	)	$	315,759		$	(195,536	)
(a) - Included on a net basis in energy marketing and risk management assets and liabilities on our Consolidated Balance Sheets.
(b) - Includes $44.9 million of derivative assets associated with cash flow hedges of inventory that were adjusted to reflect the lower of cost or market value. The deferred gains associated with these assets have been reclassified from accumulated other comprehensive loss.

Notional Quantities for Derivative Instruments - The following table sets forth the notional quantities for derivative instruments held for the periods indicated:

					March 31, 2011		December 31, 2010
				Contract Type	Purchased/ Payor	Sold/ Receiver	Purchased/ Payor	Sold/ Receiver
Derivatives designated as hedging instruments:
	Cash flow hedges
		Fixed price
			- Natural gas (Bcf)	Exchange futures	1.1	(6.2)	0.4	(7.6)
				Swaps	1.7	(34.4)	3.0	(69.9)
			- Crude oil and NGLs (MMBbl)	Swaps	-	(3.1)	-	(1.5)
		Basis
			- Natural gas (Bcf)	Forwards and swaps	2.5	(29.6)	2.8	(64.9)
	Fair value hedges
		Basis
			- Natural gas (Bcf)	Forwards and swaps	124.6	(124.6)	141.1	(141.1)

Derivatives not designated as hedging instruments:
		Fixed price
			- Natural gas (Bcf)	Exchange futures	22.4	(14.7)	34.6	(20.6)
				Forwards and swaps	87.8	(110.6)	73.6	(100.3)
				Options	166.9	(122.0)	81.0	(74.3)
			- Crude and NGLs (MMBbl)	Forwards and swaps	0.3	(0.3)	0.6	(0.6)
		Basis
			- Natural gas (Bcf)	Forwards and swaps	354.4	(382.9)	411.5	(419.7)
		Index
			- Natural gas (Bcf)	Forwards and swaps	44.1	(7.8)	33.6	(6.1)

These notional amounts are used to summarize the volume of financial instruments; however, they do not reflect the extent to which the positions offset one another and consequently do not reflect our actual exposure to market or credit risk.

Table of Contents

Cash Flow Hedges - Our Energy Services and ONEOK Partners segments use derivative instruments to hedge the cash flows associated with anticipated purchases and sales of natural gas, NGLs and condensate and cost of fuel used in the transportation of natural gas. Accumulated other comprehensive income (loss) at March 31, 2011, includes losses of approximately $3.8 million, net of tax, related to these hedges that will be recognized within the next 21 months as the forecasted transactions affect earnings. If prices remain at current levels, we will recognize $2.4 million in net losses over the next 12 months, and we will recognize net losses of $1.4 million thereafter.

For the three months ended March 31, 2010, cost of sales and fuel in our Consolidated Statements of Income includes $11.3 million, reflecting an adjustment to natural gas inventory at the lower of cost or market value. We reclassified this amount of deferred gains, before income taxes, on associated cash flow hedges from accumulated other comprehensive income (loss) into earnings in 2010. For the three months ended March 31, 2011, we did not have an adjustment to natural gas in inventory at the lower of cost or market.

The following table sets forth the effect of cash flow hedges on our Consolidated Statements of Income for the periods indicated:

	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Net Income (Effective Portion)		Three Months Ended
Derivatives in Cash Flow			March 31,
Hedging Relationships			2011			2010
			(Thousands of dollars)
Commodity contracts	Revenues	$	33,387		$	29,956
Commodity contracts	Cost of sales and fuel		(828	)		(12,097	)
Interest rate contracts	Interest expense		(208	)		221
Total gain (loss) reclassified from accumulated other comprehensive income
(loss) into net income on derivatives (effective portion)		$	32,351		$	18,080

Ineffectiveness related to our cash flow hedges was not material for the three months ended March 31, 2011 and 2010. In the event that it becomes probable that a forecasted transaction will not occur, we will discontinue cash flow hedge treatment, which will affect earnings. For the three months ended March 31, 2011 and 2010, there were no gains or losses due to the discontinuance of cash flow hedge treatment since the underlying transactions were no longer probable.

Other Derivative Instruments - The following table sets forth the effect of our derivative instruments that are not part of a hedging relationship on our Consolidated Statements of Income for the period indicated:

		Three Months Ended
Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss)	March 31,
Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss)	2011		2010
		(Thousands of dollars)
Commodity contracts - trading	Revenues	$	406	$	2,028
Commodity contracts - non-trading (a)	Cost of sales and fuel		2,548		(41	)
Foreign exchange contracts	Revenues		-		59
Total gain recognized in income on derivatives		$	2,954	$	2,046
(a) - Amounts are presented net of deferred losses associated with derivatives entered into by
our Distribution segment.

Our Distribution segment did not hold any derivative instruments at March 31, 2011, and held natural gas call options with premiums totaling $16.7 million at December 31, 2010. The premiums are recorded in other current assets as these contracts are included in, and recoverable through, the monthly purchased-gas cost mechanism. For the three months ended March 31, 2011 and 2010, we recognized $1.3 million and $3.9 million, respectively, of losses associated with the decline in value and expiration of option contracts, which were deferred as part of our unrecognized purchased gas costs.

Fair Value Hedges - In prior years, we terminated various interest-rate swap agreements. The net savings from the termination of these swaps is being recognized in interest expense over the terms of the debt instruments originally hedged. Interest expense savings from the amortization of terminated swaps for the three months ended March 31, 2011 and 2010, were $2.5 million in each period.

Our Energy Services segment uses basis swaps to hedge the fair value of location price differentials related to certain firm transportation commitments. Cost of sales and fuel in our Consolidated Statements of Income include gains of $5.4 million and $10.8 million for the three months ended March 31, 2011 and 2010, respectively, related to the change in fair value of derivatives designated as fair value hedges. This includes gains of $0.4 million and $1.3 million for the three months ended

Table of Contents

March 31, 2011 and 2010, respectively, related to the ineffectiveness of these hedges. Revenues include losses of $5.0 million and $9.6 million for the three months ended March 31, 2011 and 2010, respectively, to recognize the change in fair value of the related hedged firm commitments.

Credit Risk - We monitor the creditworthiness of our counterparties and compliance with policies and limits established by our Risk Oversight and Strategy Committee. We maintain credit policies with regard to our counterparties that we believe minimize overall credit risk. These policies include an evaluation of potential counterparties’ financial condition (including credit ratings, bond yields and credit default swap rates), collateral requirements under certain circumstances and the use of standardized master-netting agreements that allow us to net the positive and negative exposures associated with a single counterparty. We have counterparties whose credit is not rated, and for those customers we use internally developed credit ratings.

Some of our derivative instruments contain provisions that require us to maintain an investment-grade credit rating from S&P and/or Moody’s. If our credit ratings on senior unsecured long-term debt were to decline below investment grade, we would be in violation of these provisions, and the counterparties to the derivative instruments could request collateralization on derivative instruments in net liability positions. The aggregate fair value of all financial derivative instruments with contingent features related to credit risk that were in a net liability position as of March 31, 2011, was $25.7 million. If the contingent features underlying these agreements were triggered on March 31, 2011, we would have been required to post the entire $25.7 million of collateral to our counterparties.

The counterparties to our derivative contracts consist primarily of major energy companies, LDCs, electric utilities, financial institutions and commercial and industrial end-users. This concentration of counterparties may impact our overall exposure to credit risk, either positively or negatively, in that the counterparties may be similarly affected by changes in economic, regulatory or other conditions. Based on our policies, exposures, credit and other reserves, we do not anticipate a material adverse effect on our financial position or results of operations as a result of counterparty nonperformance.

The following tables set forth the net credit exposure from our derivative assets for the periods indicated:

	March 31, 2011
	Investment		Non-investment		Not
	Grade		Grade		Rated		Total
Counterparty sector	(Thousands of dollars)
Gas and electric utilities	$	13,713	$	1,319	$	117	$	15,149
Oil and gas		16,341		-		240		16,581
Industrial		-		-		2,704		2,704
Financial		23,710		-		-		23,710
Other		-		-		2		2
Total	$	53,764	$	1,319	$	3,063	$	58,146

	December 31, 2010
	Investment		Non-investment		Not
	Grade		Grade		Rated		Total
Counterparty sector	(Thousands of dollars)
Gas and electric utilities	$	33,847	$	1,240	$	678	$	35,765
Oil and gas		8,995		35		2,091		11,121
Industrial		18		-		7,682		7,700
Financial		9,254		-		-		9,254
Other		-		-		21		21
Total	$	52,114	$	1,275	$	10,472	$	63,861

Table of Contents

D. CREDIT FACILITIES AND SHORT-TERM NOTES PAYABLE

ONEOK 2011 Credit Agreement - On April 5, 2011, ONEOK entered into the ONEOK 2011 Credit Agreement, which replaced the ONEOK Credit Agreement. Under the ONEOK 2011 Credit Agreement, which is scheduled to expire in April 2016, ONEOK is required to comply with certain financial, operational and legal covenants. Among other things, these requirements include:

·	a limitation on ONEOK’s stand-alone debt-to-capital ratio, which may not exceed 67.5 percent at the end of any calendar quarter;

·	limitations on the ratio of indebtedness secured by liens and indebtedness of subsidiaries to consolidated net tangible assets;

·	a requirement that ONEOK maintains the power to control the management and policies of ONEOK Partners; and

·	a limit on new investments in master limited partnerships.

The ONEOK 2011 Credit Agreement also contains customary affirmative and negative covenants, including covenants relating to liens, investments, fundamental changes in the nature of ONEOK’s businesses, transactions with affiliates, the use of proceeds and a covenant that limits ONEOK’s ability to restrict its subsidiaries’ ability to pay dividends. Under the terms of the ONEOK 2011 Credit Agreement, ONEOK may request an increase in the size of the facility to an aggregate of $1.7 billion by either commitments from new lenders or increased commitments from existing lenders.

The debt covenant calculations in the ONEOK 2011 Credit Agreement exclude the debt of ONEOK Partners. Upon breach of certain covenants by ONEOK, amounts outstanding under the ONEOK 2011 Credit Agreement may become due and payable immediately.

Under the ONEOK Credit Agreement, ONEOK’s stand-alone debt-to-capital ratio may not exceed 67.5 percent at the end of any calendar quarter. At March 31, 2011, ONEOK’s stand-alone debt-to-capital ratio, as defined by the ONEOK Credit Agreement, was 36.7 percent, and ONEOK was in compliance with all covenants under the ONEOK Credit Agreement.

At March 31, 2011, ONEOK had no commercial paper outstanding and $2.0 million in letters of credit issued under the ONEOK Credit Agreement, leaving approximately $1.2 billion of credit available under the ONEOK Credit Agreement.

ONEOK Partners Credit Agreement - Under the ONEOK Partners Credit Agreement, which expires March 2012, ONEOK Partners is required to comply with certain financial, operational and legal covenants. Among other things, these requirements include maintaining a ratio of indebtedness to adjusted EBITDA (EBITDA, as defined in the ONEOK Partners Credit Agreement, adjusted for all non-cash charges and increased for projected EBITDA from certain lender-approved capital expansion projects) of no more than 5 to 1. If ONEOK Partners consummates one or more acquisitions in which the aggregate purchase price is $25 million or more, the allowable ratio of indebtedness to adjusted EBITDA will increase to 5.5 to 1 for the three calendar quarters following the acquisitions. Upon breach of certain covenants by ONEOK Partners in its credit agreement, amounts outstanding under the ONEOK Partners Credit Agreement may become due and payable immediately. At March 31, 2011, ONEOK Partners’ ratio of indebtedness to adjusted EBITDA was 4.17 to 1, and ONEOK Partners was in compliance with all covenants under the ONEOK Partners Credit Agreement.

A portion of the proceeds from ONEOK Partners’ January 2011 debt issuance, as discussed in Note E, was used to repay the outstanding balance of its commercial paper. At March 31, 2011, ONEOK Partners had no commercial paper outstanding and no borrowings outstanding under the ONEOK Partners Credit Agreement. As a result of ONEOK Partners’ January 2011 debt issuance, its available borrowings are limited by the ratio of indebtedness to adjusted EBITDA covenant under the ONEOK Partners Credit Agreement; however, ONEOK Partners had approximately $617.4 million of cash at March 31, 2011, and $772.0 million of available borrowings to meet its liquidity needs.

At March 31, 2011, ONEOK Partners had no letters of credit issued outside of the ONEOK Partners Credit Agreement. Borrowings under the ONEOK Partners Credit Agreement are nonrecourse to ONEOK.

Neither ONEOK nor ONEOK Partners guarantees the debt or other similar commitments to unaffiliated parties, and ONEOK does not guarantee the debt or other similar commitments of ONEOK Partners.

Table of Contents

E. LONG-TERM DEBT

In January 2011, ONEOK Partners completed an underwritten public offering of $1.3 billion of senior notes, consisting of $650 million of 3.25-percent senior notes due 2016 and $650 million of 6.125-percent senior notes due 2041. The net proceeds from the offering of approximately $1.28 billion were used to repay amounts outstanding under ONEOK Partners’ commercial paper program, to repay the $225 million of ONEOK Partners’ senior notes that matured in March 2011 and for general partnership purposes, including capital expenditures.

These notes are governed by an indenture, dated as of September 25, 2006, between ONEOK Partners and Wells Fargo Bank, N.A., the trustee, as supplemented. The indenture does not limit the aggregate principal amount of debt securities that may be issued and provides that debt securities may be issued from time to time in one or more additional series. The indenture contains covenants including, among other provisions, limitations on ONEOK Partners’ ability to place liens on its property or assets and to sell and lease back its property. The indenture includes an event of default upon acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of any of ONEOK Partners’ outstanding senior notes to declare those notes immediately due and payable in full.

ONEOK Partners may redeem its 3.25-percent senior notes due 2016 and its 6.125-percent senior notes due 2041 at par starting one month and six months, respectively, before their maturities. Prior to these dates, ONEOK Partners may redeem these notes, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium. The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date. The senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners’ existing and future unsecured senior indebtedness, and structurally subordinate to any of the existing and future debt and other liabilities of any non-guarantor subsidiaries.

In April 2011, ONEOK repaid $400 million of maturing senior notes with available cash and short-term borrowings.

F. EQUITY

The following tables set forth the changes in equity attributable to us and our noncontrolling interests, including other comprehensive income, net of tax, for the periods indicated:

	Three Months Ended									Three Months Ended
	March 31, 2011									March 31, 2010
	ONEOK Shareholders' Equity			Noncontrolling Interests in Consolidated Subsidiaries			Total Equity			ONEOK Shareholders' Equity			Noncontrolling Interests in Consolidated Subsidiaries			Total Equity
	(Thousands of dollars)
Beginning balance	$	2,448,623		$	1,472,218		$	3,920,841		$	2,207,194		$	1,238,268		$	3,445,462
Net income		130,130			69,216			199,346			154,539			32,181			186,720
Other comprehensive income		(26,335	)		(15,459	)		(41,794	)		13,049			16,287			29,336
Repurchase of common stock		(48	)		-			(48	)		(5	)		-			(5	)
Common stock issued		2,365			-			2,365			1,890			-			1,890
Common stock dividends		(55,651	)		-			(55,651	)		(46,701	)		-			(46,701	)
Issuance of common units of ONEOK Partners		-			-			-			50,731			271,990			322,721
Distributions to noncontrolling interests		-			(68,041	)		(68,041	)		-			(59,782	)		(59,782	)
Ending balance	$	2,499,084		$	1,457,934		$	3,957,018		$	2,380,697		$	1,498,944		$	3,879,641

Dividends - Fourth-quarter 2010 and first-quarter 2011 dividends paid on our common stock to shareholders of record at the close of business on January 31, 2011, and April 29, 2011, respectively, were $0.52 per share for each period.

See Note K for a discussion of ONEOK Partners’ distributions to noncontrolling interests.

Table of Contents

G. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table sets forth the balance of accumulated other comprehensive income (loss) for the periods indicated:

	Unrealized Gains (Losses) on Energy Marketing and Risk Management Assets/Liabilities		Unrealized Holding Gains (Losses) on Investment Securities		Pension and Postretirement Benefit Plan Obligations		Accumulated Other Comprehensive Income (Loss)
		(Thousands of dollars)
December 31, 2010	$	15,731	$	1,371	$	(125,904)	$	(108,802)
Other comprehensive income (loss) attributable to ONEOK		(21,563)		(99)		(4,673)		(26,335)
March 31, 2011	$	(5,832)	$	1,272	$	(130,577)	$	(135,137)

H. EARNINGS PER SHARE

The following tables set forth the computation of basic and diluted EPS from continuing operations for the periods indicated:

	Three Months Ended March 31, 2011
					Per Share
	Income		Shares		Amount
	(Thousands, except per share amounts)
Basic EPS from continuing operations
Net income attributable to ONEOK available for common stock	$	130,130		107,020	$	1.22
Diluted EPS from continuing operations
Effect of options and other dilutive securities		-		2,159
Net income attributable to ONEOK available for common stock
and common stock equivalents	$	130,130		109,179	$	1.19

	Three Months Ended March 31, 2010
					Per Share
	Income		Shares		Amount
	(Thousands, except per share amounts)
Basic EPS from continuing operations
Net income attributable to ONEOK available for common stock	$	154,539		106,132	$	1.46
Diluted EPS from continuing operations
Effect of options and other dilutive securities		-		1,278
Net income attributable to ONEOK available for common stock
and common stock equivalents	$	154,539		107,410	$	1.44

There were no option shares excluded from the calculation of diluted EPS for the three months ended March 31, 2011 and 2010.

Table of Contents

I. EMPLOYEE BENEFIT PLANS

The following table sets forth the components of net periodic benefit cost for our pension and postretirement benefit plans for the periods indicated:

	Pension Benefits						Postretirement Benefits
	Three Months Ended						Three Months Ended
	March 31,						March 31,
	2011			2010			2011			2010
	(Thousands of dollars)
Components of net periodic benefit cost	(Thousands of dollars)
Service cost	$	5,003		$	4,819		$	1,260		$	1,231
Interest cost		14,689			14,536			3,958			3,911
Expected return on assets		(18,875	)		(18,413	)		(2,568	)		(1,974	)
Amortization of unrecognized net asset at adoption		-			-			797			797
Amortization of unrecognized prior service cost		254			320			(501	)		(501	)
Amortization of net loss		8,928			6,889			2,031			1,752
Net periodic benefit cost	$	9,999		$	8,151		$	4,977		$	5,216

J. UNCONSOLIDATED AFFILIATES

Northern Border Pipeline - Northern Border Pipeline anticipates requiring additional equity contributions of approximately $100 million to $120 million from its partners in 2011, of which ONEOK Partners’ share will be approximately $50 million to $60 million based on its 50-percent equity interest.

Overland Pass Pipeline Company - In 2011 and 2012, ONEOK Partners expects to make contributions totaling approximately $35 million to $40 million to Overland Pass Pipeline Company to install additional pump stations and to expand existing pump stations.

Equity Earnings from Investments - The following table sets forth our equity earnings from investments for the periods indicated. All amounts in the table below are equity earnings from investments in our ONEOK Partners segment:

	Three Months Ended
	March 31,
	2011		2010
	(Thousands of dollars)
Northern Border Pipeline	$	20,852	$	14,846
Overland Pass Pipeline Company		4,376		-
Fort Union Gas Gathering, L.L.C.		2,965		3,558
Bighorn Gas Gathering, L.L.C.		1,493		237
Lost Creek Gathering Company, L.L.C.		417		1,402
Other		1,989		1,073
Equity earnings from investments	$	32,092	$	21,116

Unconsolidated Affiliates Financial Information - The following table sets forth summarized combined financial information of our unconsolidated affiliates for the periods indicated:

	Three Months Ended
	March 31,
	2011		2010
	(Thousands of dollars)
Income Statement (a)
Operating revenues	$	123,301	$	99,231
Operating expenses	$	54,236	$	44,715
Net income	$	63,165	$	46,911

Distributions paid to us	$	32,511	$	23,529
(a) - Financial information for 2011 is not directly comparable with 2010 due to the deconsolidation of Overland Pass Pipeline Company in September 2010.

Table of Contents

K. ONEOK PARTNERS

Ownership Interest in ONEOK Partners - Our ownership interest in ONEOK Partners is shown in the table below as of March 31, 2011, and December 31, 2010:


General partner interest		2.0%
Limited partner interest (a)		40.8%
Total ownership interest		42.8%
(a) - Represents 5.9 million common units and approximately 36.5 million Class B units, which are convertible, at our option, into common units.

Cash Distributions - We receive distributions from ONEOK Partners on our common and Class B units and our 2-percent general partner interest, which includes our incentive distribution rights. The following table shows ONEOK Partners’ distributions paid in the periods indicated:

	Three Months Ended
	March 31,
	2011		2010
	(Thousands, except per unit amounts)
Distribution per unit	$	1.14	$	1.10

General partner distributions	$	2,956	$	2,642
Incentive distributions		28,645		23,397
Distributions to general partner		31,601		26,039
Limited partner distributions to ONEOK		48,329		46,634
Limited partner distributions to noncontrolling interest		67,846		59,413
Total distributions paid	$	147,776	$	132,086

The following table shows ONEOK Partners’ distributions declared for the periods indicated and paid within 45 days of the end of the period:

	Three Months Ended
	March 31,
	2011		2010
	(Thousands, except per unit amounts)
Distribution per unit	$	1.15	$	1.11

General partner distributions	$	2,996	$	2,833
Incentive distributions		29,624		25,710
Distributions to general partner		32,620		28,543
Limited partner distributions to ONEOK		48,753		47,057
Limited partner distributions to noncontrolling interest		68,441		66,061
Total distributions declared	$	149,814	$	141,661

Relationship - We consolidate ONEOK Partners in our consolidated financial statements; however, we are restricted from the assets and cash flows of ONEOK Partners except for our distributions. Distributions are declared quarterly by ONEOK Partners’ general partner based on the terms of the ONEOK Partners partnership agreement. See Note M for more information on ONEOK Partners’ results.

Affiliate Transactions - We have certain transactions with ONEOK Partners and its subsidiaries, which comprise our ONEOK Partners segment.

ONEOK Partners sells natural gas from its natural gas gathering and processing operations to our Energy Services segment. In addition, a portion of ONEOK Partners’ revenues from its natural gas pipelines business is from our Energy Services and Distribution segments, which contract with ONEOK Partners for natural gas transportation and storage services. ONEOK Partners also purchases natural gas from our Energy Services segment for its natural gas liquids and its natural gas gathering and processing operations.

Table of Contents

ONEOK Partners has certain contractual rights to the Bushton Plant through a Processing and Services Agreement with us, which sets out the terms for processing and related services we provide at the Bushton Plant through May 2012. ONEOK Partners has contracted for all of the capacity of the Bushton Plant from us. In exchange, ONEOK Partners pays us for all costs and expenses necessary for the operation and maintenance of the Bushton Plant and reimburses us for our obligations under equipment leases covering portions of the Bushton Plant. Pursuant to its rights under the Processing and Services Agreement, on April 22, 2011, ONEOK Partners directed us to exercise our purchase option for the original leased equipment (or any replacement parts) pursuant to the terms of the equipment leases. The Processing and Services Agreement provides that ONEOK Partners will reimburse us for amounts incurred in connection with the exercised option, and upon reimbursement, ONEOK Partners will become the owner of the purchased equipment.

We provide a variety of services to our affiliates, including cash management and financial services, legal and administrative services by our employees and management, insurance and office space leased in our headquarters building and other field locations. Where costs are incurred specifically on behalf of an affiliate, the costs are billed directly to the affiliate by us. In other situations, the costs may be allocated to the affiliates through a variety of methods, depending upon the nature of the expenses and the activities of the affiliates. For example, a service that applies equally to all employees is allocated based upon the number of employees in each affiliate. However, an expense benefiting the consolidated company but having no direct basis for allocation is allocated by the modified Distrigas method, a method using a combination of ratios that include gross plant and investment, operating income and payroll expense. It is not practicable to determine what these general overhead costs would be on a stand-alone basis.

The following table shows ONEOK Partners’ transactions with us for the periods indicated:

	Three Months Ended
	March 31,
	2011		2010
	(Thousands of dollars)
Revenues	$	96,793	$	136,931

Expenses
Cost of sales and fuel	$	10,731	$	17,759
Administrative and general expenses		56,295		51,025
Total expenses	$	67,026	$	68,784

L. COMMITMENTS AND CONTINGENCIES

Environmental Matters - We are subject to multiple historical and wildlife preservation laws and environmental regulations affecting many aspects of our present and future operations. Regulated activities include those involving air emissions, stormwater and wastewater discharges, handling and disposal of solid and hazardous wastes, hazardous materials transportation, and pipeline and facility construction. These laws and regulations require us to obtain and comply with a wide variety of environmental clearances, registrations, licenses, permits and other approvals. Failure to comply with these laws, regulations, permits and licenses may expose us to fines, penalties and/or interruptions in our operations that could be material to our results of operations. If a leak or spill of hazardous substances or petroleum products occurs from pipelines or facilities that we own, operate or otherwise use, we could be held jointly and severally liable for all resulting liabilities, including response, investigation and clean-up costs, which could affect materially our results of operations and cash flows. In addition, emission controls required under the Clean Air Act and other similar federal and state laws could require unexpected capital expenditures at our facilities. We cannot assure that existing environmental regulations will not be revised or that new regulations will not be adopted or become applicable to us. Revised or additional regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition and results of operations.

We own or retain legal responsibility for the environmental conditions at 12 former manufactured gas sites in Kansas. These sites contain potentially harmful materials that are subject to control or remediation under various environmental laws and regulations. A consent agreement with the KDHE presently governs all work at these sites. The terms of the consent agreement allow us to investigate these sites and set remediation activities based upon the results of the investigations and risk analysis. Remediation typically involves the management of contaminated soils and may involve removal of structures and monitoring and/or remediation of groundwater.

Table of Contents

Of the 12 sites, we have begun soil remediation on 11 sites. Regulatory closure has been achieved at three locations, and we have completed or are near completion of soil remediation at eight sites. We have begun site assessment at the remaining site where no active remediation has occurred.

Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position or results of operations, and our expenditures related to environmental matters had no material effects on earnings or cash flows during the three months ended March 31, 2011 or 2010.

In May 2010, the EPA finalized the “Tailoring Rule” that will regulate greenhouse gas emissions at new or modified facilities that meet certain criteria. Affected facilities will be required to review best available control technology, conduct air-quality analysis, impact analysis and public reviews with respect to such emissions. The rule was phased in beginning January 2011 and, at current emission threshold levels, we believe it will have a minimal impact on our existing facilities. The EPA has stated it will consider lowering the threshold levels over the next five years, which could increase the impact on our existing facilities; however, potential costs, fees or expenses associated with the potential adjustments are unknown.

In addition, the EPA issued a rule on air-quality standards, “National Emission Standards for Hazardous Air Pollutants for Reciprocating Internal Combustion Engines,” also known as RICE NESHAP, scheduled to be adopted in early 2013. The rule will require capital expenditures over the next three years for the purchase and installation of new emissions-control equipment. We do not expect these expenditures to have a material impact on our results of operations, financial position or cash flows.

Pipeline Safety - We are subject to Pipeline and Hazardous Materials Safety Administration regulations, including integrity-management regulations. The Pipeline Safety Improvement Act of 2002 requires pipeline companies operating high-pressure pipelines to perform integrity assessments on pipeline segments that pass through densely populated areas or near specifically designated high-consequence areas. Currently, Congress is reauthorizing existing pipeline safety legislation, and there are also a number of new bills addressing pipeline safety being considered. Recently, the Pipeline and Hazardous Materials Safety Administration issued an “Advisory Bulletin” regarding maximum operating pressures for natural gas and hazardous liquids pipelines. This bulletin requests all operators review pipeline records and data to validate existing maximum pressure determinations. We are monitoring activity concerning reauthorization, proposed new legislation and potential changes in the Pipeline and Hazardous Materials Safety Administration’s regulations to assess the potential impact on our operations. At this time, our review of records relating to maximum pressure determinations is ongoing, and no revised or new legislation has been enacted resulting in any potential cost, fees or expenses associated with these issues. We cannot provide assurance that existing pipeline safety regulations will not be revised or interpreted in a different manner or that new regulations will not be adopted that could result in increased compliance costs or additional operating restrictions.

Financial Markets Legislation - The Dodd-Frank Act represents a far-reaching overhaul of the framework for regulation of United States financial markets. Various regulatory agencies, including the SEC and the CFTC, have proposed regulations for implementation of many of the provisions of the Dodd-Frank Act and are currently seeking comments on the more recent proposals. There may be additional proposed regulations as the remaining provisions of the Dodd-Frank Act are implemented. Until the final regulations are established, we are unable to ascertain how we may be affected. Based on our assessment of the proposed regulations issued to date, we expect to be able to continue to participate in financial markets for hedging certain risks inherent in our business, including commodity and interest-rate risks; however, the costs of doing so may increase as a result of the new legislation. We may also incur additional costs associated with our compliance with the new regulations and anticipated additional record-keeping, reporting and disclosure obligations.

Legal Proceedings - We are a party to various litigation matters and claims that have arisen in the normal course of our operations. While the results of litigation and claims cannot be predicted with certainty, we believe the final outcome of such matters will not have a material adverse effect on our consolidated results of operations, financial position or liquidity.

M. SEGMENTS

Segment Descriptions - Our operations are divided into three reportable business segments as follows: (i) our ONEOK Partners segment gathers, processes, treats, transports, stores and sells natural gas and gathers, treats, fractionates, stores, distributes and markets NGLs; (ii) our Distribution segment, which includes our retail marketing operations, delivers natural gas to residential, commercial and industrial customers, and transports natural gas; and (iii) our Energy Services segment markets natural gas to wholesale customers. Our Distribution segment is comprised primarily of regulated public utilities, and portions of our ONEOK Partners segment are also regulated. Other and eliminations consist of the operating and leasing operations of our headquarters building and related parking facility and other amounts needed to reconcile our reportable segments to our consolidated financial statements.

Table of Contents

Accounting Policies - The accounting policies of the segments are the same as those described in Note A of the Notes to Consolidated Financial Statements in our Annual Report. Intersegment sales are recorded on the same basis as sales to unaffiliated customers and are discussed in further detail in Note K. Net margin is comprised of total revenues less cost of sales and fuel. Cost of sales and fuel includes commodity purchases, fuel, and storage and transportation costs.

Customers - For the three months ended March 31, 2011 and 2010, we had no single external customer from which we received 10 percent or more of our consolidated gross revenues.

Operating Segment Information - The following tables set forth certain selected financial information for our operating segments for the periods indicated:

Three Months Ended March 31, 2011	ONEOK Partners (a)			Distribution (b)		Energy Services		Other and Eliminations			Total
	(Thousands of dollars)
Sales to unaffiliated customers	$	2,402,817		$	785,695	$	677,800	$	576		$	3,866,888
Intersegment revenues		96,793			4,775		213,939		(315,507	)		-
Total revenues	$	2,499,610		$	790,470	$	891,739	$	(314,931	)	$	3,866,888

Net margin	$	329,554		$	247,406	$	55,949	$	640		$	633,549
Operating costs		108,743			106,629		8,004		236			223,612
Depreciation and amortization		42,730			35,980		149		532			79,391
Loss on sale of assets		(510	)		-		-		-			(510	)
Operating income	$	177,571		$	104,797	$	47,796	$	(128	)	$	330,036

Equity earnings from investments	$	32,092		$	-	$	-	$	-		$	32,092
Investments in unconsolidated affiliates	$	1,186,588		$	-	$	-	$	-		$	1,186,588
Total assets	$	8,482,304		$	3,178,463	$	498,451	$	880,378		$	13,039,596
Noncontrolling interests in consolidated subsidiaries	$	5,128		$	-	$	-	$	1,452,806		$	1,457,934
Capital expenditures	$	144,826		$	47,150	$	-	$	2,703		$	194,679
(a) - Our ONEOK Partners segment has regulated and non-regulated operations. Our ONEOK Partners segment’s regulated operations had revenues of $155.5 million, net margin of $115.9 million and operating income of $59.6 million.
(b) - Our Distribution segment has regulated and non-regulated operations. Our Distribution segment's regulated operations had revenues of $684.2 million, net margin of $243.7 million and operating income of $103.1 million.

Three Months Ended March 31, 2010	ONEOK Partners (a)			Distribution (b)		Energy Services		Other and Eliminations			Total
	(Thousands of dollars)
Sales to unaffiliated customers	$	2,067,075		$	997,908	$	858,232	$	752		$	3,923,967
Intersegment revenues		136,931			3,491		335,602		(476,024	)		-
Total revenues	$	2,204,006		$	1,001,399	$	1,193,834	$	(475,272	)	$	3,923,967

Net margin	$	261,125		$	246,826	$	110,618	$	750		$	619,319
Operating costs		96,306			99,776		7,426		(163	)		203,345
Depreciation and amortization		43,871			33,345		153		487			77,856
Loss on sale of assets		(786	)		-		-		-			(786	)
Operating income	$	120,162		$	113,705	$	103,039	$	426		$	337,332

Equity earnings from investments	$	21,116		$	-	$	-	$	-		$	21,116
Investments in unconsolidated affiliates	$	762,435		$	-	$	-	$	-		$	762,435
Total assets	$	7,697,369		$	3,092,696	$	666,812	$	872,315		$	12,329,192
Noncontrolling interests in consolidated subsidiaries	$	5,387		$	-	$	-	$	1,493,557		$	1,498,944
Capital expenditures	$	35,827		$	31,378	$	52	$	1,016		$	68,273
(a) - Our ONEOK Partners segment has regulated and non-regulated operations. Our ONEOK Partners segment’s regulated operations had revenues of $152.1 million, net margin of $125.6 million and operating income of $69.4 million.
(b) - Our Distribution segment has regulated and non-regulated operations. Our Distribution segment's regulated operations had revenues of $857.6 million, net margin of $242.6 million and operating income of $111.3 million.

Table of Contents

ITEM 2.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
	RESULTS OF OPERATIONS

The following discussion and analysis should be read in conjunction with our unaudited consolidated financial statements and the Notes to Consolidated Financial Statements in this Quarterly Report, as well as our Annual Report. Due to the seasonal nature of our business, the results of operations for the three months ended March 31, 2011, are not necessarily indicative of the results that may be expected for a 12-month period.

RECENT DEVELOPMENTS

Growth Projects - In May 2011, ONEOK Partners announced plans to invest approximately $910 million to $1.2 billion in its natural gas liquids business to accommodate growing NGL supplies and alleviate infrastructure constraints between the Mid-Continent and Texas Gulf Coast regions.

Sterling III Pipeline and reconfiguring Sterling I and II Pipelines - ONEOK Partners plans to build a 570-plus-mile natural gas liquids pipeline, the Sterling III Pipeline, which will have the flexibility to transport either unfractionated NGLs or NGL purity products from the Mid-Continent to the Texas Gulf Coast. The Sterling III Pipeline will traverse the NGL-rich Woodford Shale that is currently under development, as well as provide transportation capacity for NGL production from the growing Cana-Woodford Shale and Granite Wash, where the pipeline can gather unfractionated NGLs from the new natural gas processing plants that are being built as a result of increased drilling activity in these areas. The Sterling III Pipeline will have an initial capacity to transport up to 193 MBbl/d of production from ONEOK Partners’ natural gas liquids infrastructure at Medford, Oklahoma, to its storage and fractionation facilities in Mont Belvieu, Texas. Additional pump stations could expand the capacity of the pipeline to 250 MBbl/d. Following the receipt of all necessary permits and the acquisition of rights-of-way, construction is scheduled to begin in 2013, with an expected completion late the same year.

The investment also includes reconfiguring its existing Sterling I and II Pipelines, which currently distribute NGL products between the Mid-Continent and Gulf Coast NGL market centers, to transport either unfractionated NGLs or NGL products.

The project costs for the new pipeline and reconfiguring projects are estimated to be $610 million to $810 million, excluding AFUDC.

MB-2 fractionator - ONEOK Partners plans to construct a 75-MBbl/d fractionator, MB-2, in Mont Belvieu, Texas. ONEOK Partners recently submitted a permit application to the Texas Commission on Environmental Quality (TCEQ) to build this fractionator. Following the receipt of all necessary permits, construction of the MB-2 fractionator is scheduled to begin in 2011 and is expected to be completed in mid-2013. The cost of the MB-2 fractionator is estimated to be $300 million to $390 million, excluding AFUDC. The fractionator can be expanded to 125 MBbl/d to accommodate additional volumes as they are added to the Arbuckle Pipeline, Sterling III Pipeline and the Sterling I and II reconfiguration.

See discussion of ONEOK Partners' previously announced growth projects in the “Financial Results and Operating Information” section for our ONEOK Partners segment.

Debt Issuance and Maturities - In January 2011, ONEOK Partners completed an underwritten public offering of $1.3 billion of senior notes, consisting of $650 million of 3.25-percent senior notes due 2016 and $650 million of 6.125-percent senior notes due 2041. The net proceeds from the offering of approximately $1.28 billion were used to repay amounts outstanding under ONEOK Partners’ commercial paper program, to repay $225 million of ONEOK Partners’ senior notes that matured in March 2011 and for general partnership purposes, including capital expenditures.

In April 2011, ONEOK repaid $400 million of maturing senior notes with available cash and short-term borrowings.

Dividends/Distributions - We declared a quarterly dividend of $0.52 per share ($2.08 per share on an annualized basis) in April 2011, an increase of approximately 18 percent over the $0.44 declared in April 2010. A cash distribution from ONEOK Partners of $1.15 per unit ($4.60 per unit on an annualized basis) was declared in April 2011, an increase of approximately 3.6 percent over the $1.11 per unit declared in April 2010.

ONEOK 2011 Credit Agreement - On April 5, 2011, ONEOK entered into the ONEOK 2011 Credit Agreement, which replaced the ONEOK Credit Agreement.

Table of Contents

FINANCIAL RESULTS AND OPERATING INFORMATION

Consolidated Operations

Selected Financial Results - The following table sets forth certain selected financial results for the periods indicated:

	Three Months Ended						Variances
	March 31,						2011 vs. 2010
Financial Results	2011			2010			Increase (Decrease)
	(Millions of dollars)
Revenues	$	3,866.8		$	3,923.9		$	(57.1	)	(1	%)
Cost of sales and fuel		3,233.3			3,304.6			(71.3	)	(2	%)
Net margin		633.5			619.3			14.2		2	%
Operating costs		223.6			203.3			20.3		10	%
Depreciation and amortization		79.4			77.9			1.5		2	%
Loss on sale of assets		(0.5	)		(0.8	)		0.3		38	%
Operating income	$	330.0		$	337.3		$	(7.3	)	(2	%)
Equity earnings from investments	$	32.1		$	21.1		$	11.0		52	%
Interest expense	$	(79.3	)	$	(76.5	)	$	2.8		4	%
Net income attributable to noncontrolling interests	$	(69.2	)	$	(32.2	)	$	37.0		*
Capital expenditures	$	194.7		$	68.3		$	126.4		*
* Percentage change is greater than 100 percent.

Operating income decreased 2 percent for the three months ended March 31, 2011, compared with the same period last year, reflecting lower results at our Energy Services and Distribution segments, offset partially by higher operating income at our ONEOK Partners segment. Our Energy Services segment’s operating income decreased due to lower realized seasonal storage price differentials and lower transportation margins resulting from lower realized Mid-Continent-to-Gulf Coast price differentials. Our Distribution segment’s operating income decreased due to increased operating costs and depreciation and amortization expense. Our ONEOK Partners segment offset partially these decreases with higher NGL optimization margins due primarily to more favorable NGL price differentials and utilization of additional fractionation and transportation capacity available for optimization activities between the Mid-Continent and Gulf-Coast markets in its natural gas liquids business.

Our results were also impacted favorably for the three months ended March 31, 2011, compared with the same period last year, by higher equity earnings resulting from increased contracted capacity on Northern Border Pipeline and the impact of accounting for Overland Pass Pipeline Company as an equity method investment beginning in September 2010.

Net income attributable to noncontrolling interests for the three months ended March 31, 2011 and 2010, primarily reflects the portion of ONEOK Partners that we do not own. The increase in net income attributable to noncontrolling interests was due primarily to the increased income of ONEOK Partners’ natural gas liquids business.

Capital expenditures increased for the three months ended March 31, 2011, compared with the same period last year, due primarily to the new growth projects in ONEOK Partners’ natural gas gathering and processing and natural gas liquids businesses.

Additional information regarding our financial results and operating information is provided in the following discussion for each of our segments.

Table of Contents

ONEOK Partners

Overview - We own approximately 42.4 million common and Class B limited partner units, and the entire 2-percent general partner interest, which, together, represents a 42.8-percent ownership interest in ONEOK Partners. We receive distributions from ONEOK Partners on our common and Class B units and our 2-percent general partner interest, which includes our incentive distribution rights. See Note O of the Notes to Consolidated Financial Statements in our Annual Report for discussion of our incentive distribution rights.

Natural gas gathering and processing business - ONEOK Partners’ natural gas gathering and processing business is engaged in the gathering and processing of natural gas produced from crude oil and natural gas wells, primarily in the Mid-Continent and Rocky Mountain regions. These regions include the Anadarko Basin of Oklahoma that contains the NGL-rich Cana-Woodford Shale formation; Hugoton and Central Kansas Uplift Basins of Kansas; the Williston Basin of Montana and North Dakota that includes the oil-producing, NGL-rich Bakken Shale and Three Forks formations; and the Powder River Basin of Wyoming. Through gathering systems, natural gas is aggregated and treated or processed for removal of water vapor, solids and other contaminants, and to extract NGLs in order to provide marketable natural gas, commonly referred to as residue gas. When the NGLs are separated from the unprocessed natural gas at the processing plants, the NGLs are generally in the form of a mixed, unfractionated NGL stream. In the Powder River Basin, the natural gas that ONEOK Partners gathers is coal-bed methane, or dry natural gas, that does not require processing or NGL extraction, in order to be marketable. Dry natural gas is gathered, compressed and delivered into a downstream pipeline or marketed for a fee.

Natural gas pipelines business - ONEOK Partners’ natural gas pipelines business operates interstate and intrastate natural gas transmission pipelines, natural gas storage facilities and non-processable natural gas gathering facilities. ONEOK Partners also provides natural gas transportation and storage services in accordance with Section 311(a) of the Natural Gas Policy Act. ONEOK Partners’ FERC-regulated interstate assets transport natural gas through pipelines that access supply from Canada and from the Mid-Continent, Rocky Mountain and Gulf Coast regions. ONEOK Partners’ intrastate natural gas pipeline assets are located in Oklahoma, Texas and Kansas, and have access to major natural gas producing areas in those states. ONEOK Partners owns underground natural gas storage facilities in Oklahoma, Kansas and Texas.

Natural gas liquids business - ONEOK Partners’ natural gas liquids business gathers, treats, fractionates and transports NGLs and distributes and stores NGL products. ONEOK Partners’ natural gas liquids gathering pipelines deliver unfractionated NGLs gathered from natural gas processing plants located in Oklahoma, Kansas, Texas and the Rocky Mountain region to fractionators it owns in Oklahoma, Kansas and Texas, as well as to third-party fractionators and third-party pipelines. The NGLs are then separated through the fractionation process into the individual NGL products that realize the greater economic value of the NGL components. The individual NGL products are then stored or distributed to petrochemical manufacturers, heating-fuel users, refineries and propane distributors through ONEOK Partners’ FERC-regulated distribution pipelines that move NGL products from Oklahoma and Kansas to the Mid-Continent and Gulf Coast NGL market centers, as well as the Midwest markets near Chicago, Illinois.

Growth Projects - Natural gas gathering and processing business - In addition to the projects announced in May 2011, ONEOK Partners announced in 2010 and early 2011 approximately $950 million to $1.1 billion in growth projects in its natural gas gathering and processing business, primarily in the Williston Basin and Cana-Woodford Shale area that will enable ONEOK Partners to meet the rapidly growing needs of crude oil and natural gas producers in those areas.

Williston Basin Processing Plants and related projects - ONEOK Partners is constructing three new 100 MMcf/d natural gas processing facilities, the Garden Creek plant in eastern McKenzie County, North Dakota, and the Stateline I and II plants in western Williams County, North Dakota. In addition, ONEOK Partners will expand and upgrade its existing gathering and compression infrastructure and add new well connections associated with these plants. The Garden Creek plant, which is expected to be in service by the end of 2011, and related infrastructure projects are expected to cost approximately $350 million to $415 million, excluding AFUDC. The Stateline I plant, which is expected to be in service by the third quarter of 2012, and related infrastructure projects are expected to cost approximately $300 million to $355 million, excluding AFUDC. The Stateline II plant, which is expected to be in service during the first half of 2013, and related infrastructure projects are expected to cost approximately $260 million to $305 million, excluding AFUDC.

Cana-Woodford Shale projects - In 2010, ONEOK Partners completed projects totaling approximately $38 million in the Cana-Woodford Shale development in Oklahoma, which included the connection of its western Oklahoma natural gas gathering system to its Maysville natural gas processing facility in central Oklahoma, as well as new well connections to gather and process additional Cana-Woodford Shale volumes.

Table of Contents

Natural gas liquids business - ONEOK Partners also announced in 2010 and early 2011 approximately $830 million to $1.0 billion in growth projects in its natural gas liquids business, primarily in the Williston Basin, Cana-Woodford Shale and Granite Wash areas.

Bakken Pipeline and related projects - ONEOK Partners plans to build a 525- to 615-mile natural gas liquids pipeline, the Bakken Pipeline, which will transport unfractionated NGLs from the Bakken Shale to the Overland Pass Pipeline. The Bakken Pipeline will initially have capacity to transport up to 60 MBbl/d of unfractionated NGL production. The unfractionated NGLs will then be delivered to ONEOK Partners’ existing natural gas liquids fractionation and distribution infrastructure in the Mid-Continent. Project costs for the new pipeline are estimated to be $450 million to $550 million, excluding AFUDC.

Supply commitments for the Bakken Pipeline will be anchored by NGL production from ONEOK Partners’ natural gas processing plants. Following receipt of all necessary permits, construction of the 12-inch diameter pipeline is expected to begin in the second quarter of 2012 and be in service during the first half of 2013.

The unfractionated NGLs from the Bakken Pipeline and other supply sources under development in the Rockies will require installing additional pump stations and expanding existing pump stations on the Overland Pass Pipeline. These additions and expansions will increase the capacity of Overland Pass Pipeline to 255 MBbl/d. ONEOK Partners’ anticipated share of the costs for this project is estimated to be $35 million to $40 million, excluding AFUDC.

Bushton Fractionator Expansion - To accommodate the additional volume from the Bakken Pipeline, ONEOK Partners will invest $110 million to $140 million, excluding AFUDC, to expand and upgrade its existing fractionation capacity at Bushton, Kansas, increasing its capacity to 210 MBbl/d from 150 MBbl/d. This project is expected to be in service during the first half of 2013.

Cana-Woodford Shale and Granite Wash projects - ONEOK Partners plans to invest approximately $197 million to $257 million, excluding AFUDC, in its existing Mid-Continent infrastructure, primarily in the Cana-Woodford Shale and Granite Wash areas. These investments will expand ONEOK Partners’ ability to transport unfractionated NGLs from these Mid-Continent supply areas to fractionation facilities in Oklahoma and Texas and distribute purity NGL products to the Mid-Continent, Gulf Coast and upper Midwest market centers.

These investments include constructing more than 230 miles of natural gas liquids pipeline that will expand its existing Mid-Continent natural gas liquids gathering system in the Cana-Woodford Shale and Granite Wash areas. The pipeline will connect to three new third-party natural gas processing facilities that are under construction and to three existing third-party natural gas processing facilities that are being expanded. Additionally, ONEOK Partners will install additional pump stations on the Arbuckle Pipeline to increase its capacity to 240 MBbl/d. When completed, these projects are expected to add approximately 75 to 80 MBbl/d of unfractionated NGLs to ONEOK Partners’ existing natural gas liquids gathering systems. These projects are expected to be in service during the first half of 2012 and cost approximately $180 million to $240 million, excluding AFUDC.

ONEOK Partners invested approximately $17 million to increase the accessibility of new supply to the Arbuckle Pipeline and Mont Belvieu fractionation facilities.

Sterling I Pipeline Expansion - ONEOK Partners is installing seven additional pump stations for approximately $36 million, excluding AFUDC, along its existing Sterling I natural gas liquids distribution pipeline, increasing its capacity by 15 MBbl/d, which will be supplied by ONEOK Partners’ Mid-Continent natural gas liquids infrastructure. The Sterling I pipeline transports purity NGL products from ONEOK Partners’ fractionator in Medford, Oklahoma, to the Mont Belvieu, Texas, market center. The pump stations are expected to be in service in the second half of 2011.

For a discussion of ONEOK Partners’ capital expenditure financing, see “Capital Expenditures” in “Liquidity and Capital Resources” on page 43.

Table of Contents

Selected Financial Results and Operating Information - The following table sets forth certain selected financial results for our ONEOK Partners segment for the periods indicated:

	Three Months Ended						Variances
	March 31,						2011 vs. 2010
Financial Results	2011			2010			Increase (Decrease)
	(Millions of dollars)
Revenues	$	2,499.6		$	2,204.0		$	295.6		13	%
Cost of sales and fuel		2,170.1			1,942.9			227.2		12	%
Net margin		329.5			261.1			68.4		26	%
Operating costs		108.7			96.2			12.5		13	%
Depreciation and amortization		42.7			43.9			(1.2	)	(3	%)
Loss on sale of assets		(0.5	)		(0.8	)		(0.3	)	(38	%)
Operating income	$	177.6		$	120.2		$	57.4		48	%

Equity earnings from investments	$	32.1		$	21.1		$	11.0		52	%
Interest expense	$	(57.3	)	$	(54.2	)	$	3.1		6	%
Capital expenditures	$	144.8		$	35.8		$	109.0		*
* Percentage change is greater than 100 percent.

Net margin increased for the three months ended March 31, 2011, compared with the same period last year, due primarily to the following:

an increase of $56.4 million related to higher optimization margins due to more favorable NGL price differentials and the utilization of additional fractionation and transportation capacity available for optimization activities between the Conway, Kansas, and Mont-Belvieu, Texas, NGL markets centers in ONEOK Partners’ natural gas liquids business;

·	an increase of $8.9 million from higher gathered volumes, excluding the impact of the September 2010 deconsolidation of Overland Pass Pipeline Company and contract renegotiations associated with ONEOK Partners’ exchange services in its natural gas liquids business;

·	an increase of $7.9 million due to higher net realized commodity prices in ONEOK Partners’ natural gas gathering and processing business; and

·	an increase of $4.1 million due to changes in contract terms in ONEOK Partners’ natural gas gathering and processing business; offset partially by

·	a decrease of $11.9 million due to the deconsolidation of Overland Pass Pipeline Company, which is now accounted for under the equity method in ONEOK Partners’ natural gas liquids business.

Operating costs increased for the three months ended March 31, 2011, compared with the same period last year, due primarily to the following:

·	an increase of $7.8 million due to higher employee-related costs associated with incentive and benefit plans administered by ONEOK in all of ONEOK Partners’ businesses; and

·	an increase of $2.8 million due to higher ad valorem taxes associated with the completed capital projects in ONEOK Partners’ natural gas pipelines and natural gas liquids businesses; offset partially by

·	a decrease of $2.0 million due to the deconsolidation of Overland Pass Pipeline Company, which is now accounted for under the equity method of accounting in ONEOK Partners’ natural gas liquids business.

Equity earnings from investments increased for the three months ended March 31, 2011, compared with the same period last year, due primarily to increased contracted capacity on Northern Border Pipeline in ONEOK Partners’ natural gas pipelines business. Northern Border Pipeline benefited from wider natural gas price differentials between the markets it serves due to strong Midwest market demand. Equity earnings also includes Overland Pass Pipeline Company in ONEOK Partners’ natural gas liquids business, which it began accounting for under the equity method of accounting beginning in September 2010.

Capital expenditures increased for the three months ended March 31, 2011, compared with the same period last year, due primarily to the growth projects in ONEOK Partners’ natural gas gathering and processing and natural gas liquids businesses.

Table of Contents

Selected Operating Information - The following table sets forth selected operating information for ONEOK Partners’ businesses for the periods indicated:

	Three Months Ended
	March 31,
Operating Information (a)	2011			2010
Natural gas gathering and processing business
Natural gas gathered (BBtu/d)		992			1,092
Natural gas processed (BBtu/d)		641			664
Residue gas sales (BBtu/d)		274			275
Realized composite NGL net sales price ($/gallon) (b)	$	1.09		$	0.99
Realized condensate net sales price ($/Bbl) (b)	$	76.25		$	62.39
Realized residue gas net sales price ($/MMBtu) (b)	$	6.06		$	5.20
Realized gross processing spread ($/MMBtu)	$	8.33		$	6.37
Natural gas pipelines business
Natural gas transportation capacity contracted (MDth/d) (c)		5,608			5,906
Transportation capacity subscribed		87	%		91	%
Average natural gas price
Mid-Continent region ($/MMBtu)	$	4.10		$	5.03
Natural gas liquids business
NGL sales (MBbl/d)		478			427
NGLs fractionated (MBbl/d)		488			492
NGLs transported-gathering lines (MBbl/d) (d)		397			441
NGLs transported-distribution lines (MBbl/d)		461			467
Conway-to-Mont Belvieu OPIS average price differential
Ethane ($/gallon)	$	0.15		$	0.08
(a) - For consolidated entities only.
(b) - Presented net of the impact of hedging activities and includes equity volumes only.
(c) - Unit of measure converted from MMcf/d in the third quarter of 2010. Prior period has been recast to reflect this change.
(d) - 2010 volume information includes 96 MBbl/d related to Overland Pass Pipeline Company which is accounted for under the equity method in 2011.

Commodity Price Risk - The following tables set forth ONEOK Partners’ hedging information for the periods indicated, as of May 3, 2011:

	Nine Months Ending
	December 31, 2011
	Volumes Hedged		Average Price		Percentage Hedged
NGLs (Bbl/d) (a)		5,488	$ 1.18	/ gallon		66%
Condensate (Bbl/d) (a)		1,648	$ 2.14	/ gallon		77%
Total (Bbl/d)		7,136	$ 1.40	/ gallon		68%
Natural gas (MMBtu/d)		25,118	$ 5.60	/ MMBtu		78%
(a) - Hedged with fixed-price swaps.

	Year Ending
	December 31, 2012
	Volumes Hedged		Average Price		Percentage Hedged
NGLs (Bbl/d) (a)		5,169	$ 1.61	/ gallon		47%
Condensate (Bbl/d) (a)		1,819	$ 2.43	/ gallon		75%
Total (Bbl/d)		6,988	$ 1.82	/ gallon		52%
(a) - Hedged with fixed-price swaps.

Table of Contents

	Year Ending
	December 31, 2013
	Volumes Hedged		Average Price		Percentage Hedged
NGLs (Bbl/d) (a)		367	$ 2.55	/ gallon		2%
Condensate (Bbl/d) (a)		649	$ 2.55	/ gallon		25%
Total (Bbl/d)		1,016	$ 2.55	/ gallon		5%
(a) - Hedged with fixed-price swaps.

ONEOK Partners’ commodity price risk is estimated as a hypothetical change in the price of NGLs, crude oil and natural gas at March 31, 2011, excluding the effects of hedging, and assuming normal operating conditions. ONEOK Partners’ condensate sales are based on the price of crude oil. ONEOK Partners estimates the following:

·	a $0.01 per gallon change in the composite price of NGLs would change annual net margin by approximately $1.3 million;

·	a $1.00 per barrel change in the price of crude oil would change annual net margin by approximately $1.1 million; and

·	a $0.10 per MMBtu change in the price of natural gas would change annual net margin by approximately $1.4 million.

These estimates do not include any effects on demand for ONEOK Partners’ services or processing plant operations that might be caused by, or arise in conjunction with, price changes. For example, a change in the gross processing spread may cause a change in the amount of ethane extracted from the natural gas stream, impacting gathering and processing margins for certain contracts.

See Note C of the Notes to Consolidated Financial Statements in this Quarterly Report for more information on ONEOK Partners’ hedging activities.

Distribution

Overview - Our Distribution segment provides natural gas distribution services to more than 2 million customers in Oklahoma, Kansas and Texas through Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service. We serve residential, commercial, industrial and transportation customers in all three states. In addition, our distribution companies serve wholesale and public authority customers. Our Distribution segment’s retail marketing business serves municipal, small commercial, industrial and agricultural customers in the Mid-Continent region, residential and agricultural customers in Nebraska and residential customers in Wyoming.

Selected Financial Results - The following table sets forth certain selected financial results for our Distribution segment for the periods indicated:

	Three Months Ended				Variances
	March 31,				2011 vs. 2010
Financial Results	2011		2010		Increase (Decrease)
	(Millions of dollars)
Gas sales	$	750.9	$	962.5	$	(211.6	)	(22	%)
Transportation revenues		29.0		29.6		(0.6	)	(2	%)
Cost of gas		543.1		754.6		(211.5	)	(28	%)
Net margin, excluding other revenues		236.8		237.5		(0.7	)	(0	%)
Other revenues		10.6		9.3		1.3		14	%
Net Margin		247.4		246.8		0.6		0	%
Operating costs		106.6		99.8		6.8		7	%
Depreciation and amortization		36.0		33.3		2.7		8	%
Operating income	$	104.8	$	113.7	$	(8.9	)	(8	%)
Capital expenditures	$	47.2	$	31.4	$	15.8		50	%

Table of Contents

The following table sets forth our net margin, excluding other revenues, by type of customer, for the periods indicated:

	Three Months Ended				Variances
	March 31,				2011 vs. 2010
Net margin, excluding other revenues	2011		2010		Increase (Decrease)
Gas sales	(Millions of dollars)
Regulated
Residential	$	165.2	$	165.0	$	0.2		0	%
Commercial		36.6		36.4		0.2		1	%
Industrial		0.8		0.7		0.1		14	%
Wholesale/Public Authority		1.5		1.6		(0.1	)	(6	%)
Retail marketing		3.7		4.2		(0.5	)	(12	%)
Net margin on gas sales		207.8		207.9		(0.1	)	(0	%)
Transportation margin		29.0		29.6		(0.6	)	(2	%)
Net margin, excluding other revenues	$	236.8	$	237.5	$	(0.7	)	(0	%)

Net margin was relatively unchanged for the three months ended March 31, 2011, compared with the same period last year.

Operating costs increased for the three months ended March 31, 2011, compared with the same period last year, due primarily to $4.6 million in higher share-based compensation costs from common stock awarded to employees as part of ONEOK’s stock award program and the appreciation in our share price and $1.2 million from increased pension costs as a result of the change in our estimated discount rate.

Depreciation and amortization expense increased for the three months ended March 31, 2011, compared with the same period last year, due primarily to an increase of $1.7 million in regulatory amortization associated with previously deferred costs that have been approved for recovery in our revenues and higher depreciation expense of $1.2 million associated with the additional capital expenditures in 2010, particularly an additional investment of $31 million in automated meter reading in Oklahoma.

Capital Expenditures - Our capital expenditures program includes expenditures for extending service to new areas, modifications to customer-service lines, increasing system capabilities, general replacements and improvements. It is our practice to maintain and upgrade facilities to ensure safe, reliable and efficient operations.

Capital expenditures increased for the three months ended March 31, 2011, compared with the same period last year, due to the completion of certain activities earlier in 2011 as compared with the same period last year and continued investment in automated meter reading in Oklahoma.

Table of Contents

Selected Operating Information - The following tables set forth certain selected information for the regulated operations of our Distribution segment for the periods indicated:

	Three Months Ended
	March 31,
Number of Customers	2011		2010
Residential		1,938,529		1,930,678
Commercial		156,440		157,488
Industrial		1,247		1,296
Wholesale/Public Authority		2,784		2,657
Transportation		11,607		9,406
Total customers		2,110,607		2,101,525

	Three Months Ended
	March 31,
Volumes (MMcf)	2011		2010
Gas sales
Residential		58,465		62,456
Commercial		15,555		17,178
Industrial		423		394
Wholesale/Public Authority		1,169		1,484
Total volumes sold		75,612		81,512
Transportation		62,449		62,154
Total volumes delivered		138,061		143,666

Residential and commercial volumes decreased for the three months ended March 31, 2011, compared with the same period last year, due to warmer temperatures across our entire service territory in the first quarter of 2011; however, the impact on margin was moderated by weather-normalization mechanisms.

Regulatory Initiatives - Oklahoma - In February 2011, Oklahoma Natural Gas filed its first application related to its performance-based rate change mechanism. The application does not seek a modification of customer rates because Oklahoma Natural Gas’ regulatory return on equity was within the range approved by the OCC. This filing is under review by the OCC, with a final order expected in the second quarter of 2011.

In September 2010, Oklahoma Natural Gas filed an application and supporting testimony with the OCC seeking approval of a demand portfolio of conservation and energy-efficiency programs and authorizing recovery of costs and performance incentives. A settlement agreement was reached between all the parties and filed at the OCC on February 10, 2011. This agreement allows Oklahoma Natural Gas to pursue the key energy-efficiency programs requested in its filing. The settlement agreement was presented to an administrative law judge in a hearing on February 18, 2011. The administrative law judge is reviewing the settlement agreement, and we expect a ruling in the second quarter of 2011.

Texas - Texas Gas Service made annual filings for interim rate relief under the Gas Reliability Infrastructure Program statute with the cities of Austin, Texas, and surrounding communities in February 2011 and El Paso, Texas, in May 2011 for approximately $1.6 million and $1.1 million, respectively. This statute is a capital recovery mechanism that allows for an interim rate adjustment providing recovery and a return on incremental capital investments made between rate cases. If approved, new rates are expected to become effective for the Austin area in June 2011 and for El Paso in August 2011. In the normal course of business, we have filed for cost-of-service adjustments in various Texas jurisdictions that address investments in rate base and changes in expense.

Energy Services

Overview - Our Energy Services segment’s primary focus is to create value for our customers by delivering physical natural gas products and risk-management services through our network of contracted natural gas transportation and storage capacity and natural gas supply. This contracted storage and transportation capacity connects the major supply and demand centers throughout the United States and into Canada. Our customers are primarily LDCs, electric utilities, and commercial and industrial end-users. Our customers’ natural gas needs vary with seasonal changes in weather and are therefore somewhat unpredictable.

To ensure natural gas is available when our customers need it, we offer premium services and products that satisfy our customers’ swing and peaking natural gas commodity requirements on a year-round basis. We also provide no-notice service, weather-related protection and other custom solutions based on our customers’ specific needs. Our storage and

Table of Contents

transportation assets enable us to provide these services and provide us with opportunities to optimize our contracted assets through our application of market knowledge and risk-management skills.

Our Energy Services segment has focused its efforts on aligning its contracted natural gas transportation and storage capacity with meeting the needs of its premium-services customers. The effect of this strategy has been a reduction in its contracted natural gas transportation and storage capacity, which also will reduce its working-capital requirements primarily through a reduction in natural gas inventory levels.

Selected Financial Results - The following table sets forth certain selected financial results for our Energy Services segment for the periods indicated:

	Three Months Ended				Variances
	March 31,				2011 vs. 2010
Financial Results	2011		2010		Increase (Decrease)
	(Millions of dollars)
Revenues	$	891.7	$	1,193.8	$	(302.1	)	(25	%)
Cost of sales and fuel		835.8		1,083.2		(247.4	)	(23	%)
Net margin		55.9		110.6		(54.7	)	(49	%)
Operating costs		8.0		7.4		0.6		8	%
Depreciation and amortization		0.1		0.2		(0.1	)	(50	%)
Operating income	$	47.8	$	103.0	$	(55.2	)	(54	%)

The following table sets forth our margins by activity for the periods indicated:

	Three Months Ended				Variances
	March 31,				2011 vs. 2010
	2011		2010		Increase (Decrease)
	(Millions of dollars)
Marketing, storage and transportation revenues, gross	$	97.3	$	163.4	$	(66.1	)	(40	%)
Storage and transportation costs		41.9		54.7		(12.8	)	(23	%)
Marketing, storage and transportation, net		55.4		108.7		(53.3	)	(49	%)
Financial trading, net		0.5		1.9		(1.4	)	(74	%)
Net margin	$	55.9	$	110.6	$	(54.7	)	(49	%)

Marketing, storage and transportation revenues, gross, primarily includes marketing, purchases and sales, premium services and the impact of cash flow and fair value hedges and other derivative instruments used to manage our risk associated with these activities. Storage and transportation costs primarily include the cost of leasing capacity, storage injection and withdrawal fees, fuel charges and gathering fees. Risk management and operational decisions have an impact on the net result of our marketing, premium services and storage activities. We evaluate our strategies on an ongoing basis to optimize the value of our contracted assets and to minimize the financial impact of market conditions on the services we provide.

Financial trading, net, includes activities that are executed generally using financially settled derivatives. These activities are normally short term in nature, with a focus on capturing short-term price volatility. Revenues in our Consolidated Statements of Income include financial trading margins, as well as certain physical natural gas transactions with our trading counterparties. Revenues and cost of sales and fuel from such physical transactions are reported on a net basis.

Net margin decreased for the three months ended March 31, 2011, compared with the same period last year, due primarily to the following:

·	a decrease of $31.6 million in storage and marketing margins, net of hedging activities, due primarily to lower realized seasonal storage price differentials;

·	a decrease of $14.9 million in transportation margins, net of hedging, due primarily to narrower realized Mid-Continent-to-Gulf Coast price differentials;

·	a decrease of $6.8 million in premium-services margins, associated primarily with the reduction in the value of the fee collected for services as a result of low commodity prices and reduced market volatility; and

·	a decrease of $1.4 million in financial trading margins.

Table of Contents

Selected Operating Information - The following table sets forth certain selected operating information for our Energy Services segment for the periods indicated:

	Three Months Ended
	March 31,
Operating Information	2011		2010
Natural gas marketed (Bcf)		259		268
Natural gas gross margin ($/Mcf)	$	0.22	$	0.42
Physically settled volumes (Bcf)		494		509

Natural gas volumes marketed and physically settled volumes decreased for the three months ended March 31, 2011, compared with the same period last year, due primarily to reduced transportation capacity and lower transported volumes. Transportation capacity in certain markets was not utilized due to the economics of the location differentials.

Our natural gas in storage at March 31, 2011, was 28.3 Bcf, compared with 25.0 Bcf at March 31, 2010. At March 31, 2011, our total natural gas storage capacity under lease was 73.6 Bcf, compared with 82.8 Bcf at March 31, 2010. At March 31, 2011, our natural gas storage capacity under lease had a maximum withdrawal capability of 2.2 Bcf/d and maximum injection capability of 1.3 Bcf/d. At March 31, 2011, our natural gas transportation capacity was 1.3 Bcf/d, of which 1.1 Bcf/d was contracted under long-term natural gas transportation contracts, compared with 1.7 Bcf/d of total capacity and 1.5 Bcf/d of long-term capacity at March 31, 2010.

CONTINGENCIES

LIQUIDITY AND CAPITAL RESOURCES

General - Part of our strategy is to grow through internally generated growth projects and acquisitions that strengthen and complement our existing assets. ONEOK and ONEOK Partners have relied primarily on operating cash flow, commercial paper, bank credit facilities, debt issuances and/or the sale of equity for their liquidity and capital resource requirements. ONEOK and ONEOK Partners fund their operating expenses, debt service, dividends to shareholders and distributions to unitholders primarily with operating cash flow. Capital expenditures are funded by operating cash flow, short- and long-term debt and issuances of equity. We expect to continue to use these sources for liquidity and capital resource needs on both a short- and long-term basis. Neither ONEOK nor ONEOK Partners guarantees the debt or other similar commitments to unaffiliated parties, and ONEOK does not guarantee the debt or other similar commitments of ONEOK Partners.

ONEOK’s and ONEOK Partners’ ability to continue to access capital markets for debt and equity financing under reasonable terms depends on market conditions and ONEOK’s and ONEOK Partners’ respective financial condition and credit ratings. ONEOK and ONEOK Partners anticipate that cash flow generated from operations, existing capital resources and ability to obtain financing will enable both entities to maintain current levels of operations and planned operations, collateral requirements and fund capital expenditures.

Capitalization Structure - The following table sets forth our consolidated capitalization structure for the periods indicated:

	March 31,	December 31,
	2011	2010
Long-term debt	58%	52%
Total equity	42%	48%

Debt (including notes payable)	58%	55%
Total equity	42%	45%

Table of Contents

For the purpose of determining compliance with financial covenants in the ONEOK Credit Agreement, which are described below, the debt of ONEOK Partners is excluded. The following table sets forth ONEOK’s capital structure, excluding the debt of ONEOK Partners, for the periods indicated:

	March 31,	December 31,
	2011	2010
Long-term debt	38%	38%
ONEOK shareholders' equity	62%	62%

Debt (including notes payable)	38%	40%
ONEOK shareholders' equity	62%	60%

Stock Repurchase Program - Our Board of Directors has authorized a three-year stock repurchase program to buy up to $750 million of our outstanding common stock, subject to the limitation that purchases will not exceed $300 million in any one calendar year. If shares are repurchased, they will be acquired from time to time in open-market transactions or through privately negotiated transactions at our discretion, subject to market conditions and other factors. Any purchases will be funded by our available cash, free cash flow and short-term borrowings. The program will terminate upon completion of the repurchase of $750 million of common stock or on December 31, 2013, whichever occurs first. As of May 3, 2011, no shares have been repurchased under the program.

Short-term Liquidity - ONEOK’s principal sources of short-term liquidity consist of cash generated from operating activities, quarterly distributions from ONEOK Partners and the issuance of commercial paper. To the extent commercial paper is unavailable, the ONEOK 2011 Credit Agreement may be utilized. ONEOK Partners’ principal sources of short-term liquidity consist of cash generated from operating activities, ONEOK Partners’ commercial paper program and the ONEOK Partners Credit Agreement.

·	a limitation on ONEOK’s stand-alone debt-to-capital ratio, which may not exceed 67.5 percent at the end of any calendar quarter;

·	limitations on the ratio of indebtedness secured by liens and indebtedness of subsidiaries to consolidated net tangible assets;

·	a requirement that ONEOK maintains the power to control the management and policies of ONEOK Partners; and

·	a limit on new investments in master limited partnerships.

The total amount of short-term borrowings authorized by ONEOK’s Board of Directors is $2.5 billion. At March 31, 2011, ONEOK had no commercial paper outstanding, $2.0 million in letters of credit issued under the ONEOK Credit Agreement and approximately $252.7 million of available cash and cash equivalents. ONEOK had approximately $1.2 billion of credit available at March 31, 2011, under the ONEOK Credit Agreement. As of March 31, 2011, ONEOK could have issued $3.9 billion of additional short- and long-term debt under the most restrictive provisions contained in its various borrowing agreements.

ONEOK Partners Credit Agreement - The total amount of short-term borrowings authorized by the Board of Directors of ONEOK Partners GP, the general partner of ONEOK Partners, is $2.5 billion. At March 31, 2011, ONEOK Partners had no commercial paper outstanding and no borrowings outstanding under the ONEOK Partners Credit Agreement. As a result of ONEOK Partners’ January 2011 debt issuance, its available borrowings are limited by the ratio of indebtedness to adjusted EBITDA (EBITDA, as defined in ONEOK Partners’ Credit Agreement, as adjusted for all non-cash charges and increased

Table of Contents

for projected EBITDA from certain lender-approved capital expansion projects) covenant under the ONEOK Partners Credit Agreement; however, ONEOK Partners had approximately $617.4 million of cash at March 31, 2011, and $772.0 million available borrowings to meet its liquidity needs. At March 31, 2011, ONEOK Partners had no letters of credit issued outside the ONEOK Partners Credit Agreement.

Among other things, the ONEOK Partners Credit Agreement covenants include maintaining a ratio of indebtedness to adjusted EBITDA of no more than 5 to 1. If ONEOK Partners consummates one or more acquisitions in which the aggregate purchase price is $25 million or more, the allowable ratio of indebtedness to adjusted EBITDA will be increased to 5.5 to 1 for the three calendar quarters following the acquisition. Upon any breach of certain covenants by ONEOK Partners in its credit agreement, amounts outstanding under the ONEOK Partners Credit Agreement may become due and payable immediately. At March 31, 2011, ONEOK Partners’ ratio of indebtedness to adjusted EBITDA was 4.17 to 1, and ONEOK Partners was in compliance with all covenants under the ONEOK Partners Credit Agreement.

The ONEOK Credit Agreement and the ONEOK Partners Credit Agreement contain certain financial, operational and legal covenants as discussed in Note F of the Notes to Consolidated Financial Statements in our Annual Report.

Long-term Financing - In addition to the principal sources of short-term liquidity discussed above, options available to ONEOK to meet its longer-term cash requirements include the issuance of equity, issuance of long-term notes, issuance of convertible debt securities, asset securitization and the sale and leaseback of facilities. Options available to ONEOK Partners to meet its longer-term cash requirements include the issuance of common units, issuance of long-term notes, issuance of convertible debt securities, and asset securitization and sale and leaseback of facilities.

ONEOK and ONEOK Partners are subject to changes in the debt and equity markets, and there is no assurance they will be able or willing to access the public or private markets in the future. ONEOK and ONEOK Partners may choose to meet their cash requirements by utilizing some combination of cash flows from operations, borrowing under existing commercial paper or credit facilities, altering the timing of controllable expenditures, restricting future acquisitions and capital projects, or pursuing other debt or equity financing alternatives. Some of these alternatives could involve higher costs or negatively affect their respective credit ratings, among other factors. Based on ONEOK’s and ONEOK Partners’ investment-grade credit ratings, general financial condition and market expectations regarding their future earnings and projected cash flows, ONEOK and ONEOK Partners believe that they will be able to meet their respective cash requirements and maintain their investment-grade credit ratings.

ONEOK Partners’ Debt Issuance and Maturity - In January 2011, ONEOK Partners completed an underwritten public offering of $1.3 billion of senior notes, consisting of $650 million of 3.25-percent senior notes due 2016 and $650 million of 6.125-percent senior notes due 2041. The net proceeds from the offering of approximately $1.28 billion were used to repay amounts outstanding under ONEOK Partners’ commercial paper program, to repay $225 million of ONEOK Partners’ senior notes that matured in March 2011 and for general partnership purposes, including capital expenditures.

ONEOK Debt Maturity - In April 2011, ONEOK repaid $400 million of maturing senior notes with available cash and short-term borrowings.

Debt Covenants - The indentures governing ONEOK’s senior notes due 2019 and 2028 include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the senior notes due 2015 and 2035 include an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding senior notes due 2015, 2019, 2028 and 2035 to declare those notes immediately due and payable in full.

ONEOK may redeem the notes due 2015, 2028 (6.875 percent) and 2035, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium. ONEOK may redeem the notes due 2019 and 2028 (6.5 percent), in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest. The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date. ONEOK’s senior notes due 2015, 2019, 2028 and 2035 are senior unsecured obligations, ranking equally in right of payment with all of ONEOK’s existing and future unsecured senior indebtedness.

The indentures governing ONEOK Partners’ senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners’ outstanding senior notes to declare those notes immediately due and payable in full.

Table of Contents

ONEOK Partners may redeem the notes due 2012, 2016 (6.15 percent), 2019, 2036 and 2037, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium. The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date. ONEOK Partners may redeem its 3.25-percent notes due 2016 and 6.125-percent notes due 2041 at par starting one month and six months, respectively, before their maturities. Prior to these dates, ONEOK Partners may redeem these notes on the same terms as its other senior notes. ONEOK Partners’ senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners’ existing and future unsecured senior indebtedness, and structurally subordinate to all of the existing and future debt and other liabilities of any non-guarantor subsidiaries. ONEOK Partners’ senior notes are nonrecourse to ONEOK.

Capital Expenditures - ONEOK’s and ONEOK Partners’ capital expenditures are financed typically through operating cash flows, short- and long-term debt and the issuance of equity. Capital expenditures were $194.7 million and $68.3 million for the three months ended March 31, 2011 and 2010, respectively. Of these amounts, ONEOK Partners’ capital expenditures were $144.8 million and $35.8 million for the three months ended March 31, 2011 and 2010, respectively. Capital expenditures for 2011 increased, compared with the same period last year, due primarily to the growth projects in ONEOK Partners’ natural gas gathering and processing and natural gas liquids businesses primarily in the Williston Basin.

The following table sets forth our 2011 projected capital expenditures, excluding AFUDC:

2011 Projected Capital Expenditures
	(Millions of dollars)
ONEOK Partners	$	1,116
Distribution		224
Other		22
Total projected capital expenditures	$	1,362

Unconsolidated Affiliates - Northern Border Pipeline anticipates requiring additional equity contributions of approximately $100 million to $120 million from its partners in 2011, of which ONEOK Partners’ share will be approximately $50 million to $60 million based on its 50-percent equity interest.

In 2011 and 2012, ONEOK Partners expects to make contributions totaling approximately $35 million to $40 million to Overland Pass Pipeline Company to install additional pump stations and to expand existing pump stations to increase the capacity of the pipeline to accommodate increased volumes of unfractionated NGLs from the Bakken Pipeline and other supply sources under development in the Rockies.

Other - ONEOK Partners has certain contractual rights to the Bushton Plant through a Processing and Services Agreement with us, which sets out the terms for processing and related services we provide at the Bushton Plant through May 2012. ONEOK Partners has contracted for all of the capacity of the Bushton Plant from us. In exchange, ONEOK Partners pays us for all costs and expenses necessary for the operation and maintenance of the Bushton Plant and reimburses us for our obligations under equipment leases covering portions of the Bushton Plant. Pursuant to its rights under the Processing and Services Agreement, on April 22, 2011, ONEOK Partners directed us to exercise our purchase option for the original leased equipment (or any replacement parts) pursuant to the terms of the equipment leases. The Processing and Services Agreement provides that ONEOK Partners will reimburse us for any amounts incurred in connection with the exercised option, and upon reimbursement, ONEOK Partners will become the owner of the purchased equipment.

Credit Ratings - Our credit ratings as of March 31, 2011, are shown in the table below:

	ONEOK		ONEOK Partners
Rating Agency	Rating	Outlook	Rating	Outlook
Moody’s	Baa2	Stable	Baa2	Stable
S&P	BBB	Stable	BBB	Stable

ONEOK’s and ONEOK Partners’ commercial paper programs are each rated Prime-2 by Moody’s and A2 by S&P. ONEOK’s and ONEOK Partners’ credit ratings, which currently are investment grade, may be affected by a material change in financial ratios or a material event affecting the business. The most common criteria for assessment of credit ratings are the debt-to-capital ratio, business risk profile, pretax and after-tax interest coverage, and liquidity. ONEOK and ONEOK Partners currently do not anticipate their respective credit ratings to be downgraded. However, if ONEOK’s or ONEOK Partners’ credit ratings were downgraded, the cost to borrow funds under their respective commercial paper programs and credit agreements would increase, and ONEOK or ONEOK Partners potentially could lose access to the commercial paper

Table of Contents

market. In the event that ONEOK is unable to borrow funds under its commercial paper program and there has not been a material adverse change in its business, ONEOK would continue to have access to the ONEOK 2011 Credit Agreement, which expires in April 2016. In the event that ONEOK Partners is unable to borrow funds under its commercial paper program and there has not been a material adverse change in its business, ONEOK Partners would continue to have access to the ONEOK Partners Credit Agreement, which expires in March 2012. An adverse rating change alone is not a default under the ONEOK 2011 Credit Agreement or the ONEOK Partners Credit Agreement.

Our Energy Services segment relies upon the investment-grade rating of ONEOK’s senior unsecured long-term debt to reduce its collateral requirements. If ONEOK’s credit ratings were to decline below investment grade, our ability to participate in energy marketing and trading activities could be significantly limited. Without an investment-grade rating, we may be required to fund margin requirements with our counterparties with cash, letters of credit or other negotiable instruments. At March 31, 2011, ONEOK could have been required to fund approximately $25.7 million in margin requirements related to financial contracts upon such a downgrade. A decline in ONEOK’s credit rating below investment grade may also significantly impact other business segments.

In the normal course of business, ONEOK’s and ONEOK Partners’ counterparties provide secured and unsecured credit. In the event of a downgrade in ONEOK’s or ONEOK Partners’ credit ratings or a significant change in ONEOK’s or ONEOK Partners’ counterparties’ evaluation of our creditworthiness, ONEOK or ONEOK Partners could be required to provide additional collateral in the form of cash, letters of credit or other negotiable instruments as a condition of continuing to conduct business with such counterparties.

Commodity Prices - We are subject to commodity price volatility. Significant fluctuations in commodity prices may impact our overall liquidity due to the impact commodity price changes have on our cash flows from operating activities, including the impact on working capital for NGLs and natural gas held in storage, margin requirements and certain energy-related receivables. We believe that ONEOK’s and ONEOK Partners’ available credit and cash and cash equivalents are adequate to meet liquidity requirements associated with commodity price volatility. See discussion beginning on page 50 under “Commodity Price Risk” in Item 3, Quantitative and Qualitative Disclosures about Market Risk, for information on our hedging activities.

Pension and Postretirement Benefit Plans - Information about our pension and postretirement benefits plans, including anticipated contributions, is included under Note L of the Notes to Consolidated Financial Statements in our Annual Report. See Note I of the Notes to Consolidated Financial Statements in this Quarterly Report for additional information.

CASH FLOW ANALYSIS

We use the indirect method to prepare our Consolidated Statements of Cash Flows. Under this method, we reconcile net income to cash flows provided by operating activities by adjusting net income for those items that impact net income but may not result in actual cash receipts or payments during the period. These reconciling items include depreciation and amortization, allowance for equity funds used during construction, gain or loss on sale of assets, equity earnings from investments, distributions received from unconsolidated affiliates, deferred income taxes, share-based compensation expense and other amounts and changes in our assets and liabilities not classified as investing or financing activities.

The following table sets forth the changes in cash flows by operating, investing and financing activities for the periods indicated:

	Three Months Ended						Variances
	March 31,						2011 vs. 2010
	2011			2010			Increase (Decrease)
	(Millions of dollars)
Total cash provided by (used in):
Operating activities	$	647.8		$	558.7		$	89.1
Investing activities		(189.5	)		(66.4	)		(123.1	)
Financing activities		380.8			(354.3	)		735.1
Change in cash and cash equivalents		839.1			138.0			701.1
Cash and cash equivalents at beginning of period		31.0			29.4			1.6
Cash and cash equivalents at end of period	$	870.1		$	167.4		$	702.7

Operating Cash Flows - Operating cash flows are affected by earnings from our business activities. Changes in commodity prices and demand for our services or products, whether because of general economic conditions, changes in demand for the end products that are made with our products or increased competition from other service providers, could affect our earnings

Table of Contents

and operating cash flows.

Cash flows from operating activities, before changes in operating assets and liabilities, were $333.9 million for the three months ended March 31, 2011, compared with $289.9 million for the same period in 2010. The increase was due primarily to changes in net margin and operating expenses discussed in Financial Results and Operating Information on page 31.

The changes in operating assets and liabilities increased operating cash flows $313.9 million for the three months ended March 31, 2011, compared with an increase of $268.8 million for the same period in 2010, due primarily to a decrease in volumes of commodities in storage in ONEOK Partners’ natural gas liquids business and our Distribution segment in the current period, compared with an increase in volumes in storage in ONEOK Partners’ natural gas liquids business in the same period last year.

Investing Cash Flows - Cash used in investing activities increased for the three months ended March 31, 2011, compared with the same period in 2010, due primarily to ONEOK Partners’ growth projects in its natural gas gathering and processing and natural gas liquids businesses.

Financing Cash Flows - Cash provided by financing activities increased for the three months ended March 31, 2011, compared with the same period in 2010. The change is a result of ONEOK Partners’ January 2011 debt issuance, a portion of the proceeds from which were used to repay short-term borrowings and the scheduled maturity of long-term debt. The remainder of the funds are used to fund ONEOK Partners’ growth projects and for general partnership purposes. The net cash flows provided by these financing activities were partially offset by increased distributions to noncontrolling interests and increased dividends.

REGULATORY

Financial Markets Legislation - The Dodd-Frank Act represents a far-reaching overhaul of the framework for regulation of United States financial markets. Various regulatory agencies, including the SEC and the CFTC, have proposed regulations for implementation of many of the provisions of the Dodd-Frank Act and are currently seeking comments on the more recent proposals. There may be additional proposed regulations as the remaining provisions of the Dodd-Frank Act are implemented. Until the final regulations are established, we are unable to ascertain how we may be affected. Based on our assessment of the proposed regulations issued to date, we expect to be able to continue to participate in financial markets for hedging certain risks inherent in our business, including commodity and interest rate risks; however, the costs of doing so may increase as a result of the new legislation. We may also incur additional costs associated with our compliance with the new regulations and anticipated additional record-keeping, reporting and disclosure obligations.

Health Care Legislation - Based on our analysis of the Patient Protection and Affordable Care Act and the Health Care and Education Reconciliation Act of 2010 (collectively, the Health Care Acts), we do not expect a significant impact to our benefit plans or their related costs. We continue to evaluate the implications of the provisions of the Health Care Acts and expect to continue to provide benefit plan options that meet the provisions outlined by the Health Care Acts.

Other - Several regulatory initiatives impacted the earnings and future earnings potential for our Distribution segment. See discussion of our Distribution segment’s regulatory initiatives on page 38.

IMPACT OF NEW ACCOUNTING STANDARDS

Information about the impact of new accounting standards is included in Note A of the Notes to Consolidated Financial Statements in this Quarterly Report. ASU 2010-06, “Improving Disclosures about Fair Value Measurements,” is a disclosure only standard, which did not have a material impact. See Note B of the Notes to Consolidated Financial Statements for discussion of our fair value measurements.

ESTIMATES AND CRITICAL ACCOUNTING POLICIES

The preparation of our consolidated financial statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amount of assets and liabilities, and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements. These estimates and assumptions also affect the reported amounts of revenue and expenses during the reporting period. Although we believe these estimates and assumptions are reasonable, actual results could differ from our estimates.

Table of Contents

Information about our estimates and critical accounting policies is included under Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, “Estimates and Critical Accounting Policies,” in our Annual Report.

ENVIRONMENTAL AND SAFETY MATTERS

Additional information about our environmental matters is included in Note L of the Notes to Consolidated Financial Statements in this Quarterly Report.

Air and Water Emissions - The Clean Air Act, the Clean Water Act and analogous state laws impose restrictions and controls regarding the discharge of pollutants into the air and water in the United States. Under the Clean Air Act, a federally enforceable operating permit is required for sources of significant air emissions. We may be required to incur certain capital expenditures for air-pollution-control equipment in connection with obtaining or maintaining permits and approvals for sources of air emissions. The Clean Water Act imposes substantial potential liability for the removal of pollutants discharged to waters of the United States and remediation of waters affected by such discharge.

Federal, state and regional initiatives to regulate greenhouse gas emissions are under way. We are monitoring federal and state legislation to assess the potential impact on our operations. We estimate our direct greenhouse gas emissions annually as we collect certain greenhouse gas emission data for the previous year. Our most recent estimate for ONEOK and ONEOK Partners indicates that our direct emissions were less than 4.5 million metric tons of carbon dioxide equivalents during 2009. This does not include the carbon-dioxide equivalents of NGLs and natural gas delivered to certain customers as required by the EPA’s Mandatory Greenhouse Gas Reporting rule. The EPA’s Mandatory Greenhouse Gas Reporting rule, released in September 2009, requires greenhouse gas emissions reporting for affected facilities on an annual basis and requires us to track the emission equivalents for the natural gas delivered by us to our distribution customers and emission equivalents for all NGLs delivered to customers of ONEOK Partners. Our 2010 emissions report is due in September 2011 as a result of the EPA extending the original March 31, 2011, deadline. Also, the EPA has recently released a subpart to the Mandatory Greenhouse Gas Reporting Rule that will require the reporting of vented and fugitive emissions of methane from our facilities. The new requirements began in January 2011, with the first reporting of fugitive emissions due March 31, 2012. We do not expect the cost to gather this emission data to have a material impact on our results of operations, financial position or cash flows. In addition, the United States Congress has considered, and may consider in the future, legislation to

Table of Contents

reduce greenhouse gas emissions, including carbon dioxide and methane. At this time, no rule or legislation has been enacted that assess any costs, fees or expenses on any of these emissions.

In May 2010, the EPA finalized the “Tailoring Rule” that will regulate greenhouse gas emissions at new or modified facilities that meet certain criteria. Affected facilities will be required to review best available control technology, conduct air-quality analysis, impact analysis and public reviews with respect to such emissions. The rule was phased in beginning January 2011 and, at current emission threshold levels, we believe it will have a minimal impact on our existing facilities. The EPA has stated it will consider lowering the threshold levels over the next five years, which could increase the impact on our existing facilities. However, potential costs, fees or expenses associated with the potential adjustments are unknown.

In addition, the EPA issued a rule on air-quality standards, “National Emission Standards for Hazardous Air Pollutants for Reciprocating Internal Combustion Engines,” also known as RICE NESHAP, scheduled to be adopted in 2013. The rule will require capital expenditures over the next three years for the purchase and installation of new emissions-control equipment. We do not expect these expenditures to have a material impact on our results of operations, financial position or cash flows.

Finally, while the TCEQ has been delegated primary responsibility for implementing federal environmental programs under the Clean Air Act and Clean Water Act in Texas, the EPA retains program oversight. Recently, an apparent disagreement has arisen between TCEQ and the EPA over key aspects of these Texas regulatory programs (including among others, air and new source review permitting). This disagreement has led to increased EPA scrutiny of TCEQ’s environmental permitting decisions and uncertainty about how these programs will be administered in the future.

Superfund - The Comprehensive Environmental Response, Compensation and Liability Act, also known as CERCLA or Superfund, imposes liability, without regard to fault or the legality of the original act, on certain classes of persons who contributed to the release of a hazardous substance into the environment. These persons include the owner or operator of a facility where the release occurred and companies that disposed or arranged for the disposal of the hazardous substances found at the facility. Under CERCLA, these persons may be liable for the costs of cleaning up the hazardous substances released into the environment, damages to natural resources and the costs of certain health studies. We do not expect our current responsibilities under CERCLA, if any, to have a material impact on our results of operations, financial position or cash flows.

Chemical Site Security - The United States Department of Homeland Security (Homeland Security) released an interim rule in April 2007 that requires companies to provide reports on sites where certain chemicals, including many hydrocarbon products, are stored. We completed the Homeland Security assessments, and our facilities were subsequently assigned one of four risk-based tiers ranging from high (Tier 1) to low (Tier 4) risk, or not tiered at all due to low risk. To date, four of our facilities have been given a Tier 4 rating. Facilities receiving a Tier 4 rating are required to complete Site Security Plans and possible physical security enhancements. We do not expect the Site Security Plans and possible security enhancements cost to have a material impact on our results of operations, financial position or cash flows.

Pipeline Security - Homeland Security’s Transportation Security Administration, along with the United States Department of Transportation have completed a review and inspection of our “critical facilities” and identified no material security issues.

Environmental Footprint - Our environmental and climate change strategy focuses on taking steps to minimize the impact of our operations on the environment. These strategies include: (i) developing and maintaining an accurate greenhouse gas emissions inventory, according to current rules issued by the EPA; (ii) improving the efficiency of our various pipelines, natural gas processing facilities and natural gas liquids fractionation facilities; (iii) following developing technologies for emission control; and (iv) following developing technologies to capture carbon dioxide to keep it from reaching the atmosphere.

ONEOK Partners participates in the EPA’s Natural Gas STAR Program to voluntarily reduce methane emissions. In 2010, ONEOK Partners was recognized as the EPA’s “Natural Gas STAR Gathering and Processing Partner of Year” for its efforts to positively address environmental issues through voluntary implementation of emission-reduction opportunities in its gathering and processing business. In addition, ONEOK Partners received a Continuing Excellence award for five years of active participation in the STAR Program, including consistent reporting of emission-reduction activities, by its natural gas pipelines business. We continue to focus on maintaining low rates of lost-and-unaccounted-for natural gas through expanded implementation of best practices to limit the release of natural gas during pipeline and facility maintenance and operations. Our most recent calculation of our annual lost-and-unaccounted-for natural gas, for all of our business operations, is less than 1 percent of total throughput. We expect to complete our annual estimate for 2010 during the second quarter of 2011 and will post the information on our website when available.

Table of Contents

FORWARD-LOOKING STATEMENTS

Some of the statements contained and incorporated in this Quarterly Report are forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. The forward-looking statements relate to our anticipated financial performance, liquidity, management’s plans and objectives for our future operations, our business prospects, the outcome of regulatory and legal proceedings, market conditions and other matters. We make these forward-looking statements in reliance on the safe harbor protections provided under the Private Securities Litigation Reform Act of 1995. The following discussion is intended to identify important factors that could cause future outcomes to differ materially from those set forth in the forward-looking statements.

Forward-looking statements include the items identified in the preceding paragraph, the information concerning possible or assumed future results of our operations and other statements contained or incorporated in this Quarterly Report identified by words such as “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” “should,” “goal,” “forecast,” “guidance,” “could,” “may,” “continue,” “might,” “potential,” “scheduled,” and other words and terms of similar meaning.

One should not place undue reliance on forward-looking statements, which are applicable only as of the date of this Quarterly Report. Known and unknown risks, uncertainties and other factors may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by forward-looking statements. Those factors may affect our operations, markets, products, services and prices. In addition to any assumptions and other factors referred to specifically in connection with the forward-looking statements, factors that could cause our actual results to differ materially from those contemplated in any forward-looking statement include, among others, the following:

·	the effects of weather and other natural phenomena, including climate change, on our operations, including energy sales and demand for our services and energy prices;

·	competition from other United States and foreign energy suppliers and transporters, as well as alternative forms of energy, including, but not limited to, solar power, wind power, geothermal energy and biofuels such as ethanol and biodiesel;

·	the status of deregulation of retail natural gas distribution;

·	the capital intensive nature of our businesses;

·	the profitability of assets or businesses acquired or constructed by us;

·	our ability to make cost-saving changes in operations;

·	risks of marketing, trading and hedging activities, including the risks of changes in energy prices or the financial condition of our counterparties;

·	the uncertainty of estimates, including accruals and costs of environmental remediation;

·	the timing and extent of changes in energy commodity prices;

·	the effects of changes in governmental policies and regulatory actions, including changes with respect to income and other taxes, environmental compliance, climate change initiatives and authorized rates of recovery of natural gas and natural gas transportation costs;

the impact on drilling and production by factors beyond our control, including the demand for natural gas and crude oil; producers’ desire and ability to obtain necessary permits; reserve performance; and capacity constraints on the pipelines that transport crude oil, natural gas and NGLs from producing areas and our facilities;

·	changes in demand for the use of natural gas because of market conditions caused by concerns about global warming;

·	the impact of unforeseen changes in interest rates, equity markets, inflation rates, economic recession and other external factors over which we have no control, including the effect on pension and postretirement expense and funding resulting from changes in stock and bond market returns;

·	our indebtedness could make us vulnerable to general adverse economic and industry conditions, limit our ability to borrow additional funds and/or place us at competitive disadvantages compared with our competitors that have less debt, or have other adverse consequences;

·	actions by rating agencies concerning the credit ratings of ONEOK and ONEOK Partners;

the results of administrative proceedings and litigation, regulatory actions, rule changes and receipt of expected clearances involving the OCC, KCC, Texas regulatory authorities or any other local, state or federal regulatory body, including the FERC, the Pipeline and Hazardous Materials Safety Administration and the EPA;

·	our ability to access capital at competitive rates or on terms acceptable to us;

·	risks associated with adequate supply to our gathering, processing, fractionation and pipeline facilities, including production declines that outpace new drilling;

·	the risk that material weaknesses or significant deficiencies in our internal controls over financial reporting could emerge or that minor problems could become significant;

Table of Contents

·	the impact and outcome of pending and future litigation;

·	the ability to market pipeline capacity on favorable terms, including the effects of:

-	future demand for and prices of natural gas and NGLs;

-	competitive conditions in the overall energy market;

-	availability of supplies of Canadian and United States natural gas; and

-	availability of additional storage capacity;

·	performance of contractual obligations by our customers, service providers, contractors and shippers;

·	the timely receipt of approval by applicable governmental entities for construction and operation of our pipeline and other projects and required regulatory clearances;

our ability to acquire all necessary permits, consents or other approvals in a timely manner, to promptly obtain all necessary materials and supplies required for construction, and to construct gathering, processing, storage, fractionation and transportation facilities without labor or contractor problems;

·	the mechanical integrity of facilities operated;

·	demand for our services in the proximity of our facilities;

·	our ability to control operating costs;

·	adverse labor relations;

·	acts of nature, sabotage, terrorism or other similar acts that cause damage to our facilities or our suppliers’ or shippers’ facilities;

·	economic climate and growth in the geographic areas in which we do business;

·	the risk of a prolonged slowdown in growth or decline in the United States economy or the risk of delay in growth recovery in the United States economy, including liquidity risks in United States credit markets;

·	the impact of recently issued and future accounting updates and other changes in accounting policies;

·	the possibility of future terrorist attacks or the possibility or occurrence of an outbreak of, or changes in, hostilities or changes in the political conditions in the Middle East and elsewhere;

·	the risk of increased costs for insurance premiums, security or other items as a consequence of terrorist attacks;

·	risks associated with pending or possible acquisitions and dispositions, including our ability to finance or integrate any such acquisitions and any regulatory delay or conditions imposed by regulatory bodies in connection with any such acquisitions and dispositions;

·	the possible loss of natural gas distribution franchises or other adverse effects caused by the actions of municipalities;

·	the impact of unsold pipeline capacity being greater or less than expected;

·	the ability to recover operating costs and amounts equivalent to income taxes, costs of property, plant and equipment and regulatory assets in our state and FERC-regulated rates;

·	the composition and quality of the natural gas and NGLs we gather and process in our plants and transport on our pipelines;

·	the efficiency of our plants in processing natural gas and extracting and fractionating NGLs;

·	the impact of potential impairment charges;

·	the risk inherent in the use of information systems in our respective businesses, implementation of new software and hardware, and the impact on the timeliness of information for financial reporting;

·	our ability to control construction costs and completion schedules of our pipelines and other projects; and

·	the risk factors listed in the reports we have filed and may file with the SEC, which are incorporated by reference.

These factors are not necessarily all of the important factors that could cause actual results to differ materially from those expressed in any of our forward-looking statements. Other factors could also have material adverse effects on our future results. These and other risks are described in greater detail in Item 1A, Risk Factors, in our Annual Report. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by these factors. Other than as required under securities laws, we undertake no obligation to update publicly any forward-looking statement whether as a result of new information, subsequent events or change in circumstances, expectations or otherwise.

Table of Contents

ITEM 3.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our quantitative and qualitative disclosures about market risk are consistent with those discussed in Part II, Item 7A, Quantitative and Qualitative Disclosures About Market Risk in our Annual Report.

COMMODITY PRICE RISK

See Note C of the Notes to Consolidated Financial Statements and the discussion under ONEOK Partners’ “Commodity Price Risk” in Item 2, Management’s Discussion and Analysis of Financial Condition and Results of Operations, in this Quarterly Report for information on our hedging activities.

Energy Services

Fair Value Component of the Energy Marketing and Risk Management Assets and Liabilities - The following table sets forth the fair value component of the energy marketing and risk management assets and liabilities, excluding $31.0 million and $101.1 million of net assets at March 31, 2011, and December 31, 2010, respectively, from derivative instruments declared as either fair value or cash flow hedges for the periods indicated:

Fair Value Component of Energy Marketing and Risk Management Assets and Liabilities
	(Thousands of dollars)
Net fair value of derivatives outstanding at December 31, 2010	$	8,441
Derivatives reclassified or otherwise settled during the period		(1,757	)
Fair value of new derivatives entered into during the period		3,069
Other changes in fair value		(6,273	)
Net fair value of derivatives outstanding at March 31, 2011 (a)	$	3,480
(a) - The maturities of derivatives are based on injection and withdrawal periods from April through March, which is consistent with our business strategy. The maturities are as follows: $2.9 million matures through March 2012 and $0.5 million matures through March 2015.

The change in the net fair value of derivatives outstanding includes the effect of settled energy contracts and current period changes resulting primarily from newly originated transactions and the impact of market movements on the fair value of energy marketing and risk management assets and liabilities.

For further discussion of derivative instruments and fair value measurements, see the “Estimates and Critical Accounting Policies” section of Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Annual Report. Also, see Notes B and C of the Notes to Consolidated Financial Statements in this Quarterly Report.

Value-at-Risk (VAR) Disclosure of Commodity Price Risk - The potential impact on our future earnings, as measured by VAR, was $4.6 million and $5.8 million at March 31, 2011 and 2010, respectively. The following table sets forth the average, high and low VAR calculations for the periods indicated:

	Three Months Ended
	March 31,
Value-at-Risk	2011		2010
	(Millions of dollars)
Average	$	3.2	$	6.4
High	$	4.9	$	9.6
Low	$	2.0	$	3.9

Our VAR calculation includes derivatives, executory storage and transportation agreements and their related hedges. The variations in the VAR data are reflective of market volatility and changes in the portfolios during the year. The decrease in VAR for March 31, 2011, compared with March 31, 2010, is due to lower average commodity prices and decreased price volatility in 2011.

To the extent open commodity positions exist, fluctuating commodity prices can impact our financial results and financial position either favorably or unfavorably. As a result, we cannot predict with precision the impact risk management decisions may have on our business, operating results or financial position.

Table of Contents

ITEM 4.

CONTROLS AND PROCEDURES

Quarterly Evaluation of Disclosure Controls and Procedures - Our Chief Executive Officer (Principal Executive Officer) and Chief Financial Officer (Principal Financial Officer) have concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report based on the evaluation of the controls and procedures required by Rules 13a-15(b) of the Exchange Act.

Changes in Internal Controls Over Financial Reporting - There have been no changes in our internal control over financial reporting during the first quarter ended March 31, 2011, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II - OTHER INFORMATION

ITEM 1.

LEGAL PROCEEDINGS

Information about our legal proceedings is included under Part I, Item 3, Legal Proceedings, in our Annual Report.

ITEM 1A.

RISK FACTORS

Our investors should consider the risks set forth in Part I, Item 1A, Risk Factors of our Annual Report that could affect us and our business. Although we have tried to discuss key factors, our investors need to be aware that other risks may prove to be important in the future. New risks may emerge at any time, and we cannot predict such risks or estimate the extent to which they may affect our financial performance. Investors should carefully consider the discussion of risks and the other information included or incorporated by reference in this Quarterly Report, including “Forward-Looking Statements,” which are included in Part I, Item 2, Management’s Discussion and Analysis of Financial Condition and Results of Operations.

ITEM 2.

UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following table sets forth information relating to our purchases of our common stock for the periods indicated:

Period	Total Number of Shares Purchased		Average Price Paid per Share	Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs		Maximum Number (or Approximate Dollar Value) of Shares (or Units) that May Be Purchased Under the Plans or Programs

January 1-31, 2011	9,622	(a), (b)	$19.16		-		-
February 1-28, 2011	13,548	(a), (b)	$29.94		-		-
March 1-31, 2011	9,375	(a), (b)	$23.02		-		-
Total	32,545		$24.76		-		-

(a) - Includes shares withheld pursuant to attestation of ownership and deemed tendered to us in connection with the
exercise of stock options under the ONEOK, Inc. Long-Term Incentive Plan, as follows:
9,408 shares for the period of January 1-31, 2011
13,180 shares for the period of February 1-28, 2011
9,197 shares for the period of March 1-31, 2011

(b) - Includes shares repurchased directly from employees, pursuant to our Employee Stock Award Program, as follows:
214 shares for the period of January 1-31, 2011
368 shares for the period of February 1-28, 2011
178 shares for the period of March 1-31, 2011

ITEM 3.

DEFAULTS UPON SENIOR SECURITIES

Not Applicable.

Table of Contents

ITEM 4.

(REMOVED AND RESERVED)

Not Applicable.

ITEM 5.

OTHER INFORMATION

Not Applicable.

ITEM 6.

EXHIBITS

Readers of this report should not rely on or assume the accuracy of any representation or warranty or the validity of any opinion contained in any agreement filed as an exhibit to this Quarterly Report, because such representation, warranty or opinion may be subject to exceptions and qualifications contained in separate disclosure schedules, may represent an allocation of risk between parties in the particular transaction, may be qualified by materiality standards that differ from what may be viewed as material for securities law purposes, or may no longer continue to be true as of any given date. All exhibits attached to this Quarterly Report are included for the purpose of complying with requirements of the SEC. Other than the certifications made by our officers pursuant to the Sarbanes-Oxley Act of 2002 included as exhibits to this Quarterly Report, all exhibits are included only to provide information to investors regarding their respective terms and should not be relied upon as constituting or providing any factual disclosures about us, any other persons, any state of affairs or other matters.

The following exhibits are filed as part of this Quarterly Report:

Exhibit No. Exhibit Description

4.1

Second Amended and Restated Rights Agreement, dated as of March 31, 2011, between ONEOK, Inc. and Wells Fargo Bank, N.A. as Rights Agent.

10.1

Credit Agreement, dated as of April 5, 2011, among ONEOK, Inc., as borrower, the lenders party thereto, Bank of America, N.A., as administrative agent, swing line lender, and a letter of credit issuer, and JPMorgan Chase Bank, N.A. and The Royal Bank of Scotland plc, as letter of credit issuers (incorporated by reference from Exhibit 10.1 to ONEOK Inc.’s Current Report on Form 8-K filed on April 7, 2011 (File No. 001-13643)).

10.2

Form of Restricted Unit Stock Bonus Award Agreement (incorporated by reference from Exhibit 10.59 to Form 10-K for the fiscal year ended December 31, 2010, filed February 22, 2011).

10.3

Form of Performance Unit Award Agreement (incorporated by reference from Exhibit 10.60 to Form 10-K for the fiscal year ended December 31, 2010, filed February 22, 2011).

31.1

Certification of John W. Gibson pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

31.2

Certification of Robert F. Martinovich pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

32.1

Certification of John W. Gibson pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule 13a-14(b)).

32.2

Certification of Robert F. Martinovich pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule 13a-14(b)).

101.INS

XBRL Instance Document

101.SCH

XBRL Taxonomy Extension Schema Document

101.CAL

XBRL Taxonomy Calculation Linkbase Document

101.DEF

XBRL Taxonomy Extension Definitions Document

101.LAB

XBRL Taxonomy Label Linkbase Document

101.PRE

XBRL Taxonomy Presentation Linkbase Document

Table of Contents

Attached as Exhibit 101 to this Quarterly Report are the following documents formatted in XBRL: (i) Document and Entity Information; (ii) Consolidated Statements of Income for the three months ended March 31, 2011 and 2010; (iii) Consolidated Balance Sheets at March 31, 2011 and December 31, 2010; (iv) Consolidated Statements of Cash Flows for the three months ended March 31, 2011 and 2010; (v) Consolidated Statement of Changes in Equity for the three months ended March 31, 2011; (vi) Consolidated Statements of Comprehensive Income for the three months ended March 31, 2011 and 2010; and (vii) Notes to Consolidated Financial Statements.

Users of this data are advised pursuant to Rule 401 of Regulation S-T that the information contained in the XBRL documents is unaudited, and these XBRL documents are not the official publicly filed consolidated financial statements of ONEOK, Inc. The purpose of submitting these XBRL formatted documents is to test the related format and technology, and as a result, investors should continue to rely on the official filed version of the furnished documents and not rely on this information in making investment decisions.

In accordance with Rule 402 of Regulation S-T, the XBRL related information in Exhibit 101 to this Quarterly Report shall not be deemed to be “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in such filing. We also make available on our website the Interactive Data Files submitted as Exhibit 101 to this Quarterly Report.

Table of Contents

SIGNATURE

Pursuant to the requirements of the Exchange Act, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	ONEOK, Inc. Registrant
Date: May 4, 2011	By:	/s/ Robert F. Martinovich
		Robert F. Martinovich Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)