ONEOK Partners Reports Higher First-quarter 2007 Results; Reaffirms 2007 Guidance

April 26, 2007

TULSA, Okla., April 26, 2007 /PRNewswire-FirstCall via COMTEX News Network/ -- ONEOK Partners, L.P. (NYSE: OKS) today reported first-quarter 2007 net income of $95.8 million, or $1.00 per unit, compared with net income of $70.5 million, or 67 cents per unit, for the first quarter 2006. Operating income for the first quarter 2007 was $104.4 million compared with $100.2 million for the first quarter 2006.

The partnership also reaffirmed its 2007 net income per unit guidance, announced on March 22, 2007, to be in the range of $3.06 to $3.46 per unit. The partnership's distributable cash flow is expected to be in the range of $370 million to $404 million, or $3.91 to $4.32 per unit. The average number of units outstanding for 2007 is still expected to be 82.9 million, compared with 73.8 million in 2006.

Cash flow, as measured by earnings before interest, taxes, depreciation and amortization (EBITDA), was $157.2 million for the first quarter 2007, compared with $160.1 million in the first quarter 2006. Distributable cash flow (DCF) for the first quarter 2007 was $116.8 million, or $1.25 per unit, compared with $52.9 million, or $1.05 per unit, in the first quarter 2006.

First-quarter 2007 results reflect increased margins in the partnership's natural gas liquids segment as a result of higher product price spreads between Mont Belvieu, Texas, and Conway, Kan., as well as volume growth due to both new supply connections and improved natural gas processing economics. These results were partially offset by lower processed volumes in the gathering and processing segment, due to anticipated contract terminations.

"Our performance reflects the continuing growth of our natural gas liquids business," said John W. Gibson, president and chief executive officer of ONEOK Partners. "Growth in natural gas liquids supply volumes and the need for additional infrastructure have led us to invest further in this important industry sector.

"During the first quarter, we announced two more natural gas liquids pipelines -- the Arbuckle and Piceance lateral pipelines -- along with expansions to existing natural gas gathering and processing facilities. These investments are part of our $1.5 billion in internally generated growth projects, which will benefit the partnership's future earnings and cash flow performance," Gibson added.

Results for 2006 are reported as if the April 2006 transaction in which ONEOK Partners purchased assets from ONEOK had occurred on Jan. 1, 2006.

    FIRST-QUARTER 2007 HIGHLIGHTS INCLUDE:

     *  Operating income of $104.4 million, compared with $100.2 million in
        the first quarter last year;
     *  Gathering and processing segment operating income of $30.5 million,
        compared with $46.9 million in the first quarter 2006;
     *  Natural gas liquids segment operating income of $32.0 million,
        compared with $17.1 million in the first quarter 2006;
     *  Pipelines and storage segment operating income of $28.1 million,
        compared with $28.7 million in the first quarter 2006;
     *  Interstate natural gas pipelines segment operating income of
        $12.9 million, compared with $13.1 million in the first quarter 2006;
     *  Equity earnings from investments of $24.1 million, compared with
        $31.6 million in the first quarter 2006;
     *  Capital expenditures increasing to $77.9 million, compared with $17.7
        in the first quarter 2006, primarily due to internally generated
        growth activities;
     *  Increasing the quarterly distribution twice in 2007 to 99 cents per
        unit, marking the fifth consecutive quarter to raise the distribution;
     *  Announcing the $260 million, 440-mile natural gas liquids Arbuckle
        Pipeline from southern Oklahoma through northern Texas and continuing
        on to the Texas Gulf Coast;
     *  Announcing a $120 million, 150-mile lateral pipeline from the Piceance
        Basin to the previously announced Overland Pass Pipeline;
     *  A $30 million expansion of the partnership's largest natural gas
        processing facility in the Williston Basin that will increase capacity
        by approximately 60 percent;
     *  Doubling the existing gathering pipeline capacity of Fort Union Gas
        Gathering, L.L.C., in which a ONEOK Partners subsidiary has a
        37 percent interest; located in the Powder River Basin, the
        $110 million project adds 148 miles of new gathering lines and
        649 million cubic feet per day (MMcf/d) of additional capacity; and
     *  Effective April 1, 2007, transferring operating responsibility of
        Northern Border Pipeline to an affiliate of TransCanada.  In addition,
        the transition of ONEOK Partners' functions previously located in
        Omaha, Neb., to the Tulsa, Okla., headquarters was completed.

    FIRST-QUARTER BUSINESS UNIT RESULTS

Gathering and Processing Segment

The gathering and processing segment reported EBITDA of $47.4 million in the first quarter 2007, compared with $63.1 million in the same period a year earlier. Operating income for first quarter 2007 was $30.5 million, compared with $46.9 million for first quarter 2006.

Net margins were $73.4 million, compared with $88.6 million in the same period last year. The $15.2 million margin decrease was primarily the result of $11.2 million in lower realized commodity prices on percent-of-proceeds contracts; $7.0 million from lower volumes processed, primarily due to anticipated contract terminations; $1.0 million in lower volumes caused by weather-related outages in the Mid-Continent; partially offset by $4.1 million in higher gathering fees.

Operating costs for the segment were $34.0 million, an increase of $2.5 million from the same period in 2006, primarily due to increased employee-related expenses.

The following table contains margin information for the periods indicated. NGL shrink, plant fuel and condensate shrink refer to the Btus that are removed from natural gas through the gathering and processing operation.

                                                       Three Months Ended
                                                            March 31,
                                                     2007              2006
     Keep-whole
      NGL shrink (MMBtu/d)                          22,018            40,968
      Plant fuel (MMBtu/d)                           2,689             5,144
      Condensate shrink (MMBtu/d)                    2,215             3,403
      Condensate sales (Bbl/d)                         448               699
      Percentage of total net margin                     6%               11%
     Percent of proceeds
      Wellhead purchases (MMBtu/d)                  90,636           129,813
      NGL sales (Bbl/d)                              6,095             6,932
      Residue sales (MMBtu/d)                       30,294            28,334
      Condensate sales (Bbl/d)                       1,122             1,093
      Percentage of total net margin                    61%               62%
     Fee-based
      Wellhead volumes (MMBtu/d)                 1,167,714         1,144,677
      Average rate ($/MMBtu)                         $0.24             $0.23
      Percentage of total net margin                    33%               27%


The first-quarter 2007 realized gross processing spread was $3.59 per MMBtu, compared with $3.43 per MMBtu for the same period in 2006. Based on current market conditions, the gross processing spread for the remainder of 2007 is expected to be above the five-year average, which is $2.55 per MMBtu.

The gathering and processing segment is exposed to commodity price risk primarily as a result of revenue from the sale of commodities received in exchange for services. The following table provides gathering and processing hedging information for 2007 and 2008:

                                                  Nine Months Ending
                                                   December 31, 2007

                                          Volumes    Average Price     Volumes
    Product                                Hedged       Per Unit        Hedged
    Commodity Risk
      Natural gas liquids (Bbl/d) [a]       2,692     $0.85 ($/gallon)    43%
    Spread Risk
      Gross processing spread (MMBtu/d)[a]  6,391     $2.98 ($/MMBtu)     28%
      Natural gas liquids (Bbl/d) [a]       1,647[b]  $0.79 ($/gallon)    24%

    [a]  Hedged with fixed-price swaps
    [b]  5,538 MMBtu/d equivalent

                                                      Year Ending
                                                   December 31, 2008

    Product                               Volumes    Average Price     Volumes
                                          Hedged       Per Unit        Hedged
    Commodity Risk
      Natural gas liquids (Bbl/d) [a]       503      $0.89 ($/gallon)    8%
    Spread Risk
      Natural gas liquids (Bbl/d) [a]       559[b]   $0.82 ($/gallon)    9%

    [a]  Hedged with fixed-price swaps
    [b]  1,796 MMBtu/d equivalent


For 2007, the partnership estimates that a 10 cent per MMBtu increase in the price of natural gas would increase annual net margin by approximately $0.2 million. Also, a 1 cent per gallon increase in the price of natural gas liquids would increase annual net margin by approximately $1.9 million. A $1.00 per barrel increase in the price of crude oil would increase annual net margin by approximately $0.5 million. All these sensitivities exclude the effects of hedging.

Natural Gas Liquids Segment

The natural gas liquids segment reported EBITDA of $37.7 million in the first quarter 2007, compared with $22.4 million in the same period last year. Operating income for first quarter 2007 was $32.0 million compared with $17.1 million in the first quarter 2006.

Net margins increased to $52.1 million, compared with $33.7 million for the same period last year. The increase was primarily the result of $11.3 million in increased margins as a result of higher product price spreads between Mont Belvieu, Texas, and Conway, Kan., wider price spreads between ethane and propane, and increased natural gasoline sales related to ethanol production; $4.7 million in higher margins as a result of new supply connections and improved natural gas processing economics; and $2.3 million in new storage contracts and the acquisition of the Mont Belvieu storage business in the fourth quarter of 2006.

The Conway-to-Mont Belvieu Oil Price Information Service (OPIS) average spread for the first quarter 2007 for ethane/propane mix was 5.7 cents per gallon, compared with 3.5 cents per gallon in the same period last year.

Operating costs increased $3.5 million in the first quarter 2007, compared with first quarter 2006, primarily due to increased employee-related expenses and general taxes, as well as costs associated with operating the Mont Belvieu storage business, which was acquired in the fourth quarter of 2006.

Pipelines and Storage Segment

The pipelines and storage segment reported first quarter 2007 EBITDA of $36.2 million, compared with $36.9 million in the same period last year. Operating income for the first quarter 2007 was $28.1 million, compared with $28.7 million for the first quarter 2006.

Net margins were $54.7 million in the first quarter 2007, compared with $52.1 million in the first quarter of 2006, due primarily to increased margins from the segment's natural gas liquids gathering and distribution pipelines, which experienced increased volumes gathered and increased volumes transported between Conway, Kan., and Mont Belvieu, Texas.

Operating costs increased $2.1 million, primarily related to increased employee-related expenses and increased general taxes.

Interstate Natural Gas Pipelines Segment

The interstate natural gas pipelines segment reported first-quarter 2007 EBITDA of $34.3 million, compared with $43.0 million for the same period in 2006. Operating income for the first quarter 2007 was $12.9 million, compared with $13.1 million for the first quarter 2006.

Net margins were $23.6 million in the first quarter 2007, compared with $25.6 million in the same period last year, as a result of lower throughput on Midwestern Gas Transmission.

Equity earnings from investments were $18.0 million, compared with $26.1 million in the first quarter 2006. The $8.1 million decrease is due to a reduced interest in Northern Border Pipeline. In April 2006, the partnership completed the sale of a 20 percent partnership interest in Northern Border Pipeline to TC PipeLines, reducing ONEOK Partners' ownership in the pipeline to 50 percent.

GROWTH ACTIVITIES

The partnership has announced that it will invest more than $1.5 billion in internally generated growth projects over the next three years. The projects include $433 million to build the Overland Pass Pipeline and another $216 million to make infrastructure upgrades in the partnership's existing natural gas liquids operations.

Additional investments are being made in the $250 million, 110-mile Guardian Pipeline expansion and extension project, which has a targeted in- service date of November 2008, and in the $41 million, 31-mile Midwestern Gas Transmission extension project, which is expected to be in service in the fourth quarter 2007.

During the first quarter 2007, the partnership announced additional internally generated growth projects that include:

     *  A $260 million natural gas liquids pipeline from southern Oklahoma
        through the Barnett Shale natural gas play in northern Texas and
        continuing on to the Texas Gulf Coast. The proposed 440-mile Arbuckle
        Pipeline will originate in Stephens County, Okla., and be designed to
        initially transport 160,000 barrels per day of raw natural gas liquids
        for delivery to Mont Belvieu, Texas, market center. The proposed
        pipeline will interconnect with ONEOK Partners' existing fractionation
        facility at Mont Belvieu and with other Gulf Coast-area fractionators.
        Construction on the 12- and 16-inch pipeline is currently expected to
        be complete by early 2009.

     *  Overland Pass Pipeline Company, L.L.C., a joint venture with Williams,
        plans to build a $120 million natural gas liquids pipeline lateral
        connecting the growing Piceance Basin in northwestern Colorado with
        the previously announced Overland Pass Pipeline. The 150-mile lateral
        pipeline is designed to transport as much as 100,000 barrels per day
        of raw natural gas liquids from the Piceance Basin to the 750-mile
        Overland Pass Pipeline, which will extend from Opal, Wyo., to the Mid-
        Continent natural gas liquids hub in Conway, Kan. The proposed
        pipeline lateral will transport liquids from an existing Williams
        natural gas processing plant and a new processing plant that Williams
        plans to build and operate in the Piceance Basin. Construction on the
        14-inch lateral pipeline is currently expected to begin in the summer
        of 2008 with start-up scheduled for early 2009.

     *  A $30 million expansion to its Grasslands natural gas processing
        facility in McKenzie County, N.D., that will increase capacity by
        approximately 60 percent. The Grasslands processing facility, the
        partnership's largest natural gas processing plant in the Williston
        Basin, is owned and operated by ONEOK Partners' wholly owned
        subsidiary Bear Paw Energy, L.L.C. The plant expansion, which is
        already under way, will increase natural gas processing capacity to
        approximately 100 million cubic feet per day (MMcf/d) from its current
        capacity of approximately 63 MMcf/d. As part of the project, the
        plant's fractionation equipment will be expanded, increasing
        fractionating capacity by 65 percent. The additions will come on line
        in phases starting in the summer of 2007 through the first quarter of
        2008.

     *  Fort Union Gas Gathering, L.L.C. doubled its existing gathering
        pipeline capacity by adding 148 miles of new gathering lines and
        649 million cubic feet per day (MMcf/d) of additional capacity.  ONEOK
        Partners' subsidiary, Crestone Powder River, L.L.C., has a 37 percent
        interest in Fort Union Gas Gathering, L.L.C.  The Fort Union Gas
        gathering system is located in the Powder River basin and gathers coal
        bed methane gas from wells in northeast Wyoming. The $110 million
        expansion will be project financed within the Fort Union Gas Gathering
        partnership and is currently expected to occur in two phases:
        240 MMcf/d by the fourth quarter of 2007 and 409 MMcf/d by the first
        quarter of 2008.

DISTRIBUTION DECLARATION

On April 17, 2007, the board of directors of ONEOK Partners, L.P. declared an increase in the partnership's quarterly cash distribution to 99 cents per unit for the first quarter of 2007. The indicated annual rate is $3.96 per unit. The distribution is payable May 14, 2007, to unitholders of record on April 30, 2007. This is the fifth consecutive quarter in which an increase has been declared.

SPECIAL MEETING AND PROXY VOTE

On March 29, 2007, ONEOK Partners, L.P. announced that the proposal to permit the conversion of the Class B units held by ONEOK, Inc. into common units has been approved by the required majority of common unitholders. The partnership also announced that it had adjourned its special meeting of common unitholders until 10 a.m. Central Daylight Time on May 10, 2007, when the meeting will reconvene.

The adjournment is designed to give unitholders additional time to submit their proxy on the proposal to amend the ONEOK Partners' partnership agreement, which requires the approval of at least two-thirds of the outstanding common units, excluding the common units and Class B units held by ONEOK, Inc. and its affiliates.

ONEOK Partners has filed a proxy statement and other documents with the Securities and Exchange Commission. Investors are urged to read carefully the proxy statement because it contains important information regarding the amendment proposal. A copy of the proxy statement can be obtained without charge, by contacting D.F. King & Co., Inc., which is assisting ONEOK Partners, toll-free at 1-800-549-6746.

ONEOK Partners unitholders who have questions regarding the proposal or need assistance voting their common units should contact D.F. King & Co., which is acting as information agent for ONEOK Partners, as follows:

     D.F. King & Co., Inc.
     48 Wall Street
     New York, New York 10005
     Toll-Free: 1-800-549-6746
     Call Collect:  1-212-269-5550

CONFERENCE CALL AND WEBCAST

ONEOK Partners and ONEOK management will conduct a joint conference call on Friday, April 27, 2007, at 11 a.m. Eastern Daylight Time (10 a.m. Central Daylight Time). The call will also be carried live on ONEOK Partners' and ONEOK's Web sites.

To participate in the telephone conference call, dial 866-837-9782, pass code 1065012, or log on to http://www.oneokpartners.com or http://www.oneok.com .

If you are unable to participate in the conference call or the webcast, the replay will be available on ONEOK Partners' Web site, http://www.oneokpartners.com, and ONEOK's Web site, http://www.oneok.com, for 30 days. A recording will be available by phone for seven days. The playback call may be accessed at 866-837-8032, pass code 696102.

NON-GAAP FINANCIAL MEASURES

The partnership has disclosed in this news release EBITDA and DCF amounts that are non-GAAP financial measures. Management believes EBITDA and DCF provide useful information to investors as a measure of comparison with peer companies. However, these calculations may vary from company to company, so the partnership's computations may not be comparable with those of other companies. DCF is not necessarily the same as available cash as defined in the Partnership Agreements. Management further uses EBITDA to compare the financial performance of its segments and to internally manage those business segments. Reconciliations of EBITDA to operating income, and computations of DCF are included in the financial tables attached to this release.

ONEOK Partners, L.P. (NYSE: OKS) is one of the largest publicly traded limited partnerships, and is a leader in the gathering, processing, storage and transportation of natural gas in the U.S. and owns one of the nation's premier natural gas liquids (NGL) systems, connecting much of the natural gas and NGL supply in the Mid-Continent with key market centers. Its general partner is ONEOK, Inc. (NYSE: OKE), a diversified energy company, which owns 45.7 percent of the overall partnership interest. ONEOK is one of the largest natural gas distributors in the United States, and its energy services operation focuses primarily on marketing natural gas and related services throughout the U.S.

For more information, visit the Web sites at http://www.oneokpartners.com or http://www.oneok.com .

Some of the statements contained and incorporated in this news release are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The forward-looking statements relate to our anticipated financial performance, management's plans and objectives for our future operations, our business prospects, the outcome of regulatory and legal proceedings, market conditions and other matters. The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements in certain circumstances. 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 news release identified by words such as "anticipate," "estimate," "expect," "project," "intend," "plan," "believe," "should," "goal," "forecast" or other similar phrases.

You should not place undue reliance on forward-looking statements. 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 on our operations,
        demand for our services and energy prices;
     *  competition from other United States and Canadian energy suppliers and
        transporters as well as alternative forms of energy;
     *  the timing and extent of changes in commodity prices for natural gas,
        NGLs, electricity and crude oil;
     *  impact on drilling and production by factors beyond our control,
        including the demand for natural gas and refinery-grade 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;
     *  risks of trading and hedging activities as a result of changes in
        energy prices or the financial condition of our counterparties;
     *  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 rights-of-way permits and
        consents in a timely manner, to promptly obtain all necessary
        materials and supplies required for construction, and to construct
        pipelines without labor or contractor problems;
     *  our ability to control construction costs and completion schedules of
        our pipeline projects and other projects;
     *  the ability to market pipeline capacity on favorable terms;
     *  risks associated with adequate supply to our gathering, processing,
        fractionation and pipeline facilities, including production declines
        which outpace new drilling;
     *  the mechanical integrity of facilities operated;
     *  the effects of changes in governmental policies and regulatory
        actions, including changes with respect to income and other taxes,
        environmental compliance, authorized rates or recovery of gas costs;
     *  the results of administrative proceedings and litigation, regulatory
        actions and receipt of expected clearances involving regulatory
        authorities or any other local, state or federal regulatory body,
        including the FERC;
     *  actions by rating agencies concerning our credit ratings;
     *  the impact of unforeseen changes in interest rates, equity markets,
        inflation rates, economic recession and other external factors over
        which we have no control;
     *  our ability to access capital at competitive rates or on terms
        acceptable to us;
     *  demand for our services in the proximity of our facilities;
     *  the profitability of assets or businesses acquired by us;
     *  the risk that material weaknesses or significant deficiencies in our
        internal control over financial reporting could emerge or that minor
        problems could become significant;
     *  the impact and outcome of pending and future litigation;
     *  our ability to successfully integrate the operations of the assets
        acquired from ONEOK with our current operations;
     *  our ability to successfully transfer administrative functions of our
        interstate pipelines segment from Omaha to Tulsa;
     *  performance of contractual obligations by our customers;
     *  the uncertainty of estimates, including accruals;
     *  our ability to control operating costs; and
     *  acts of nature, sabotage, terrorism or other similar acts that cause
        damage to our facilities or our suppliers' or shippers' facilities.

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 under Part I, Item 1A, "Risk Factors," in our Annual Report on Form 10-K for the year ended December 31, 2006, available on the ONEOK Partners' Web site. 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.

Other factors and assumptions not identified above were also involved in the making of the forward-looking statements. The failure of those assumptions to be realized, as well as other factors, may also cause actual results to differ materially from those projected. We have no obligation and make no undertaking to update publicly or revise any forward-looking information.

    ONEOK Partners, L.P. and Subsidiaries
    CONSOLIDATED STATEMENTS OF INCOME
                                                      Three Months Ended
                                                          March 31,
    (Unaudited)                                    2007              2006
         (Thousands of dollars, except per unit amounts)
    Revenues
    Operating revenue                           $1,161,472        $1,169,830
    Cost of sales and fuel                         956,325           968,135
    Net Margin                                     205,147           201,695
    Operating Expenses
     Operations and maintenance                     66,453            68,579
     Depreciation and amortization                  27,513            27,470
     Taxes other than income                         9,008             6,777
    Total Operating Expenses                       102,974           102,826
    Gain on Sale of Assets                           2,203             1,305
    Operating Income                               104,376           100,174
    Interest expense, net                           32,300            36,434
    Other income (expense):
     Equity earnings from investments               24,055            31,641
     Other income                                    2,800             1,086
     Other expense                                    (213)             (150)
    Total Other Income, net                         26,642            32,577
    Minority interests in income of
     consolidated subsidiaries                          85             1,619
    Income before income taxes                      98,633            94,698
    Income taxes                                     2,877            24,194
    Net Income                                     $95,756           $70,504

    Limited partners' interest in net income:
    Net income                                     $95,756           $70,504
    General partners' interest in net income        13,278            39,640
      Limited Partners' Interest in Net Income     $82,478           $30,864

    Limited partners' per unit net income:
      Net income per unit                            $1.00             $0.67
    Number of Units Used in Computation
     (Thousands)                                    82,891            46,397

    Supplemental Information:
    EBITDA [1]                                    $157,194          $160,093
    Distributable cash flow [2]                   $116,792           $52,936
    Distributable cash flow per unit                 $1.25             $1.05

    [1] EBITDA is computed from net income plus minority interest, interest
        expense (net), income taxes, and depreciation and amortization; less
        equity AFUDC.
    [2] Distributable cash flow is computed from EBITDA less interest expense
        (net), maintenance capital expenditures, equity earnings, gain on sale
        of assets, distributions to minority interests and current income
        taxes; plus distributions received from equity investments.



    ONEOK Partners, L.P. and Subsidiaries
    CONSOLIDATED BALANCE SHEETS
                                                   March 31,      December 31,
    (Unaudited)                                      2007             2006
    Assets                                          (Thousands of dollars)

    Current Assets
      Cash and cash equivalents                    $93,020            $21,102
      Accounts receivable, net                     312,299            298,602
      Related party receivables                     62,827             88,572
      Gas and natural gas liquids in storage       182,549            198,141
      Commodity exchanges and imbalances            67,514             53,433
      Other                                         24,540             33,388
        Total Current Assets                       742,749            693,238

    Property, Plant and Equipment
      Property, plant and equipment              3,500,225          3,424,452
      Accumulated depreciation and amortization    686,378            660,804
       Net Property, Plant and Equipment         2,813,847          2,763,648

    Investments and Other Assets
      Investment in unconsolidated affiliates      746,383            748,879
      Goodwill and intangible assets               687,834            689,751
      Other                                         27,185             26,201
        Total Investments and Other Assets       1,461,402          1,464,831
        Total Assets                            $5,017,998         $4,921,717

    Liabilities and Partners' Equity

    Current Liabilities
      Current maturities of long-term debt         $11,931            $11,931
      Notes payable                                    ---              6,000
      Accounts payable                             447,106            361,967
      Related party payables                         7,368             25,737
      Commodity exchanges and imbalances           182,904            175,927
      Accrued interest                              55,316             29,366
      Other                                         63,735             60,105
        Total Current Liabilities                  768,360            671,033

    Long-term Debt, net of current maturities    2,019,502          2,019,598

    Minority Interests in Consolidated
     Subsidiaries                                    5,691              5,606

    Deferred Credits and Other Liabilities          37,599             36,818

    Commitments and Contingencies

    Partners' Equity
      General partner                               55,209             54,373
      Common units: 46,397,214 units issued
       and outstanding at March 31, 2007,
       and December 31, 2006                       804,294            803,599
      Class B units: 36,494,126 units
       issued and outstanding at
       March 31, 2007, and December 31, 2006     1,332,796          1,332,276
      Accumulated other comprehensive loss          (5,453)            (1,586)
      Total Partners' Equity                     2,186,846          2,188,662
      Total Liabilities and Partners' Equity    $5,017,998         $4,921,717



    ONEOK Partners, L.P. and Subsidiaries
    CONSOLIDATED STATEMENTS OF CASH FLOWS                Three Months Ended
                                                               March 31,
    (Unaudited)                                          2007           2006
                                                        (Thousands of dollars)
    Operating Activities
    Net income                                         $95,756        $70,504
    Depreciation and amortization                       27,513         27,470
    Minority interests in income
     of consolidated subsidiaries                           85          1,619
    Equity earnings from investments                   (24,055)       (31,641)
    Distributions received from
     unconsolidated affiliates                          26,455         40,708
    Gain on sale of assets                              (2,203)        (1,305)
    Changes in assets and liabilities
     (net of acquisition and disposition effects):
      Accounts receivable                               12,048         61,725
      Inventories                                       14,460         41,469
      Accounts payable and other current liabilities    66,770         55,598
      Commodity exchanges                               (7,104)       (26,070)
      Accrued taxes other than income                   (2,645)       (10,344)
      Accrued interest                                  25,950          1,431
      Derivative financial instruments                   1,410         (3,036)
      Other                                             11,474          7,038
      Cash Provided by Operating Activities            245,914        235,166

    Investing Activities
    Change in investments in unconsolidated affiliates    (141)        (5,713)
    Proceeds from sale of assets                         3,707            316
    Capital expenditures                               (77,857)       (17,657)
    Increase in cash and cash equivalents
      for previously unconsolidated subsidiaries           ---          7,496
    Decrease in cash and cash equivalents
     for previously consolidated subsidiaries              ---        (22,039)
      Cash Used in Investing Activities                (74,291)       (37,597)

    Financing Activities
    Cash distributions:
      General and limited partners                     (93,675)       (39,906)
      Minority interests                                   ---           (147)
    Cash flow retained by ONEOK                            ---       (176,940)
    Short term financing borrowings                        ---        237,000
    Short term financing payments                       (6,000)      (211,000)
    Debt reacquisition costs                               ---         (3,628)
    Issuance of long-term debt                             ---        211,000
    Retirement of long-term debt                           ---       (243,030)
    Other                                                  (30)          (179)
      Cash Used in Financing Activities                (99,705)      (226,830)
        Change in Cash and Cash Equivalents             71,918        (29,261)
        Cash and Cash Equivalents at Beginning
         of Period                                      21,102         43,090
        Cash and Cash Equivalents at End of Period     $93,020        $13,829
    Supplemental Cash Flow Information:
      Cash Paid for interest, net of amount capitalized $8,710         $9,220



    ONEOK Partners, L.P. and Subsidiaries
    INFORMATION AT A GLANCE
                                                           Quarters Ended
                                                               March 31,
    (Unaudited)                                             2007       2006
                (Millions of dollars, except per unit amounts)
    Gathering and Processing
    Net margin                                              $73.4      $88.6
    Operating costs                                         $34.0      $31.5
    Depreciation and amortization                           $11.1      $10.6
    Operating income                                        $30.5      $46.9
    Total gas gathered (BBtu/d)                             1,168      1,145
    Total gas processed (BBtu/d)                              609        931
    Natural gas liquids sales (MBbl/d)                         37         41
    Natural gas liquids produced (MBbl/d)                      39         51
    Natural gas sales (BBtu/d)                                268        308
    Realized composite NGL sales price ($/gallon)           $0.82      $0.87
    Realized condensate sales price ($/Bbl)                $56.53     $57.67
    Realized natural gas sales price ($/MMBtu)              $6.58      $7.99
    Realized gross processing spread ($/MMBtu)              $3.59      $3.43
    Capital expenditures - growth                           $15.2       $5.2
    Capital expenditures - maintenance                       $2.7       $2.6

    Natural Gas Liquids
    Net margin                                              $52.1      $33.7
    Operating costs                                         $14.7      $11.2
    Depreciation and amortization                            $5.3       $5.4
    Operating income                                        $32.0      $17.1
    Natural gas liquids gathered (MBbl/d)                     210        193
    Natural gas liquids sales (MBbl/d)                        220        208
    Natural gas liquids fractionated (MBbl/d)                 319        281
    Capital expenditures - growth                            $4.8       $0.9
    Capital expenditures - maintenance                       $2.7       $2.1

    Pipelines and Storage
    Net margin                                              $54.7      $52.1
    Operating costs                                         $18.9      $16.8
    Depreciation and amortization                            $7.8       $7.6
    Operating income                                        $28.1      $28.7
    Natural gas transported (MMcf/d)                        1,571      1,473
    Natural gas liquids transported (MBbl/d)                  205        193
    Natural gas liquids gathered (MBbl/d)                      71         55
    Capital expenditures - growth                           $34.5       $2.3
    Capital expenditures - maintenance                       $1.3       $1.3
    Average natural gas price
      Mid-continent region ($/MMBtu)                        $6.29      $7.23

    Interstate Natural Gas Pipelines
    Net margin                                              $23.6      $25.6
    Operating costs                                          $7.4       $8.7
    Depreciation and amortization                            $3.3       $3.7
    Operating income                                        $12.9      $13.1
    Equity earnings from investments                        $18.0      $26.1
    Natural gas transported (MMcf/d)                        1,028      1,051
    Natural gas average throughput (MMcf/d)                 1,040      1,065
    Capital expenditures - growth                           $16.6       $2.5
    Capital expenditures - maintenance                       $0.2       $0.5



    ONEOK Partners, L.P. and Subsidiaries
    RECONCILIATION OF EBITDA NON-GAAP FINANCIAL MEASURES

                                                        Quarters Ended
                                                            March 31,
    (Unaudited)                                       2007            2006
                                                    (Thousands of dollars)
    Reconciliation of Net Income to EBITDA
    Net income                                     $95,756           $70,504
    Minority interests                                  85             1,619
    Interest expense, net                           32,300            36,434
    Depreciation and amortization                   27,513            27,470
    Income taxes                                     2,877            24,194
    Equity AFUDC                                    (1,337)             (128)
      EBITDA                                      $157,194          $160,093

    Gathering and Processing
     Reconciliation of Operating Income to EBITDA
    Operating income                               $30,452           $46,852
    Depreciation and amortization                   11,122            10,567
    Equity earnings from investments                 5,608             5,422
    Other income (expense)                             243               274
      EBITDA                                       $47,425           $63,115

    Natural Gas Liquids Reconciliation of
     Operating Income to EBITDA
    Operating income                               $31,998           $17,125
    Depreciation and amortization                    5,332             5,399
    Equity earnings from investments                   279              (172)
    Other income (expense)                              41                35
      EBITDA                                       $37,650           $22,387

    Pipelines and Storage Reconciliation
     of Operating Income to EBITDA
    Operating income                               $28,063           $28,741
    Depreciation and amortization                    7,777             7,583
    Equity earnings from investments                   128               244
    Other income (expense)                           1,108               322
    Equity AFUDC                                      (904)              ---
      EBITDA                                       $36,172           $36,890

    Interstate Natural Gas Pipelines
     Reconciliation of Operating Income
     to EBITDA
    Operating income                               $12,934           $13,067
    Depreciation and amortization                    3,255             3,749
    Equity earnings from investments                18,040            26,147
    Other income (expense)                             494               175
    Equity AFUDC                                      (433)             (128)
      EBITDA                                       $34,290           $43,010



    ONEOK Partners, L.P. and Subsidiaries
    RECONCILIATION OF DISTRIBUTABLE CASH FLOW NON-GAAP FINANCIAL MEASURES

                                                       Quarters Ended
                                                           March 31,
    (Unaudited)                                     2007              2006
                                                    (Thousands of dollars,
                                                   except per unit amounts)
    Reconciliation of EBITDA to
     Distributable Cash Flow
    EBITDA                                        $157,194          $160,093
    Gain on sale of assets                          (2,203)           (1,305)
    Interest expense, net                          (32,300)          (36,434)
    Maintenance capital                             (6,825)           (6,955)
    Distributions to minority interest                 ---              (147)
    Equity earnings from investments               (24,055)          (31,641)
    Distributions received from investments         26,455            40,708
    Distributable cash flow to ONEOK for
     partial year ownership                            ---           (85,817)
    Current income tax expense and other            (1,474)           14,434
      Distributable Cash Flow                     $116,792           $52,936


    General Partners' Interest in
     Distributable Cash Flow                       (13,270)           (4,025)
    Distributable Cash Flow Available to
     Limited Partners                             $103,522           $48,911

    Distributable Cash Flow per Limited
     Partner Unit                                    $1.25             $1.05

    Average Units Outstanding                       82,891            46,397


     Analyst Contact:  Christy Williamson
                       918-588-7163
     Media Contact:    Megan Washbourne
                       918-588-7572

OKS-FE


SOURCE ONEOK Partners, L.P.

analysts, Christy Williamson, +1-918-588-7163, or media, Megan Washbourne,
+1-918-588-7572, both of ONEOK Partners, L.P.
http://www.oneok.com