ONEOK Partners Reports Higher First-quarter 2008 Results; Reaffirms 2008 Earnings Guidance

April 30, 2008

TULSA, Okla., April 30, 2008 /PRNewswire-FirstCall via COMTEX News Network/ -- ONEOK Partners, L.P. (NYSE: OKS) today announced that its first-quarter 2008 net income rose 51 percent to $145.0 million, or $1.48 per unit, compared with net income of $95.8 million, or $1.00 per unit, for the first quarter 2007. Operating income for the first quarter 2008 was $150.5 million, compared with $104.4 million for the first quarter 2007.

"While higher commodity prices contributed to the increase in first-quarter earnings, we also experienced volume growth across all four of the partnership's business segments," said John W. Gibson, chairman, president and chief executive officer of ONEOK Partners.

"During the first quarter we also completed equity offerings of 7.9 million common units for net proceeds of $443.6 million, enabling us to maintain our targeted capital structure and to fund our $1.6 billion in internally generated growth projects," Gibson added.

The partnership also reaffirmed its 2008 net income per unit guidance, announced on Jan. 8, 2008, to be in the range of $4.10 to $4.60 per unit. The partnership's distributable cash flow is expected to be in the range of $475 million to $525 million.

In the first quarter 2008, cash flow, as measured by earnings before interest, taxes, depreciation and amortization (EBITDA), rose 32 percent to $208.2 million, compared with $157.2 million in the first quarter 2007. Distributable cash flow (DCF) for the first quarter 2008 was $158.9 million, or $1.66 per unit, compared with $117.1 million, or $1.25 per unit, in the first quarter 2007.

First-quarter 2008 results reflect higher realized commodity prices in the partnership's natural gas gathering and processing segment and wider regional NGL product price spreads in the natural gas liquids gathering and fractionation segment, as well as volume growth due to new supply connections. The natural gas liquids pipelines segment also benefited from the results of operations of the North System, an interstate natural gas liquids and refined petroleum products pipeline system that was acquired in October 2007.

    FIRST-QUARTER 2008 SUMMARY INCLUDES:

    -- Operating income of $150.5 million, compared with $104.4 million in the
       first quarter last year;
    -- Natural gas gathering and processing segment operating income of $59.1
       million, compared with $30.5 million in the first quarter 2007;
    -- Natural gas pipelines segment operating income of $31.7 million,
       compared with $32.4 million in the first quarter 2007;
    -- Natural gas liquids gathering and fractionation segment operating
       income of $45.3 million, compared with $32.0 million in the first
       quarter 2007;
    -- Natural gas liquids pipelines segment operating income of $13.8
       million, compared with $8.6 million in the first quarter 2007;
    -- Equity earnings from investments of $27.8 million, compared with $24.1
       million in the first quarter 2007;
    -- Capital expenditures increasing to $267.1 million, compared with $74.6
       million in the first quarter 2007, primarily due to internally
       generated growth activities;
    -- Completing a public offering of 2.5 million common units and a private
       placement with ONEOK, Inc. of 5.4 million common units, generating
       total proceeds of approximately $443.6 million;
    -- Announcing with Northern Border Pipeline, of which ONEOK Partners owns
       50 percent, a binding open season on the proposed Bison Pipeline, a
       project that will connect natural gas gathering facilities located in
       Wyoming's Powder River Basin to Northern Border Pipeline;
    -- Announcing a $25 million natural gas liquids gathering pipeline to
       connect two natural gas processing plants in the Woodford Shale play in
       southeast Oklahoma to the partnership's Mid-Continent gathering and
       fractionation assets;
    -- Increasing the quarterly distribution to $1.04 per unit, marking the
       ninth consecutive quarter to raise the distribution; and
    -- Appointing Caron A. Lawhorn as chief accounting officer for ONEOK
       Partners.


    FIRST-QUARTER 2008 BUSINESS UNIT RESULTS

Natural Gas Gathering and Processing Segment

The natural gas gathering and processing segment reported EBITDA of $77.0 million in the first quarter 2008, compared with $47.4 million in the same period a year earlier. Operating income for first quarter 2008 was $59.1 million, compared with $30.5 million for first quarter 2007.

First-quarter 2008 operating income increased $24.5 million from higher realized commodity prices, primarily on percent-of-proceeds contracts; $3.1 million from higher volumes processed; and $2.1 million due to improved contract terms. Operating costs for the segment were $33.1 million, relatively unchanged from the same period in 2007.

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,
                                                2008              2007
    Percent of proceeds
      Wellhead purchases (MMBtu/d)             70,594            90,636
      NGL sales (Bbl/d)                         5,723             6,095
      Residue sales (MMBtu/d)                  36,607            30,294
      Condensate sales (Bbl/d)                  1,127             1,122
      Percentage of total net margin               58%               61%
    Fee-based
      Wellhead volumes (MMBtu/d)            1,191,801         1,167,714
      Average rate ($/MMBtu)                    $0.26             $0.24
      Percentage of total net margin               24%               33%
    Keep-whole
      NGL shrink (MMBtu/d)                     23,515            22,018
      Plant fuel (MMBtu/d)                      2,488             2,689
      Condensate shrink (MMBtu/d)               2,011             2,215
      Condensate sales (Bbl/d)                    407               448
      Percentage of total net margin               18%                6%


The natural gas gathering and processing segment is exposed to commodity price risk, primarily NGLs, as a result of receiving commodities in exchange for services. The following table sets forth the natural gas gathering and processing segment's hedging information for the remainder of 2008:

                                       Volumes                     Percentage
                                       Hedged     Average Price      Hedged
    Natural gas liquids (Bbl/d) (a)    8,421     $1.31 ($/gallon)      72%
    Condensate (Bbl/d) (a)               799     $2.15 ($/gallon)      73%
    Total liquid sales (Bbl/d)         9,220     $1.39 ($/gallon)      72%

    Natural gas (MMBtu/d) (a)          5,665     $9.23 ($/MMBtu)       78%
    (a) - Hedged with fixed-priced swaps.


The partnership currently estimates that a 1 cent per gallon increase in the composite price of natural gas liquids would increase annual net margin by approximately $1.6 million. A $1.00 per barrel increase in the price of crude oil would increase annual net margin by approximately $0.7 million. Also, a 10 cent per MMBtu increase in the price of natural gas would increase annual net margin by approximately $0.3 million. All these sensitivities exclude the effects of hedging and assume normal operating conditions.

Natural Gas Pipelines Segment

The natural gas pipelines segment reported first-quarter 2008 EBITDA of $59.6 million, compared with $58.8 million for the same period in 2007. Operating income for the first quarter 2008 was $31.7 million, compared with $32.4 million for the first quarter 2007.

During the quarter, operating income benefited primarily from $2.2 million in improved natural gas storage margins resulting from new and renegotiated contracts, offset by $2.5 million in higher operating costs in the first quarter 2008, compared with first quarter 2007, primarily due to increased general operating expenses, including general taxes and employee-related costs.

Equity earnings from investments were $20.1 million, compared with $18.2 million in the first quarter 2007. The $1.9 million increase is primarily due to higher throughput on Northern Border Pipeline, in which the partnership has a 50 percent interest.

Natural Gas Liquids Gathering & Fractionation Segment

The natural gas liquids gathering and fractionation segment reported EBITDA of $50.2 million in the first quarter 2008, compared with $37.2 million for the same period last year. Operating income for first quarter 2008 was $45.3 million, compared with $32.0 million for the first quarter 2007.

Operating income increased $10.6 million from wider regional NGL product price spreads between the NGL market centers in Conway, Kan., and Mont Belvieu, Texas; $5.6 million from increased volumes due to new supply connections and increased fractionation volumes; and $1.2 million from higher storage margins. Operating costs increased $3.9 million in the first quarter 2008, compared with first quarter 2007, primarily due to costs incurred to comply with regulations at the partnership's storage facilities and higher employee-related costs.

The Conway-to-Mont Belvieu Oil Price Information Service (OPIS) average spread for the first quarter 2008 for ethane/propane mix was 9 cents per gallon, compared with 6 cents per gallon in the same period last year.

Natural Gas Liquids Pipelines Segment

The natural gas liquids pipelines segment reported EBITDA of $18.2 million in the first quarter 2008, compared with $12.1 million in the same period last year. Operating income was $13.8 million, compared with $8.6 million for the first quarter 2007.

First-quarter 2008 operating income increased $5.2 million, benefiting from $14.3 million of increased margins primarily from incremental earnings from the recently acquired North System, as well as increased volumes. Volumes increased due to new NGL supply connections and increased production from existing supply connections. Operating costs for the segment increased $8.0 million in the first quarter 2008, compared with the first quarter 2007, primarily due to incremental expenses associated with operating the North System that was acquired in October 2007, as well as higher employee-related costs.

GROWTH ACTIVITIES

In first quarter 2008, the partnership continued executing approximately $1.6 billion of internally generated growth projects that are expected to be completed in 2008 and 2009.

Natural Gas Liquids Projects

In February 2008, the partnership announced a $25 million, 78-mile NGL pipeline extension of its Oklahoma gathering system into the Woodford Shale in southeast Oklahoma that is currently scheduled for completion in the second quarter of 2008. The pipeline will connect two natural gas processing plants that have the ability to produce approximately 25,000 barrels per day of natural gas liquids.

The natural gas liquids projects, which account for approximately $1.2 billion of the current growth projects, also include a joint venture to build Overland Pass Pipeline, a $535 million, 760-mile natural gas liquids pipeline extending from Opal, Wyo., to Conway, Kan. Overland Pass is designed to transport approximately 110,000 barrels per day of NGLs, and capacity can be increased to more than 220,000 barrels per day with additional pump facilities. Construction on the pipeline began in the fall of 2007 and it is currently expected to begin operating during the third quarter of 2008. The severe winter weather conditions in southern Wyoming and construction interruptions due to restrictions in state and federally regulated wildlife areas could further impact estimated costs and the construction schedule.

Other natural gas liquids projects include a $216 million expansion of existing NGL fractionation capabilities and the capacity of NGL distribution pipelines in the Mid-Continent region currently expected to be complete in the second quarter of 2008; a $120 million, 150-mile lateral pipeline connecting the Piceance Basin with Overland Pass Pipeline that is currently expected to be in service during the second quarter of 2009; and the $260 million, 440- mile Arbuckle Pipeline extending from southern Oklahoma through the Barnett Shale of North Texas and on to the partnership's fractionation and storage facilities at Mont Belvieu on the Texas Gulf Coast, which is currently expected to go into service in early 2009. The Arbuckle Pipeline will have initial capacity to transport approximately 160,000 barrels per day of NGLs, and can be expanded to more than 210,000 barrels per day with additional pump facilities.

Natural Gas Projects

In April 2008, Northern Border Pipeline announced a binding open season on the Bison Pipeline project. The proposed pipeline would extend from natural gas gathering facilities in the Powder River Basin supply area to a point of interconnection with Northern Border Pipeline in Morton County, N.D. The 289-mile Bison Pipeline would have initial capacity of approximately 400 million cubic feet per day with a maximum capacity of 660 million cubic feet per day and is projected to be in service in November 2010. ONEOK Partners owns 50 percent of Northern Border Pipeline.

The $277 million, 119-mile Guardian expansion and extension project is currently targeted to be in service in the fourth quarter of 2008.

The $30 million expansion of the partnership's Grasslands natural gas processing facility in the highly active Williston Basin will increase the plant's processing capacity by nearly 60 percent and its fractionation capacity by 50 percent. The expansion project is becoming operational in phases, with the final phase currently expected to come on line in the second half of 2008.

Additionally, the Fort Union Gas Gathering expansion project is currently expected to be fully operational in the second quarter of 2008. The project will double the gathering pipeline capacity of Fort Union Gas Gathering by adding approximately 150 miles of new gathering lines and approximately 650 million cubic feet per day of additional capacity. ONEOK Partners owns approximately 37 percent of Fort Union Gas Gathering, L.L.C.

CONFERENCE CALL AND WEBCAST

ONEOK Partners and ONEOK management will conduct a joint conference call on Thursday, May 1, 2008, 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 866-847-7864, pass code 1226646, or log on to www.oneokpartners.com or 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, www.oneokpartners.com, and ONEOK's Web site, 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 1226646.

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 Agreement. Management further uses EBITDA to compare the financial performance of its segments and to internally manage those business segments. Reconciliations of EBITDA to net 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. Our general partner is a wholly owned subsidiary of ONEOK, Inc. (NYSE: OKE), a diversified energy company, which owns 47.7 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 www.oneokpartners.com or www.oneok.com.

Some of the statements contained and incorporated in this news release are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities and Exchange Act of 1934, as amended. 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. 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 news release identified by words such as "anticipate," "estimate," "expect," "project," "intend," "plan," "believe," "should," "goal," "forecast," "could," "may," "continue," "might," "potential," "scheduled" and other words and terms of similar meaning.

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 capital intensive nature of our businesses;
    -- the profitability of assets or businesses acquired by us;
    -- 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, authorized rates or recovery of gas and gas transportation
       costs;
    -- 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;
    -- changes in demand for the use of natural gas because of market
       conditions caused by concerns about global warming or changes in
       governmental policies and regulations due to climate change
       initiatives;
    -- 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 expense and
       funding resulting from changes in stock and bond market returns;
    -- actions by rating agencies concerning the credit ratings of us or our
       general partner;
    -- the results of administrative proceedings and litigation, regulatory
       actions and receipt of expected clearances involving the OCC, KCC,
       Texas regulatory authorities or any other local, state or federal
       regulatory body, including the FERC;
    -- 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
       which outpace new drilling;
    -- 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;
    -- the ability to market pipeline capacity on favorable terms, including
       the affects 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;
       - availability of additional storage capacity;
       - weather conditions; and
       - competitive developments by Canadian and U.S. natural gas
         transmission peers;
    -- 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 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;
    -- the mechanical integrity of facilities operated;
    -- demand for our services in the proximity of our facilities;
    -- our ability to control operating costs;
    -- 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 significant slowdown in growth or decline in the U.S.
       economy or the risk of delay in growth recovery in the U.S. economy;
    -- the impact of recently issued and future accounting pronouncements 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 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;
    -- our ability to promptly obtain all necessary materials and supplies
       required for construction of gathering, processing, storage,
       fractionation and transportation facilities;
    -- 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 Part I, Item 1A, Risk Factors, in our Annual Report on Form 10-K for the year ended December 31, 2007. 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. OKS-FE

     Analyst Contact: Christy Williamson
                      918-588-7163
     Media Contact:   Tom Droege
                      918-588-7561


    ONEOK Partners, L.P. and Subsidiaries
    CONSOLIDATED STATEMENTS OF INCOME
                                                    Three Months Ended
                                                         March 31,
    (Unaudited)                                    2008            2007
                                                  (Thousands of dollars,
                                                 except per unit amounts)

    Revenues
    Operating revenue                           $2,059,035      $1,168,674
    Cost of sales and fuel                       1,790,510         963,304
    Net Margin                                     268,525         205,370
    Operating Expenses
     Operations and maintenance                     76,941          66,676
     Depreciation and amortization                  29,942          27,513
     General taxes                                  11,141           9,008
    Total Operating Expenses                       118,024         103,197
    Gain on Sale of Assets                              31           2,203
    Operating Income                               150,532         104,376
    Equity earnings from investments                27,783          24,055
    Allowance for equity funds used
     during construction                             8,496           1,337
    Other income                                     2,058           1,463
    Other expense                                   (2,131)           (213)
    Interest expense                               (38,529)        (32,300)
    Income before Minority Interests and
     Income Taxes                                  148,209          98,718
    Minority interests in income of
     consolidated subsidiaries                        (123)            (85)
    Income taxes                                    (3,068)         (2,877)
    Net Income                                    $145,018         $95,756

    Limited partners' interest in net income:
    Net income                                    $145,018         $95,756
    General partners' interest in net
     income                                        (19,705)        (13,278)
     Limited Partners' Interest in Net
      Income                                      $125,313         $82,478

    Limited partners' per unit net income:
     Net income per unit                             $1.48           $1.00
    Number of Units Used in Computation
     (Thousands)                                    84,454          82,891

    Supplemental Information (1):
    EBITDA                                        $208,184        $157,194
    Distributable cash flow                       $158,881        $117,067
    Distributable cash flow per unit                 $1.66           $1.25

    (1) Reconciliations of non-GAAP financial measures are included in the
        financial tables attached to this release.


    ONEOK Partners, L.P. and Subsidiaries
    CONSOLIDATED BALANCE SHEETS
                                                 March 31,        December 31,
    (Unaudited)                                    2008              2007
    Assets                                          (Thousands of dollars)

    Current Assets
     Cash and cash equivalents                   $232,805           $3,213
     Accounts receivable, net                     491,467          577,989
     Affiliate receivables                         63,756           52,479
     Gas and natural gas liquids in
      storage                                     183,682          251,219
     Commodity exchanges and imbalances            72,456           82,037
     Other current assets                          20,096           19,961
      Total Current Assets                      1,064,262          986,898

    Property, Plant and Equipment
     Property, plant and equipment              4,768,804        4,436,371
     Accumulated depreciation and
      amortization                                803,691          776,185
      Net Property, Plant and Equipment         3,965,113        3,660,186

    Investments and Other Assets
     Investment in unconsolidated
      affiliates                                  754,304          756,260
     Goodwill and intangible assets               680,168          682,084
     Other assets                                  32,108           26,637
      Total Investments and Other Assets        1,466,580        1,464,981
      Total Assets                             $6,495,955       $6,112,065

    Liabilities and Partners' Equity

    Current Liabilities
     Current maturities of long-term debt         $11,931          $11,930
     Notes payable                                      -          100,000
     Accounts payable                             736,596          742,903
     Affiliate payables                            30,153           18,298
     Commodity exchanges and imbalances           215,476          252,095
     Accrued interest                              72,752           38,435
     Other current liabilities                     82,002           98,229
      Total Current Liabilities                 1,148,910        1,261,890

    Long-term Debt, excluding current
     maturities                                 2,601,425        2,605,396

    Deferred Credits and Other
     Liabilities                                   46,025           43,799

    Commitments and Contingencies

    Minority Interests in Consolidated
     Subsidiaries                                   5,851            5,802

    Partners' Equity
     General partner                               71,304           58,415
     Common units: 54,297,214 units and
      46,397,214 units issued and
      outstanding at March 31, 2008,
      and December 31, 2007, respectively       1,281,044          814,266
     Class B units: 36,494,126 units
      issued and outstanding at
      March 31, 2008, and December 31, 2007     1,357,788        1,340,638
     Accumulated other comprehensive
      income (loss)                               (16,392)         (18,141)
      Total Partners' Equity                    2,693,744        2,195,178
      Total Liabilities and Partners'
       Equity                                  $6,495,955       $6,112,065



    ONEOK Partners, L.P. and Subsidiaries
    CONSOLIDATED STATEMENTS OF CASH FLOWS
                                                    Three Months Ended
                                                         March 31,
    (Unaudited)                                    2008             2007
                                                   (Thousands of dollars)
    Operating Activities
    Net income                                   $145,018         $95,756
    Depreciation and amortization                  29,942          27,513
    Allowance for equity funds used
     during construction                           (8,496)         (1,337)
    Gain on sale of assets                            (31)         (2,203)
    Minority interests in income of
     consolidated subsidiaries                        123              85
    Equity earnings from investments              (27,783)        (24,055)
    Distributions received from
     unconsolidated affiliates                     24,040          26,455
    Changes in assets and liabilities
     (net of acquisition and disposition
     effects):
     Accounts receivable                           81,852         (13,697)
     Affiliate receivables                        (11,277)         25,745
     Gas and natural gas liquids in
      storage                                      43,696          15,592
     Accounts payable                             (34,232)         85,139
     Affiliate payables                            11,855         (18,369)
     Commodity exchanges and imbalances,
      net                                         (27,038)         (7,104)
     Accrued interest                              34,317          25,950
     Other assets and liabilities                 (19,913)          7,151
     Cash Provided by Operating Activities        242,073         242,621

    Investing Activities
    Changes in investments in
     unconsolidated affiliates                      3,311            (141)
    Capital expenditures (less allowance
     for equity funds used during
     construction)                               (267,058)        (74,564)
    Proceeds from sale of assets                       72           3,707
    Other                                           2,450               -
     Cash Used in Investing Activities           (261,225)        (70,998)

    Financing Activities
    Cash distributions to:
     General and limited partners                (101,135)        (93,675)
     Minority interests                               (74)              -
    Borrowing (repayment) of notes
     payable, net                                (100,000)         (6,000)
    Issuance of common units, net of
     discounts                                    443,579               -
    Contributions from general partner              9,355               -
    Payment of long-term debt                      (2,981)              -
    Other                                               -             (30)
     Cash Provided by (Used in) Financing
      Activities                                  248,744         (99,705)
      Change in Cash and Cash Equivalents         229,592          71,918
      Cash and Cash Equivalents at
       Beginning of Period                          3,213          21,102
      Cash and Cash Equivalents at End of
       Period                                    $232,805         $93,020



    ONEOK Partners, L.P. and Subsidiaries
    INFORMATION AT A GLANCE
                                                    Three Months Ended
                                                         March 31,
    (Unaudited)                                     2008           2007
                                                   (Millions of dollars)
    Natural Gas Gathering and Processing
    Net margin                                     $103.9         $73.4
    Operating costs                                 $33.1         $34.0
    Depreciation and amortization                   $11.8         $11.1
    Operating income                                $59.1         $30.5
    Equity earnings from investments                 $7.0          $5.6
    Total natural gas gathered (BBtu/d)             1,192         1,168
    Total natural gas processed (BBtu/d)              624           609
    Natural gas liquids sales (MBbl/d)                 38            37
    Natural gas sales (BBtu/d)                        277           268
    Realized composite NGL sales price
     ($/gallon)                                     $1.33         $0.82
    Realized condensate sales price
     ($/Bbl)                                       $87.51        $56.53
    Realized natural gas sales price
     ($/MMBtu)                                      $7.40         $6.58
    Realized gross processing spread
     ($/MMBtu)                                      $7.43         $3.59
    Capital expenditures - growth                   $23.4         $13.8
    Capital expenditures - maintenance               $3.1          $2.5

    Natural Gas Pipelines
    Net margin                                      $63.7         $61.5
    Operating costs                                 $23.6         $21.1
    Depreciation and amortization                    $8.4          $8.0
    Operating income                                $31.7         $32.4
    Equity earnings from investments                $20.1         $18.2
    Natural gas transported (MMcf/d)                3,956         3,948
    Average natural gas price
     Mid-Continent region ($/MMBtu)                 $7.18         $6.29
    Capital expenditures - growth                   $20.9         $16.4
    Capital expenditures - maintenance               $1.3          $1.2

    Natural Gas Liquids Gathering and
     Fractionation
    Net margin                                      $69.5         $52.1
    Operating costs                                 $18.6         $14.7
    Depreciation and amortization                    $5.6          $5.3
    Operating income                                $45.3         $32.0
    Natural gas liquids gathered (MBbl/d)             251           210
    Natural gas liquids sales (MBbl/d)                286           220
    Natural gas liquids fractionated
     (MBbl/d)                                         391           319
    Conway-to-Mont Belvieu OPIS average spread
     Ethane/Propane mixture ($/gallon)              $0.09         $0.06
    Capital expenditures - growth                   $26.7          $5.0
    Capital expenditures - maintenance               $2.9          $2.4

    Natural Gas Liquids Pipelines
    Net margin                                      $31.4         $17.0
    Operating costs                                 $13.4          $5.4
    Depreciation and amortization                    $4.1          $3.0
    Operating income                                $13.8          $8.6
    Equity earnings from investments                 $0.7          $0.3
    Natural gas liquids transported
     (MBbl/d)                                         303           205
    Natural gas liquids gathered (MBbl/d)              92            71
    Capital expenditures - growth                  $188.1         $32.7
    Capital expenditures - maintenance               $0.6          $0.4


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

                                                    Three Months Ended
                                                         March 31,
    (Unaudited)                                    2008            2007
                                                  (Thousands of dollars)
    Reconciliation of Net Income to EBITDA
    Net income                                  $145,018          $95,756
    Minority interests                               123               85
    Interest expense, net                         38,529           32,300
    Depreciation and amortization                 29,942           27,513
    Income taxes                                   3,068            2,877
    Allowance for equity funds used
     during construction                          (8,496)          (1,337)
     EBITDA                                     $208,184         $157,194

    Natural Gas Gathering and Processing
     Reconciliation of Operating Income
     to EBITDA
    Operating income                             $59,053          $30,452
    Depreciation and amortization                 11,757           11,122
    Equity earnings from investments               7,044            5,608
    Other income (expense)                          (832)             243
     EBITDA                                      $77,022          $47,425

    Natural Gas Pipelines Reconciliation
     of Operating Income to EBITDA
    Operating income                             $31,714          $32,361
    Depreciation and amortization                  8,418            8,020
    Equity earnings from investments              20,061           18,168
    Other income (expense)                          (560)             247
     EBITDA                                      $59,633          $58,796

    Natural Gas Liquids Gathering and
     Fractionation Reconciliation of
     Operating Income to EBITDA
    Operating income                             $45,287          $31,999
    Depreciation and amortization                  5,619            5,332
    Equity earnings from investments                   -                -
    Other income (expense)                          (730)            (109)
     EBITDA                                      $50,176          $37,222

    Natural Gas Liquids Pipelines
     Reconciliation of Operating Income
     to EBITDA
    Operating income                             $13,813           $8,635
    Depreciation and amortization                  4,142            3,012
    Equity earnings from investments                 678              279
    Other income (expense)                          (424)             168
    EBITDA                                       $18,209          $12,094


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

                                                    Three Months Ended
                                                         March 31,
    (Unaudited)                                     2008            2007
                                                   (Thousands of dollars,
                                                   except per unit amounts)
    Reconciliation of EBITDA to
     Distributable Cash Flow
    EBITDA                                        $208,184        $157,194
    Gain on sale of assets                             (31)         (2,203)
    Interest expense, net                          (38,529)        (32,300)
    Maintenance capital                             (7,926)         (6,550)
    Distributions to minority interests                (74)              -
    Equity earnings from investments               (27,783)        (24,055)
    Distributions received from
     unconsolidated affiliates                      27,413          26,455
    Current income tax expense and other            (2,373)         (1,474)
     Distributable Cash Flow                      $158,881        $117,067


    Distributions to General Partner               (19,075)        (13,271)
    Distributable Cash Flow to Limited
     Partners                                     $139,806        $103,796

    Distributable Cash Flow per Limited
     Partner Unit                                    $1.66           $1.25

    Number of Units Used in Computation
     (Thousands)                                    84,454          82,891


SOURCE ONEOK Partners, L.P.

http://www.oneokpartners.com

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