ONEOK Partners Reports Higher Second-Quarter 2006 Results; Confirms 2006 Guidance

August 02, 2006

TULSA, Okla., Aug 02, 2006 /PRNewswire-FirstCall via COMTEX News Network/ -- ONEOK Partners, L.P. (NYSE: OKS) today reported second-quarter 2006 net income of $196.2 million, or $2.22 per unit, compared with net income of $28.1 million, or $0.55 per unit, for second quarter 2005. Year-to-date 2006, ONEOK Partners reported net income of $266.7 million, or $3.33 per unit, compared with $62.8 million, or $1.24 per unit, for the same period in 2005.

The partnership also confirmed its net income per unit guidance in the range of $4.43 to $4.69 per unit, which was announced on Feb. 15, 2006.

Cash flow, as measured by earnings before interest, taxes, depreciation and amortization (EBITDA), was $267.9 million for second quarter 2006, compared with $80.5 million in the second quarter of 2005. Distributable cash flow (DCF) for second quarter 2006 was $119.7 million, or $1.32 per unit, compared with $33.5 million, or $0.66 per unit, in second quarter 2005.

Second-quarter 2006 results reflect the April 2006 acquisition of assets comprising ONEOK, Inc.'s (NYSE: OKE) former gathering and processing, natural gas liquids, and pipelines and storage segments. The most recent results also reflect a $113.9 million, or $1.35 per unit, gain on the sale of a 20 percent partnership interest in Northern Border Pipeline Company in April 2006. Second-quarter results also include a non-cash, after-tax charge of approximately $10.5 million, or $0.13 per unit, to reflect asset and goodwill impairment charges for Black Mesa Pipeline, Inc.

"As expected, our results for the second quarter reflect the significant benefits from the purchase of the ONEOK assets," said David Kyle, chairman and chief executive officer of ONEOK Partners. "We also benefited from very strong gross processing spreads and a gain on the sale of a 20 percent interest in Northern Border Pipeline."

"In addition, our businesses are well positioned for future growth in distributable cash flow, as we have recently announced more than $1 billion in internally generated growth projects," Kyle added.

    SECOND-QUARTER 2006 HIGHLIGHTS INCLUDE:
     * The April 2006 acquisition of assets comprising ONEOK's former
       gathering and processing, natural gas liquids, and pipeline and storage
       assets for $3 billion, which resulted in the inclusion of these
       businesses in the consolidated financial statements as of Jan. 1, 2006;
     * ONEOK becoming the sole general partner and increasing its overall
       ownership in the partnership to 45.7 percent;
     * Increasing the second-quarter distribution to $0.95 per unit, achieving
       the high end of the partnership's previously announced quarterly
       distribution target range;
     * The consolidation of Guardian Pipeline, L.L.C. as a result of the April
       2006 acquisition of the remaining 66-2/3 percent interest in Guardian
       Pipeline for $77 million;
     * Forming a joint-venture company, Overland Pass Pipeline Company LLC, to
       build a 750-mile natural gas liquids pipeline to link the high-growth
       NGL production area in the Rocky Mountain region to the partnership's
       fractionation facilities at Bushton and Conway, Kansas;
     * The deconsolidation of results for Northern Border Pipeline Company
       effective Jan. 1, 2006, due to the sale of a 20 percent interest in the
       pipeline in April 2006, to TC PipeLines, LP for approximately $297
       million, and the resulting $113.9 million gain on sale;
     * The April 2006 start-up of Northern Border Pipeline's Chicago III
       Expansion Project as planned, adding 130 million cubic feet per day
       (mmcfd) of transportation capacity to the Chicago area;
     * The May 22, 2006, name and ticker symbol change to ONEOK Partners, L.P.
       (NYSE: OKS) from Northern Border Partners, L.P. (NYSE: NBP);
     * Higher realized gross processing spreads for the partnership's
       gathering and processing business;
     * Higher interest expense, due to higher average debt outstanding
       associated with the acquisitions, partially offset by the Northern
       Border Pipeline deconsolidation;
     * An after-tax, non-cash charge of approximately $10.5 million to reflect
       asset and goodwill impairments for Black Mesa Pipeline, Inc.  The
       impairment charges had no impact on second-quarter 2006 cash flows from
       operating activities or second-quarter 2006 EBITDA.  The impairment is
       being taken as a result of a June 2006 announcement by Southern
       California Edison, co-owner of the Mohave Generating Station, that it
       would no longer pursue resuming operations of the generating station,
       which is the sole customer of Black Mesa Pipeline.
Gathering and Processing Segment

The natural gas gathering and processing segment reported EBITDA of $64.4 million and $127.5 million in the three- and six-month periods ended June 30, 2006, respectively, compared with $19.1 million and $36.8 million in the three- and six-month periods ended June 30, 2005, respectively. The gathering and processing assets acquired from ONEOK, located primarily in the Mid- Continent region of the U.S., accounted for most of the additional EBITDA.

Reported net margins increased $67.8 million and $134.5 million for the three and six months ended June 30, 2006, respectively, compared with the same periods last year. The margin increases were the result of the acquisition of the ONEOK gathering and processing assets, which accounted for $63.8 million and $126.2 million of net margins for the three and six months ended June 30, 2006, respectively; increased natural gas volumes gathered in the Rocky Mountain region; and increased natural gas liquids revenue due to higher prices and higher volumes in the Rocky Mountain region.

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.
                                                          Six Months Ended
                                                              June 30,
                                                      2006            2005 (A)
    Keep-whole
      NGL shrink (MMBtu/d)                           36,974               ---
      Plant fuel (MMBtu/d)                            4,861               ---
      Condensate shrink (MMBtu/d)                     3,234               ---
      Condensate sales (Bbl/d)                          664               ---
      Percentage of total net margin                     14%                0%
    Percent-of-proceeds
      Wellhead purchases (MMBtu/d)                  125,907               ---
      NGL sales (Bbl/d)                               7,131             2,199
      Residue sales (MMBtu/d)                        28,905            11,906
      Condensate sales (Bbl/d)                        1,115               ---
      Percentage of total net margin                     61%               58%
    Fee-based
      Wellhead volumes (MMBtu/d)                  1,149,272           289,214
      Average rate ($/MMBtu)                          $0.22             $0.41
      Percentage of total net margin                     25%               42%

     (A) Excludes results related to the acquisition of the ONEOK gathering
         and processing assets.


The partnership estimates that a $0.10 per MMBtu increase in the price of natural gas would decrease annual net income by approximately $0.5 million. Also, a $0.01 per gallon decrease in the price of natural gas liquids would decrease annual net income by approximately $2.5 million. A $1.00 per barrel decrease in the price of crude oil would decrease annual net income by approximately $0.5 million. All these sensitivities exclude the effects of hedging.

As shown in the table below, for the remainder of 2006, the gathering and processing segment is approximately 40 percent hedged on its percent-of- proceeds natural gas projected volumes; approximately 35 percent hedged on its percent-of-proceeds projected natural gas liquids volumes; and approximately 31 percent hedged on its projected keep-whole gross processing spread.
                                                        Year Ending
                                                      December 31, 2006
                                                   Volumes        Average
    Product                                         Hedged     Price Per Unit
    Percent-of-proceeds
      Condensate (A) (Bbl/d)                           815     $52.00-60.00
      Natural gas liquids (B) (Bbl/d)                2,813        $44.13
      Natural gas (A) (MMBtu/d)                      5,217      $6.15-11.00
      Natural gas (B) (MMBtu/d)                      7,000         $7.92
    Keep-whole
      Gross processing spread (MMBtu/d)             10,550         $6.01

     (A)  Hedged with NYMEX-based collars.
     (B)  Hedged with fixed-price swaps.


Operating costs for the segment increased $25.8 million and $48.9 million for the three and six months ended June 30, 2006, respectively, as did depreciation and amortization expense, which increased $6.5 million and $13.1 million, respectively for the same periods. The increases in operating costs and depreciation and amortization were primarily due to the acquisition of the assets from ONEOK and gathering system expansions.

Equity earnings from investments increased $1.0 million and $2.4 million for the three and six months ended June 30, 2006, respectively, compared with the same periods last year due to increased volumes gathered at Bighorn Gas Gathering and Fort Union Gas Gathering, partially offset by lower volumes gathered at the Wind River Basin joint venture, Lost Creek.

The following information for the gathering and processing assets acquired from ONEOK compares 2006 results with periods prior to the acquisition. As a result, it is not reported in the financial tables of this press release, but is provided here solely for purposes of comparing performance for the three- and six-month periods ended June 30, 2006, with the comparable periods in 2005.
     * Net margins for the assets acquired from ONEOK increased $8.7 million
       and $18.8 million for the second quarter and six months ended June 30,
       2006, respectively, primarily due to favorable commodity pricing for
       natural gas liquids and natural gas on percent-of-proceeds contracts
       and higher gross processing spreads on keep-whole contracts.  Margins
       were partially offset by lower gathering and processing volumes related
       to natural reserve declines for production connected to the
       partnership's systems, and contract terminations;

     * The realized gross processing spread for the second quarter of 2006 was
       $6.11 per million British Thermal Units (MMBtu), significantly higher
       than the previous five-year average of $1.86 per MMBtu.  Based on
       current market conditions, the gross processing spread for the
       remainder of 2006 is expected to continue to be significantly higher
       than the previous five-year average;

     * Operating costs for the acquired assets increased $1.2 million and $2.3
       million for the three and six months ended June 30, 2006, respectively,
       compared with the same periods last year, primarily due to higher
       employee costs and utility costs.
Natural Gas Liquids Segment

The natural gas liquids segment reported EBITDA of $35.1 million and $57.5 million in the three- and six-month periods ended June 30, 2006, respectively. Net margins were $50.5 million in the second quarter 2006 and $84.3 million in the first half of 2006. The EBITDA and net margin increases for the second quarter and six months 2006 are entirely incremental to the partnership due to the acquisition of ONEOK's former natural gas liquids segment in April 2006.

Operating costs were $15.9 million and $27.2 million in the second-quarter and six-month periods, respectively. Depreciation and amortization was $5.4 million and $10.8 million in the second-quarter and six-month periods, respectively.

The following information for the natural gas liquids segment acquired by the partnership from ONEOK compares 2006 results with periods prior to the partnership's acquisition. As a result, it is not reported in the financial tables of this press release, but is provided here solely for purposes of comparing performance for the three- and six-month periods ended June 30, 2006, with the comparable periods in 2005. Because ONEOK acquired the majority of these assets from Koch Industries in July 2005, the following comparisons are with ONEOK's legacy natural gas liquids assets only:
     * Net margins increased $43.4 million and $70.0 million for the three and
       six months ended June 30, 2006, respectively, compared with the three-
       and six-month periods ended June 30, 2005;

     * Operating costs increased $12.9 million and $21.8 million for the three
       and six months ended June 30, 2006;

     * Depreciation and amortization increased $5.3 million and $10.7 million
       for the three and six months ended June 30, 2006, respectively, over
       comparable periods in 2005.
Pipelines and Storage Segment

The pipelines and storage segment reported EBITDA of $32.5 million and $69.3 million for the three and six months ended June 30, 2006, respectively. Net margins were $50.6 million in the second quarter 2006 and $102.8 million in the first half of 2006, which are entirely incremental to the partnership due to the partnership's acquisition of ONEOK's pipeline and storage assets in April 2006.

The following information for the pipeline and storage segment acquired from ONEOK compares 2006 results with periods prior to the partnership's acquisition. As a result, it is not reported in the financial tables of this press release, but is provided solely for purposes of comparing performance for the three-and six-month periods ended June 30, 2006, with the comparable periods in 2005.
     * Net margins increased $19.4 million and $41.4 million for the three and
       six months ended June 30, 2006, respectively, compared with the same
       periods last year when ONEOK owned the assets. The net margin increases
       were primarily due to additional revenue generated from the natural gas
       liquids gathering and distribution pipelines ONEOK acquired from Koch
       in July 2005, increased natural gas transportation revenue from higher
       realized rates and higher volumes in the segment's commodity-based
       short-term business and an improved fuel position.  These increases
       were partially offset by lower natural gas storage revenue during the
       second quarter 2006 as a result of lower injection volumes;

     * Operating costs for the acquired pipelines and storage segment assets
       increased $6.0 million and $11.3 million for the three and six months
       ended June 30, 2006, respectively, compared with the same periods last
       year, primarily due to increased operating expense associated with
       ONEOK's acquisition of natural gas liquids gathering and distribution
       pipelines from Koch and higher employee-related expenses.
Interstate Natural Gas Pipeline Segment

The interstate natural gas pipeline segment contributed EBITDA of $141.4 million and $184.4 for the three and six months ended June 30, 2006, respectively, compared with $61.2 million and $134.1 million for the same periods in 2005. EBITDA for second quarter 2006 includes a $113.9 million gain on the sale of the 20 percent ownership interest in Northern Border Pipeline; equity earnings from Northern Border Pipeline of $12.7 million; and $6.2 million as a result of the April 2006 acquisition of the remaining 66-2/3 percent interest in Guardian Pipeline, which was consolidated beginning Jan. 1, 2006. EBITDA for the second quarter 2005 included $53.8 million from Northern Border Pipeline prior to its deconsolidation.

Net margins decreased $59.3 million and $130.4 million for the three and six months ended June 30, 2006, respectively, compared with the same periods last year, as a result of the deconsolidation of Northern Border Pipeline. Operating costs decreased $13.6 million and $29.3 million, respectively, for the three and six months ended June 30, 2006, as did depreciation and amortization, which decreased $13.0 million and $25.8 million, respectively, for the same periods. These decreases were also primarily a result of the deconsolidation of Northern Border Pipeline.

Equity earnings from investments for the three and six months ended June 30, 2006, were $12.7 million and $38.9 million, respectively, representing the partnership's 50 percent interest in Northern Border Pipeline that is no longer consolidated as of January 1, 2006, due to the sale of a 20 percent interest in the pipeline. Equity earnings from investments for the three and six months ended June 30, 2005, were $0.2 million and $0.6 million, respectively, representing the partnership's 33-1/3 percent interest in Guardian Pipeline that is now consolidated with the partnership's interstate natural gas pipelines segment, as a result of the April 2006 acquisition of the remaining interests in the pipeline.

Minority interest for the three and six months ended June 30, 2006, primarily represents the 66-2/3 percent interest in Guardian Pipeline that the partnership did not own until it acquired the remaining interests in April 2006. Minority interest for the three and six months ended June 30, 2005, represents the 30 percent interest in Northern Border Pipeline owned by TC PipeLines when Northern Border Pipeline's results were consolidated with the interstate natural gas pipelines segment.

GROWTH ACTIVITIES

Recently, the partnership announced that it will invest more than $1 billion in internally generated growth projects over the next three years. The projects include $433 million to build Overland Pass Pipeline and another $173 million to make related infrastructure upgrades in the partnership's existing natural gas liquids operations. Approximately $450 million of additional investment will be made in other projects, which include the previously announced Guardian II and Midwestern Gas Transmission projects.

Northern Border Pipeline's Chicago III expansion project was placed in service at the end of April 2006. The Chicago III expansion project increases Northern Border Pipeline's transportation capacity by 130 mmcfd, to 974 mmcfd, from Harper, Iowa, to the Chicago market area. Increased revenues from the expansion have already been incorporated into the partnership's financial guidance for 2006.

ONEOK Partners completed the purchase of the remaining 66-2/3 percent ownership interest in Guardian Pipeline in April 2006. The $77 million purchase gave the partnership 100 percent ownership of the pipeline that transports Chicago-area gas to Wisconsin markets. As a result, the previously announced Guardian expansion and extension project, estimated to cost $220 million to $240 million, will increase pipeline throughput and operating income. Construction of that project is targeted to begin in 2008 and be completed in November 2008.

The partnership is currently constructing the eastern extension project of Midwestern Gas Transmission. The project will add 31 miles of natural gas pipeline into Tennessee, with 120 mmcfd of transportation capacity. It is estimated that the project will cost approximately $28 million. The proposed in-service date of November 2006 will likely be delayed for several months due to the delay in obtaining the Federal Energy Regulatory Commission certificate.

On June 1, 2006, the partnership announced that it had completed a series of transactions with a subsidiary of The Williams Companies, Inc. to form a joint venture called Overland Pass Pipeline Company LLC. The joint-venture company will build a 750-mile natural gas liquids pipeline from Opal, Wyo., to the Mid-Continent natural gas liquids market center in Conway, Kan. The pipeline will be designed to transport 110,000 barrels per day of natural gas liquids. The installation of additional pump facilities would increase the capacity to 150,000 barrels per day. Construction of the pipeline is expected to begin in the summer of 2007, with start-up scheduled for early 2008.

On June 8, 2006, ONEOK Partners, Boardwalk Pipeline Partners, LP and Energy Transfer Partners, LP signed a letter of intent regarding the formation of a joint venture that would construct a new interstate natural gas pipeline originating in North Texas, crossing the states of Oklahoma, Arkansas and terminating in Dyer County, Tenn., at a new interconnect with Texas Gas Transmission, LLC. The proposed interstate pipeline would have initial capacity of up to 1.0 billion cubic feet per day.

DISTRIBUTION DECLARATION

On July 19, 2006, the partnership's board of directors declared an 8 percent increase in the partnership's quarterly cash distribution to $0.95 per unit for the second quarter of 2006. The indicated annual rate is $3.80 per unit. The distribution is payable August 14, 2006, to unit holders of record on July 31, 2006. This achieves the high end of the previously announced target annual distribution rate.

2006 GUIDANCE

As reflected in Attachment A, the partnership is confirming its net income per unit guidance for 2006. Net income per unit for 2006 is expected to be in the range of $4.43 to $4.69.

However, net income guidance has changed to reflect pre-acquisition income tax and interest expense for the businesses acquired from ONEOK, favorable commodity prices for the gathering and processing segment, the purchase of additional interests in Guardian, and the Black Mesa Pipeline impairment. EBITDA is changing due to favorable commodity prices for the gathering and processing segment and the purchase of additional interests in Guardian.

Prior to the partnership's April 2006 acquisition of the ONEOK assets, those businesses were included in the consolidated state and federal income tax returns of ONEOK. The partnership's 2006 net income reflects income tax expense of $22.2 million in the first quarter of 2006; however, the income tax liability was retained by ONEOK. These items were not included in the partnership's Feb. 15, 2006, guidance but have been reflected in the current net income guidance.

Income of the acquired businesses for the first quarter of 2006 also reflected interest expense of $21.3 million, which represented interest charged on long-term debt owed to ONEOK. This debt was retained by ONEOK as part of the partnership acquisition.

Updated guidance for net income reflects the first-quarter income tax and interest expense for the assets acquired. In calculating net income, the updated guidance reduces the income allocated to ONEOK related to partial-year ownership for these expenses.

The partnership is also updating its 2006 capital expenditure guidance, which is summarized in the following table:
    2006 Projected Capital Expenditures        Growth   Maintenance    Total
                                                  (Millions of dollars)

    Gathering and Processing                     $66         $17         $83
    Natural Gas Liquids                           20          17          37
    Pipelines and Storage                        111          14         125
    Interstate Natural Gas Pipelines              35          13          48
    Total projected capital expenditures        $232         $61        $293


As reflected on Attachment A, distributable cash flow is expected to be in the range of $326 million to $346 million, or $3.96 to $4.23 per unit.

CONFERENCE CALL

ONEOK Partners and ONEOK will host a joint conference call on Thursday, August 3, 2006 at 11:00 a.m. Eastern Time to review second-quarter 2006 results and to discuss the 2006 outlook. This call may be accessed via the partnership's Web site at http://www.oneokpartners.com . The webcast will be available on the partnership's Web site for 30 days. The call-in number for the live conference call is 866-836-4700, pass code 890065. An audio replay of the call will be available through August 10, 2006, by dialing 866-837-8032 and entering pass code 890065.

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 for the six months ended June 30, 2006, and 2005, are included in the financial tables attached to this release. Reconciliations of projected 2006 EBITDA to projected net income and computations of projected DCF are also included in Attachment A of this release.

ONEOK Partners, L.P. is a publicly traded partnership whose purpose is to own, operate and acquire a diversified portfolio of energy assets. The Partnership owns and manages natural gas gathering, processing, storage, interstate and intrastate natural gas pipeline assets and 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.

For more information about ONEOK Partners, L.P., visit: http://www.oneokpartners.com .

Some of the statements contained and incorporated in the news release are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The forward-looking statements relate to: anticipated financial performance; management's plans and objectives for future operations; business prospects; 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," "forecast," "intend," "believe," "projection" or "goal."

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 U.S. 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,
       natural gas liquids, 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
       natural gas, crude oil and natural gas liquids 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 projects and required
       regulatory clearances; our ability to acquire all necessary rights-of-
       way in a timely manner, and our ability to promptly obtain all
       necessary materials and supplies required for construction;
     * 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 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, including the effect on pension expense and
       funding resulting from changes in stock and bond market returns;
     * 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;
     * performance of contractual obligations by our customers;
     * the uncertainty of estimates, including accruals;
     * 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.

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     Six Months Ended
                                           June 30,              June 30,
    (Unaudited)                         2006      2005        2006      2005
                                              (Thousands of dollars,
                                             except per unit amounts)

    Operating revenue              $1,159,350  $149,417  $2,329,179  $309,796
    Cost of sales and fuel            944,150    35,466   1,909,038    67,931
    Net margin                        215,200   113,951     420,141   241,865
    Operating expenses:
      Operations and maintenance       69,063    30,042     140,889    63,214
      Depreciation and amortization    39,282    21,456      66,752    42,848
      Taxes other than income           8,136     8,989      14,913    18,801
      Total operating expenses        116,481    60,487     222,554   124,863
    Gain on sale of assets            113,877       ---     114,865       ---
    Operating income                  212,596    53,464     312,452   117,002
    Interest expense, net              30,787    21,372      67,221    42,538
    Other income (expense):
      Equity earnings from
       investments                     18,004     4,418      49,817     8,895
      Other income                      3,614     1,082       5,421     1,823
      Other expense                    (5,425)     (234)     (6,150)     (457)
      Total other income, net          16,193     5,266      49,088    10,261
    Minority interest in net
     income                               519     8,629       2,138    20,818
    Income from continuing
     operations before income
     taxes                            197,483    28,729     292,181    63,907
    Income taxes                        1,284       997      25,478     1,896
    Income from continuing
     operations                       196,199    27,732     266,703    62,011
    Discontinued operations, net
     of tax                               ---       358         ---       748
    Net income to partners           $196,199   $28,090    $266,703   $62,759

    Limited partners' interest in
     net income:
    Net income to partners           $196,199   $28,090    $266,703   $62,759
    General partners' interest in
     net income                        12,105     2,552      51,745     5,235
      Limited partners' interest
       in net income                 $184,094   $25,538    $214,958   $57,524

    Limited partners' per unit net
     income:
    Income from continuing
     operations                         $2.22     $0.54       $3.33     $1.22
    Discontinued operations, net
     of tax                               ---      0.01         ---      0.02
      Net income per unit               $2.22     $0.55       $3.33     $1.24
    Number of units used in
     computation                       82,891    46,397      64,644    46,397

    Supplemental Information:
    EBITDA (A)                       $267,901   $80,485    $427,994  $171,157
    Distributable cash flow (B)      $119,749   $33,520    $171,645   $77,635
    Distributable cash flow per
     unit                               $1.32     $0.66       $2.44     $1.55


     (A) EBITDA is computed from net income plus minority interest, interest
         expense (net), income taxes, and depreciation and amortization; less
         equity AFUDC.

     (B) 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
                                                    June 30,         Dec. 31,
    (Unaudited)                                      2006              2005
    Assets                                           (Thousands of dollars)
    Current assets:
      Cash and cash equivalents                    $24,869           $43,090
      Accounts receivable, net                     416,076            82,848
      Gas and natural gas liquids in
       storage and imbalances                      247,920               ---
      Commodity exchanges                          203,187               ---
      Materials and supplies                        16,284             7,273
      Derivative financial instruments               3,998               ---
      Prepaid expenses and other                     8,391             5,211
      Total current assets                         920,725           138,422
    Property, plant and equipment:
      Property, plant and equipment              3,299,795         3,000,720
      Accumulated depreciation and
       amortization                                621,568         1,082,210
      Property, plant and equipment, net         2,678,227         1,918,510
    Investments and other assets:
      Investment in unconsolidated
       affiliates                                  756,053           290,756
      Goodwill and intangibles                     665,648           152,782
      Other                                         19,838            27,296
    Total investments and other assets           1,441,539           470,834
        Total assets                            $5,040,491        $2,527,766

    Liabilities and Partners' Equity
    Current liabilities:
      Current maturities of long-term debt         $11,931            $2,194
      Notes payable                              1,364,000           231,000
      Derivative financial instruments               9,937             4,571
      Accounts payable                             390,713            46,673
      Commodity exchanges                          337,532               ---
      Accrued taxes other than income               14,779            33,081
      Accrued interest                              10,237            17,446
      Other                                         37,358             7,033
      Total current liabilities                  2,176,487           341,998
    Long-term debt, net of current
     maturities                                    626,359         1,121,777
    Minority interests in partners'
     equity                                          5,548           274,510
    Deferred credits and other
     liabilities:
      Deferred income taxes                         14,085            10,311
      Derivative financial instruments               6,874             2,362
      Other liabilities                             28,252            11,219
      Total deferred credits and other
       liabilities                                  49,211            23,892
    Commitments and contingencies
    Partners' equity:
      General partners                              51,904            17,341
      Common units: 46,397,214 units issued
       and outstanding at June 30, 2006,
       and December 31, 2005                       802,559           750,201
      Class B units:  36,494,126 units
       issued and outstanding at June 30,
       2006                                      1,331,659               ---
      Accumulated other comprehensive
       income (loss)                                (3,236)           (1,953)
      Total partners' equity                     2,182,886           765,589
        Total liabilities and partners'
         equity                                 $5,040,491        $2,527,766



     ONEOK Partners, L.P. and Subsidiaries
     CONSOLIDATED STATEMENTS OF CASH FLOWS               Six Months Ended
                                                              June 30,
    (Unaudited)                                        2006             2005
                                                      (Thousands of Dollars)
    Operating Activities
    Net income to partners                         $266,703          $62,759
    Depreciation and amortization                    66,752           43,023
    Minority interests in net income                  2,138           20,818
    Equity earnings from investments                (49,817)          (8,895)
    Distributions received from
     investments                                     69,819            2,653
    Gain on sale of assets                         (115,349)             ---
    Non-cash gains on derivative
     financial instruments                           (3,842)             (58)
    Changes in components of working
     capital (net of acquisition
     effects):
      Accounts receivable                            75,224            8,149
      Commodity exchange receivable                 (70,028)             ---
      Inventories, prepaid expenses and
       other                                        (16,250)            (214)
      Accounts payable and other current
       liabilities                                   12,363           (9,182)
      Commodity exchange payable                    103,043              ---
      Accrued taxes other than income                (6,872)          (4,850)
      Accrued interest                                4,315              236
    Other                                             4,365           (3,132)
      Cash provided by operating activities         342,564          111,307

    Investing Activities
    Investments in unconsolidated
     affiliates                                      (8,212)          (1,454)
    Acquisitions                                 (1,438,485)             ---
    Proceeds from sale of assets                    297,236              ---
    Capital expenditures for property,
     plant and equipment                            (53,575)         (23,161)
    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          (1,217,579)         (24,615)

    Financing Activities
    Cash distributions:
      General and limited partners                  (84,761)         (79,812)
      Minority interests                               (147)         (31,943)
    Cash flow retained by ONEOK                    (176,978)             ---
    Debt reacquisition costs                         (3,628)             ---
    Long-term debt financing costs                     (179)          (1,327)
    Retirement of long-term debt                    (35,013)          (2,653)
    Short-term note payable, net                  1,157,500            7,000
    Payments upon termination of
     derivatives                                        ---           (2,654)
      Cash provided by (used in) financing
       activities                                   856,794         (111,389)
        Change in cash and cash equivalents         (18,221)         (24,697)
        Cash and cash equivalents at
         beginning of period                         43,090           33,980
        Cash and cash equivalents at end of
         period                                     $24,869           $9,283

    Supplemental cash flow information:
      Cash paid for interest, net of amount
       capitalized                                  $37,785          $44,341



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

                                        Three Months Ended   Six Months Ended
                                              June 30,           June 30,
    (Unaudited)                            2006     2005      2006      2005

    Reconciliation of Operating Income
     to EBITDA
    Operating income                    $212,596  $53,464  $312,452  $117,002
    Depreciation and amortization         39,282   21,541    66,752    43,023
    Equity earnings from investments      18,004    4,418    49,817     8,895
    Other income (expense) excluding
     AFUDC                                (1,981)     730    (1,027)    1,230
    Discontinued operations                  ---      332       ---     1,007
      EBITDA                            $267,901  $80,485  $427,994  $171,157

    Reconciliation of Net Income to
     EBITDA
    Net income                          $196,199  $28,090  $266,703   $62,759
    Minority interest                        519    8,629     2,138    20,818
    Interest expense, net                 30,787   21,372    67,221    42,538
    Depreciation and amortization         39,282   21,541    66,752    43,023
    Income taxes                           1,284      971    25,478     2,155
    AFUDC                                   (170)    (118)     (298)     (136)
      EBITDA                            $267,901  $80,485  $427,994  $171,157

    Reconciliation of EBITDA to
     Distributable Cash Flow
    EBITDA                              $267,901  $80,485  $427,994  $171,157
    Gain on sale of assets              (113,877)     ---  (114,865)      ---
    Interest expense, net                (30,787) (21,372)  (67,221)  (42,538)
    Maintenance capital                  (14,955)  (6,967)  (21,904)  (13,002)
    Distributions to minority interest       ---  (15,713)     (147)  (31,943)
    Equity earnings from investments     (18,004)  (4,418)  (49,817)   (8,895)
    Distributions received from
     investments                          29,111    1,466    69,819     2,653
    Distributable cash flow to ONEOK
     for partial year ownership              ---      ---   (85,817)      ---
    Current income tax expense and
     other                                   360       39    13,603       203
      Distributable Cash Flow           $119,749  $33,520  $171,645   $77,635



     ONEOK Partners, L.P. and Subsidiaries
     Summary Segment Information (Unaudited)
     Gathering and Processing Segment
                                        Three Months Ended  Six Months Ended
                                              June 30,           June 30,
    Financial Results                       2006   2005 (A)   2006    2005 (A)
                                                (Thousands of dollars)

    Natural gas liquids and condensate
     sales                               $162,741  $26,581  $312,152  $51,045
    Gas sales                             152,238   23,806   370,899   46,098
    Gathering, compression, dehydration
     and processing fees and other
     revenue                               32,895   10,652    65,563   21,469
    Cost of sales and fuel                254,526   35,466   563,405   67,931
      Net margin                           93,348   25,573   185,209   50,681
    Operating costs                        36,568   10,754    71,316   22,402
    Depreciation and amortization          10,501    3,978    21,068    7,936
      Operating income                    $46,279  $10,841   $92,825  $20,343

    Reconciliation of Operating Income
     to EBITDA
    Operating income                      $46,279  $10,841   $92,825  $20,343
    Depreciation and amortization          10,501    3,978    21,068    7,936
    Equity earnings from investments        5,276    4,251    10,698    8,255
    Other income (expense)                  2,351       63     2,932      305
      EBITDA                              $64,407  $19,133  $127,523  $36,839

    Operating Information
    Total gas gathered (BBtu/d)             1,142      277     1,149      289
    Total gas processed (BBtu/d)              993       91       958       89
    Natural gas liquids sales (MBbl/d)         41        8        41        8
    Natural gas liquids produced
     (MBbl/d)                                  53        8        52        8
    Gas sales (BBtu/d)                        288       45       298       43
    Capital expenditures (Thousands of
     dollars)                             $14,581   $4,180   $22,398   $8,127
    Realized composite NGL sales price
     ($/gallon)                             $0.96    $0.86     $0.91    $0.85
    Realized condensate sales price
     ($/Bbl)                               $59.83     $---    $58.65     $---
    Realized natural gas sales price
     ($/MMBtu)                              $5.81    $5.87     $6.88    $5.90
    Realized gross processing spread
     ($/MMBtu)                              $6.11     $---     $4.70     $---

     (A) Excludes results related to the acquisition of the ONEOK gathering
         and processing assets.



     ONEOK Partners, L.P. and Subsidiaries
     Summary Segment Information (Unaudited)
     Natural Gas Liquids Segment
                                            Three Months     Six Months
                                               Ended           Ended
    Financial Results                      June 30, 2006    June 30, 2006
                                              (Thousands of dollars)

    Natural gas liquids and condensate
     sales                                    $827,368      $1,607,196
    Storage and fractionation revenue           54,157          93,752
    Cost of sales and fuel                     830,980       1,616,660
      Net margin                                50,545          84,288
    Operating costs                             15,945          27,170
    Depreciation and amortization                5,368          10,767
      Operating income                         $29,232         $46,351

    Reconciliation of Operating Income to
     EBITDA
    Operating income                           $29,232         $46,351
    Depreciation and amortization                5,368          10,767
    Equity earnings from investments               ---             ---
    Other income (expense)                         485             354
      EBITDA                                   $35,085         $57,472

    Operating Information
    Natural gas liquids gathered (MBbl/d)          213             203
    Natural gas liquids sales (MBbl/d)             199             203
    Natural gas liquids fractionated
     (MBbl/d)                                      333             309
    Capital expenditures (Thousands of
     dollars)                                   $5,023          $7,977



     ONEOK Partners, L.P. and Subsidiaries
     Summary Segment Information (Unaudited)
     Pipelines and Storage Segment
                                             Three Months     Six Months
                                                Ended           Ended
    Financial Results                       June 30, 2006   June 30, 2006
                                              (Thousands of dollars)

    Transportation and gathering revenue        $44,317        $90,145
    Storage revenue                              13,014         25,158
    Gas sales and other revenue                   1,940          6,880
    Cost of sales and fuel                        8,630         19,421
      Net margin                                 50,641        102,762
    Operating costs                              18,083         34,873
    Depreciation and amortization                 7,558         15,141
    Gain on sale of assets                          ---            988
      Operating income                          $25,000        $53,736

    Reconciliation of Operating Income to
     EBITDA
    Operating income                            $25,000        $53,736
    Depreciation and amortization                 7,558         15,141
    Equity earnings from investments                 25            269
    Other income (expense)                         (131)           195
      EBITDA                                    $32,452        $69,341

    Operating Information
    Natural gas transported (MMcf)              112,998        245,533
    Natural gas liquids transported
     (MBbl/d)                                       208            201
    Natural gas liquids gathered (MBbl/d)            58             57
    Capital expenditures (Thousands of
     dollars)                                   $11,914        $15,490
    Average natural gas price
      Midcontinent region  ($/MMBtu)              $5.57          $6.40



     ONEOK Partners, L.P. and Subsidiaries
     Summary Segment Information (Unaudited)
     Interstate Natural Gas Pipelines Segment
                                            Three Months        Six Months
                                                Ended              Ended
                                               June 30,           June 30,
    Financial Results                       2006     2005      2006      2005
                                               (Thousands of dollars)

    Transportation revenue               $23,230  $82,541   $48,783  $179,186
    Cost of sales and fuel                   ---      ---       ---       ---
      Net margin                          23,230   82,541    48,783   179,186
    Operating costs                        8,384   22,028    17,122    46,466
    Depreciation and amortization          3,613   16,598     7,362    33,167
    Gain on sale of asset                113,877      ---   113,877       ---
      Operating income                  $125,110  $43,915  $138,176   $99,553

    Reconciliation of Operating
     Income to EBITDA
    Operating income                    $125,110  $43,915  $138,176   $99,553
    Depreciation and amortization          3,613   16,598     7,362    33,167
    Equity earnings from investments      12,703      167    38,850       640
    Other income (expense)                    13      554        61       697
      EBITDA                            $141,439  $61,234  $184,449  $134,057

    Operating Information (A)
    Natural gas delivered (MMcf)         257,482  257,171   562,761   563,864
    Natural gas average throughput
     (MMcf/d)                              2,878    2,889     3,172     3,193
    Capital expenditures (Thousands of
     dollars)                             $3,783   $7,656    $6,905   $13,066

     (A) Includes 100 percent of the volumes for joint venture investments.



     ONEOK Partners, L.P. and Subsidiaries                       Attachment A
     EARNINGS GUIDANCE *

                                              Year Ending December 31, 2006
                                             Previous     Updated
                                             Guidance    Guidance    Change
                                       (In millions, except per unit amounts)
    Operating Income
       Gathering and Processing                 $142        $160        $18
       Interstate Pipelines                       20          44         24
       Pipelines and Storage                      85          95         10
       Natural Gas Liquids                        93          89         (4)
       Coal Slurry and Other                     (10)        (25)       (15)
       Gain on sale of assets                    108         114          6
    Operating Income                             438         477         39
    Equity earnings from investments              96          94         (2)
    Other income (expense)                       ---          (3)        (3)
    Interest expense                             (95)       (134)       (39)
    Income taxes                                  (3)        (26)       (23)
    Net Income                                  $436        $408       $(28)

    Net Income                                  $436        $408       $(28)
    Income allocated to ONEOK related to
     partial year ownership                      (66)        (36)        30
    Income allocated to general partner          (34)        (35)        (1)
    Limited Partners' Interest in Net
     Income                                     $336        $337         $1

    Net Income Per Unit                        $4.56       $4.56       $---
    Average Units Outstanding                   73.7        73.8        0.1

    Reconciliation of Net Income to
     EBITDA
    Net income                                  $436        $408       $(28)
    Minority interest                            ---           2          2
    Interest expense, net                         95         134         39
    Depreciation and amortization                106         123         17
    Income taxes                                   3          26         23
    AFUDC                                        ---         ---        ---
    EBITDA                                      $640        $693        $53

    Reconciliation of EBITDA to
     Distributable Cash Flow
    EBITDA                                      $640        $693        $53
    Gain on sale of assets                      (108)       (114)        (6)
    Interest expense, net                        (95)       (134)       (39)
    Maintenance capital                          (52)        (61)        (9)
    Distributions to minority interest           ---         ---        ---
    Equity earnings from investments             (96)        (94)         2
    Distributions received from equity
     investments                                 119         118         (1)
    Distributable cash flow to ONEOK for
    partial year ownership                       (77)        (86)        (9)
    Current income tax expense and other           3          14         11
    Distributable Cash Flow                     $334        $336         $2

    Distributable Cash Flow per Unit           $4.09       $4.09       $---

     *  Amounts shown are midpoints of ranges provided


     Analyst Contact:  Ellen Konsdorf
                       877-208-7318
     Media Contact:    Beth Jensen
                       402-492-3400

OKS-FE



SOURCE ONEOK Partners, L.P. 

analysts, Ellen Konsdorf, +1-877-208-7318, or media, Beth Jensen, +1-402-492-3400,
both of ONEOK Partners, L.P.

http://www.prnewswire.com