ONEOK Partners Announces Common Units Public Offering

TULSA, Okla., June 16 /PRNewswire-FirstCall/ -- ONEOK Partners, L.P. (NYSE:
OKS) today announced a public offering of 5 million of its common units,
representing limited partner interests, subject to market and other
conditions. The units will be offered by ONEOK Partners pursuant to an
effective shelf registration statement on file with the Securities and
Exchange Commission.

ONEOK Partners expects to use the net proceeds, after deducting underwriting
discounts and commissions and expenses, from the common unit public offering
and the general partner's proportionate capital contribution to reduce the
debt outstanding under its $1 billion revolving credit facility and for
general partnership purposes.

UBS Investment Bank, Citigroup Global Markets Inc. and Merrill Lynch, Pierce,
Fenner & Smith Incorporated are acting as joint book-running managers.
Barclays Capital Inc., J.P. Morgan Securities Inc. and Morgan Stanley & Co.
Incorporated are acting as senior co-managers. RBC Capital Markets
Corporation, SMH Capital Inc., Stifel Nicolaus & Company, Incorporated, and
Tudor, Pickering, Holt & Co. Securities, Inc. are acting as junior
co-managers.

ONEOK Partners is expected to grant the underwriters a 30-day option to
purchase up to an additional 750,000 common units to cover over-allotments, if
any.

This news release is neither an offer to sell nor a solicitation of an offer
to buy any of these securities and shall not constitute an offer, solicitation
or sale in any jurisdiction in which such offer, solicitation or sale is
unlawful.

A copy of the prospectus and prospectus supplement may be obtained from the
underwriters as follows:

UBS Investment Bank
Attention: Prospectus Department
299 Park Avenue
New York, NY 10171
Toll free: 888-827-7275

Citi
Brooklyn Army Terminal
Attention: Prospectus Delivery Department
140 58th Street
Brooklyn, NY 11220
Toll free: 800-831-9146

Merrill Lynch
Attention: Prospectus Department
4 World Financial Center, Floor 5
New York, NY 10080

ONEOK Partners, L.P. (NYSE: OKS) is one of the largest publicly traded master
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 NGL supply in the Mid-Continent
and Rocky Mountain regions with key market centers. Its general partner is a
wholly owned subsidiary of ONEOK, Inc. (NYSE: OKE), a diversified energy
company, which owns 47.7 percent of the partnership. 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.

Some of the statements contained 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 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. These forward-looking statements are made in
reliance on the safe-harbor protections provided under the Private Securities
Litigation Reform Act of 1995.

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 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. These and other risks are described in greater
detail in Item 1A, Risk Factors, in our Annual Report on Form 10-K. 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-FI

SOURCE ONEOK Partners, L.P.

Dan Harrison, +1-918-588-7950, or Media, Megan Washbourne, +1-918-588-7572,
both of ONEOK Partners, L.P.