ONEOK Partners Announces Open Season for Natural Gas Storage Capacity at Texas Storage...

ONEOK Partners Announces Open Season for Natural Gas Storage Capacity at Texas
Storage Field

TULSA, Okla., June 24 /PRNewswire-FirstCall/ -- ONEOK Partners, L.P. (NYSE:
OKS) announced today that its subsidiary, ONEOK Texas Gas Storage, L.L.C.
(OTGS), is holding a non-binding open-season bidding process, which begins
June 25, 2009, and concludes July 22, 2009, for firm intrastate natural gas
storage at its Loop, Texas, natural gas storage facility.

The open season for this natural gas storage capacity provides customers with
the opportunity to bid for up to 5.5 billion cubic feet (Bcf) of storage
capacity that will be available with the reactivation of the storage field.

"If there is sufficient interest in the capacity, ONEOK Partners will
reactivate our Loop storage field," said Pierce Norton, executive vice
president - natural gas of ONEOK Partners. The additional storage space is
currently projected to be available in April 2011.

OTGS currently owns and operates fully leased salt and reservoir storages with
combined capacities of 4.7 Bcf. The reactivated storage will add an
additional 5.5 Bcf of storage to OTGS's existing capacity.

OTGS storage can be accessed by shippers on ONEOK WesTex Transmission, L.L.C.
(OWT), a Texas intrastate pipeline serving west Texas local distribution
companies, electrical power generators and industrial markets from the
northern Texas Panhandle, south through Lubbock, and continuing to delivery
points in the Big Spring-Midland-Odessa corridor and El Paso markets. In
addition, OWT currently has nine major pipeline interconnects in the active
Waha, Texas, market hub.

For information regarding OTGS's open season, please contact Mike Onderick at
918-588-7404 / monderick@oneok.com.

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.

For more information, visit the Web site at www.oneokpartners.com.

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

OKS-PP

SOURCE ONEOK Partners, L.P.

Analysts, Christy Williamson, +1-918-588-7163, or media, Megan Washbourne,
+1-918-588-7572, both of ONEOK, Inc.