Exhibit
99.1










July
      22, 2010
              Analyst
      Contact:
              Andrew ZiolaMedia
      Contact:
              918-588-7163
                Megan
      Washbourne
                918-588-7572





ONEOK
Partners Receives Notification from Williams to Increase


Ownership
in Overland Pass Pipeline Company





TULSA, Okla.
– July 22, 2010 – ONEOK Partners, L.P. (NYSE: OKS) announced today that it
received notification that Williams Partners L.P. (NYSE: WPZ) has elected to
exercise its option to increase its ownership of Overland Pass Pipeline Company,
LLC to 50 percent from 1 percent.




The
joint-venture company was established in May 2006 to build the Overland Pass
Pipeline, a 760-mile natural gas liquids (NGL) pipeline from Opal, Wyo., to the
Mid-Continent natural gas liquids market center in Conway, Kan., one of the
nation’s primary NGL distribution and storage hubs. Currently, ONEOK Partners
owns 99 percent of the joint venture and Williams owns the remaining 1
percent.




The pipeline,
which went into service in November 2008, can transport approximately 140,000
barrels per day with the ability to expand capacity to 255,000 barrels per day
with additional pump facilities.




“With this
transaction and our strong partnership with Williams, we do not expect this
change in ownership to affect our continuing efforts to grow Overland Pass
Pipeline and provide the services our customers expect from us,” said Terry K.
Spencer, ONEOK Partners chief operating officer.




Upon closing
of the transaction and as long as Williams owns at least 50 percent of Overland
Pass Pipeline Company, Williams will have the option to become the operator by
providing ONEOK Partners at least 30 days notice.




ONEOK
Partners and Williams have 30 days to complete the transaction, which is
effective June 30, 2010, subject to obtaining the necessary regulatory
approvals.




As a result
of the increase in Williams’ ownership in the joint-venture company, ONEOK
Partners will receive approximately $425 million at closing in accordance with
the joint venture’s operating agreement. ONEOK Partners will use the proceeds
from the transaction to repay short-term debt and to fund its recently announced
capital projects.




-more-


ONEOK Partners Receives Notification from Williams to
Increase
 Ownership in Overland Pass Pipeline Company
  Page 2


This
transaction is not expected to affect the partnership’s 2010 net income guidance
of $450 million to $490 million.
  Overland Pass
Pipeline Company, LLC includes the Piceance Lateral Pipeline, a 150-mile
pipeline connecting the Piceance Basin to the Overland Pass Pipeline, and the
D-J Basin Lateral Pipeline, a 125-mile pipeline connecting the Denver-Julesberg
Basin with the Overland Pass Pipeline. ONEOK Partners, through its subsidiaries,
managed the construction projects and is the operator of the
pipelines.
  ONEOK
Partners owns an extensive natural gas liquids system in the Mid-Continent,
including fractionators and storage, in Mont Belvieu, Texas, Conway and
Hutchinson, Kan., and Medford, Okla. It also owns interstate natural gas liquids
distribution pipelines between Conway and Mont Belvieu.
  
 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 42.8 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.
  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 Exchange Act, 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,” “guidance,” “could,” “may,” “continue,”
“might,” “potential,” “scheduled” and other words and terms of similar
meaning.
  The
forward looking statements in this news release relating to the estimated costs
and completion schedules as well as anticipated EBITDA and distribution levels
with respect to the referenced growth construction projects are subject to known
and unknown risks, uncertainties and other factors that may cause actual project
costs and completion schedules and associated EBITDA and distribution levels to
be materially different from those included in the forward looking statements.
These risks and uncertainties include, but are not limited to, timely receipt of
necessary governmental approvals and permits, our ability to control the costs
of construction, including costs of materials, labor, [and right-of-way], and
other factors that may impact our ability to complete these projects within
budget and on schedule.
  OKS-PP
OKE-PP
   ###