Exhibit
99.1










April
      6,
      2009
                          
                          Analyst
      Contact:
                          Dan
      Harrison918-588-7950Media
      Contact:
                          Brad
      Borror918-588-7582




ONEOK
and ONEOK Partners Schedule First-quarter
 2009
Earnings Conference Call and Webcast
   TULSA,
Okla. – April 6, 2009 – ONEOK, Inc. (NYSE: OKE) and ONEOK Partners, L.P. (NYSE:
OKS) will release their first-quarter earnings after the market closes on April
29, 2009.
 
 A joint
conference call will be held the following day on April 30, 2009, at 11 a.m.
Eastern Daylight Time (10 a.m. Central Daylight Time). The call also will be
carried live on ONEOK’s and ONEOK Partners’ Web sites.
 
 ONEOK’s
and ONEOK Partners’ senior management teams will participate in the call and
webcast.
 
 What:ONEOK, Inc. and ONEOK Partners, L.P. first-quarter earnings conference
call and webcast
 
 When:11
a.m. Eastern, April 30, 2009
 10 a.m.
Central
 
 Where:1) Phone
conference call 866-259-6033, pass code 1350009
 2) Log on
to the webcast at www.oneok.com
 3) Log on
to the webcast at www.oneokpartners.com
 
 If you
are unable to participate in the conference call or the webcast, the replay will
be available on ONEOK’s Web site, www.oneok.com, and ONEOK Partners’ Web site,
www.oneokpartners.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
1350009.
  
  
  ONEOK
and ONEOK Partners Schedule First-quarter
 2009
Earnings Conference Call and Webcast
  Page
2
 
 ONEOK,
Inc. (NYSE: OKE) is a diversified energy company. We are the general partner and
own 47.7 percent of ONEOK Partners, L.P. (NYSE: OKS), one of the largest
publicly traded master limited partnerships, which 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. ONEOK
is among the largest natural gas distributors in the United States, serving more
than 2 million customers in Oklahoma, Kansas and Texas. Our energy services
operation focuses primarily on marketing natural gas and related services
throughout the U.S. ONEOK is a Fortune 500 company.
 
 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 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.
OKE-FV OKS-FV
 
 ###