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<TITLE>SECURITIES AND EXCHANGE COMMISSION</TITLE>
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<FONT SIZE=4><P ALIGN="CENTER">SECURITIES AND EXCHANGE COMMISSION</P>
<P ALIGN="CENTER">Washington, D.C. 20549</P>
<P ALIGN="CENTER"></P>
<B><P ALIGN="CENTER">FORM 8-K</P>
</B><P ALIGN="CENTER"></P>
<P ALIGN="CENTER">CURRENT REPORT</P>
<P ALIGN="CENTER">PURSUANT TO SECTION 13 OR 15(d) OF THE</P>
<P ALIGN="CENTER">SECURITIES EXCHANGE ACT OF 1934</P>
<P ALIGN="CENTER"></P></FONT>
<P ALIGN="CENTER"><CENTER><TABLE CELLSPACING=0 BORDER=0 CELLPADDING=7 WIDTH=324>
<TR><TD WIDTH="57%" VALIGN="TOP">
<FONT SIZE=2><P>(Date of report)</FONT></TD>
<TD WIDTH="43%" VALIGN="TOP">
<B><FONT SIZE=3><P>March 22, 2007 </B></FONT></TD>
</TR>
<TR><TD WIDTH="57%" VALIGN="TOP">
<FONT SIZE=2><P>(Date of earliest event reported)</FONT></TD>
<TD WIDTH="43%" VALIGN="TOP">
<B><FONT SIZE=3><P>March 20, 2007</B></FONT></TD>
</TR>
</TABLE>
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<B><FONT SIZE=5><P ALIGN="CENTER">ONEOK PARTNERS, L.P.</P>
</B></FONT><FONT SIZE=2><P ALIGN="CENTER">(Exact name of registrant as specified in its charter)</P>
</FONT><P ALIGN="CENTER"></P>
<TABLE CELLSPACING=0 BORDER=0 CELLPADDING=7 WIDTH=686>
<TR><TD WIDTH="30%" VALIGN="TOP" HEIGHT=19>
<B><P ALIGN="CENTER">Delaware</B></TD>
<TD WIDTH="6%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="31%" VALIGN="TOP" HEIGHT=19>
<B><P ALIGN="CENTER">1-12202</B></TD>
<TD WIDTH="5%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="28%" VALIGN="TOP" HEIGHT=19>
<B><P ALIGN="CENTER">93-1120873</B></TD>
</TR>
<TR><TD WIDTH="30%" VALIGN="TOP" HEIGHT=19>
<FONT SIZE=2><P ALIGN="CENTER">(State or other jurisdiction</FONT></TD>
<TD WIDTH="6%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="31%" VALIGN="TOP" HEIGHT=19>
<FONT SIZE=2><P ALIGN="CENTER">(Commission</FONT></TD>
<TD WIDTH="5%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="28%" VALIGN="TOP" HEIGHT=19>
<FONT SIZE=2><P ALIGN="CENTER">(IRS Employer</FONT></TD>
</TR>
<TR><TD WIDTH="30%" VALIGN="TOP" HEIGHT=19>
<FONT SIZE=2><P ALIGN="CENTER">of incorporation)</FONT></TD>
<TD WIDTH="6%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="31%" VALIGN="TOP" HEIGHT=19>
<FONT SIZE=2><P ALIGN="CENTER">File Number)</FONT></TD>
<TD WIDTH="5%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="28%" VALIGN="TOP" HEIGHT=19>
<FONT SIZE=2><P ALIGN="CENTER">Identification No.)</FONT></TD>
</TR>
</TABLE>
<P ALIGN="CENTER"></P>
<B><P ALIGN="CENTER">100 West Fifth Street; Tulsa, OK</P>
</B><FONT SIZE=2><P ALIGN="CENTER">(Address of principal executive offices)</P>
</FONT><P ALIGN="CENTER"></P>
<B><P ALIGN="CENTER">74103-4298</P>
</B><FONT SIZE=2><P ALIGN="CENTER">(Zip code)</P>
</FONT><P ALIGN="CENTER"></P>
<B><P ALIGN="CENTER">(918) 588-7000</P>
</B><FONT SIZE=2><P ALIGN="CENTER">(Registrant's telephone number, including area code)</P>
</FONT><P ALIGN="CENTER"></P>
<B><P ALIGN="CENTER">Not Applicable</P>
</B><FONT SIZE=2><P ALIGN="CENTER">(Former name or former address, if changed since last report)</P>
</FONT>
<FONT SIZE=2><P>[] Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</P>
<P>[] Soliciting material pursuant to Rule 14a-12 under the Securities Act (17 CFR 240.14a-12)</P>
<P>[] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</P>
<P>[] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</P>
</FONT>
<P>&nbsp;</P>
<TABLE CELLSPACING=0 BORDER=0 CELLPADDING=7 WIDTH=666>
<TR><TD WIDTH="14%" VALIGN="TOP" HEIGHT=19>
<U><P>Item 8.01</U></TD>
<TD WIDTH="3%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="83%" VALIGN="TOP" HEIGHT=19>
<U><P>Other Events</U></TD>
</TR>
<TR><TD WIDTH="14%" VALIGN="TOP" HEIGHT=45><P></P></TD>
<TD WIDTH="3%" VALIGN="TOP" HEIGHT=45><P></P></TD>
<TD WIDTH="83%" VALIGN="TOP" HEIGHT=45>
<P>On March 20, 2007, we announced a $30 million expansion of our Grasslands natural gas processing facility in McKenzie County, North Dakota.  The expansion will increase the plant's capacity by approximately 60 percent.  The Grasslands natural gas processing facility is our largest natural gas processing plant in the Williston Basin, and is owned and operated by our wholly owned subsidiary, Bear Paw Energy, LLC.</P>
<P>The plant expansion, which is already under way, will increase natural gas processing capacity to approximately 100 million cubic feet per day (MMcfd) from its current capacity of approximately 63 MMcfd. As part of the project, the plant's fractionation equipment will be expanded, increasing fractionating capacity by 65 percent. The additions will come on line in phases starting in the summer of 2007 through the first quarter of 2008. </P>
<FONT SIZE=2></FONT></TD>
</TR>
<TR><TD WIDTH="14%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="3%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="83%" VALIGN="TOP" HEIGHT=19><P></P></TD>
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<TR><TD WIDTH="14%" VALIGN="TOP" HEIGHT=18>
<U><P>Item 9.01</U></TD>
<TD WIDTH="3%" VALIGN="TOP" HEIGHT=18><P></P></TD>
<TD WIDTH="83%" VALIGN="TOP" HEIGHT=18>
<U><P>Financial Statements and Exhibits</U></TD>
</TR>
<TR><TD WIDTH="14%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="3%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="83%" VALIGN="TOP" HEIGHT=19>
<P>Exhibits</TD>
</TR>
<TR><TD WIDTH="14%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="3%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="83%" VALIGN="TOP" HEIGHT=19><DIR>
<DIR>
<P>99.1      Press release issued by ONEOK Partners, L.P. dated March 20, 2007.</DIR>
</DIR>
</TD>
</TR>
<TR><TD WIDTH="14%" VALIGN="TOP" HEIGHT=18><P></P></TD>
<TD WIDTH="3%" VALIGN="TOP" HEIGHT=18><P></P></TD>
<TD WIDTH="83%" VALIGN="TOP" HEIGHT=18><P></P></TD>
</TR>
<TR><TD WIDTH="14%" VALIGN="TOP" HEIGHT=18><P></P></TD>
<TD WIDTH="3%" VALIGN="TOP" HEIGHT=18><P></P></TD>
<TD WIDTH="83%" VALIGN="TOP" HEIGHT=18><P></P></TD>
</TR>
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<FONT SIZE=2><P ALIGN="CENTER">2</P>
</FONT><P ALIGN="CENTER"></P>
<P ALIGN="CENTER">&nbsp;</P>
<P ALIGN="CENTER">&nbsp;</P>
<P ALIGN="CENTER">&nbsp;</P>
<P ALIGN="CENTER">&nbsp;</P>
<P ALIGN="CENTER">&nbsp;</P>
<P ALIGN="CENTER">&nbsp;</P>
<P ALIGN="CENTER">&nbsp;</P>
<P ALIGN="CENTER">&nbsp;</P>
<P ALIGN="CENTER">&nbsp;</P>
<P ALIGN="CENTER">&nbsp;</P>
<P ALIGN="CENTER">SIGNATURE</P>
<P>Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.</P>
<TABLE CELLSPACING=0 BORDER=0 CELLPADDING=7 WIDTH=686>
<TR><TD WIDTH="9%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="47%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="7%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="37%" VALIGN="TOP" HEIGHT=19>
<P>ONEOK Partners, L.P.</P>
<P>By:  ONEOK Partners GP, L.L.C., General Partner</TD>
</TR>
<TR><TD WIDTH="9%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="47%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="7%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="37%" VALIGN="TOP" HEIGHT=19><P></P></TD>
</TR>
<TR><TD WIDTH="9%" VALIGN="TOP" HEIGHT=20>
<P>Date:</TD>
<TD WIDTH="47%" VALIGN="TOP" HEIGHT=20>
<P>March 22, 2007</TD>
<TD WIDTH="7%" VALIGN="TOP" HEIGHT=20>
<P>By:</TD>
<TD WIDTH="37%" VALIGN="TOP" HEIGHT=20>
<U><P>/s/ Curtis Dinan</U></TD>
</TR>
<TR><TD WIDTH="9%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="47%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="7%" VALIGN="TOP" HEIGHT=19><P></P></TD>
<TD WIDTH="37%" VALIGN="TOP" HEIGHT=19>
<P>Curtis Dinan</TD>
</TR>
<TR><TD WIDTH="9%" VALIGN="TOP" HEIGHT=20><P></P></TD>
<TD WIDTH="47%" VALIGN="TOP" HEIGHT=20><P></P></TD>
<TD WIDTH="7%" VALIGN="TOP" HEIGHT=20><P></P></TD>
<TD WIDTH="37%" VALIGN="TOP" HEIGHT=20>
<P>Senior Vice President - </P>
<P>Chief Financial Officer</P>
<P>and Treasurer</P>
</TD>
</TR>
</TABLE>
<FONT SIZE=2><P>&nbsp;</P>
<P>&nbsp;</P>
<P>&nbsp;</P>
<P ALIGN="CENTER">3</P>
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{"company-data": {"conformed-name": "ONEOK Partners LP", "cik": "0000909281", "assigned-sic": "4922", "irs-number": "931120873", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-12202", "film-number": "07712193"}, "business-address": {"street1": "100 WEST FIFTH STREET", "city": "TULSA", "state": "OK", "zip": "74103", "phone": "918-588-7000"}, "mail-address": {"street1": "100 WEST FIFTH STREET", "city": "TULSA", "state": "OK", "zip": "74103"}, "former-company": {"former-conformed-name": "NORTHERN BORDER PARTNERS LP", "date-changed": "19930719"}}
SECURITIES AND EXCHANGE COMMISSION
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934
(Date of report)
March 22, 2007
(Date of earliest event reported)
March 20, 2007
ONEOK PARTNERS, L.P.
(Exact name of registrant as specified in its charter)
Delaware
1-12202
93-1120873
(State or other jurisdiction
(Commission
(IRS Employer
of incorporation)
File Number)
Identification No.)
100 West Fifth Street; Tulsa, OK
(Address of principal executive offices)
74103-4298
(Zip code)
(918) 588-7000
(Registrant's telephone number, including area code)
Not Applicable
(Former name or former address, if changed since last report)
[] Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
[] Soliciting material pursuant to Rule 14a-12 under the Securities Act (17 CFR 240.14a-12)
[] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
[] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 8.01
Other Events
On March 20, 2007, we announced a $30 million expansion of our Grasslands natural gas processing facility in McKenzie County, North Dakota.  The expansion will increase the plant's capacity by approximately 60 percent.  The Grasslands natural gas processing facility is our largest natural gas processing plant in the Williston Basin, and is owned and operated by our wholly owned subsidiary, Bear Paw Energy, LLC.
The plant expansion, which is already under way, will increase natural gas processing capacity to approximately 100 million cubic feet per day (MMcfd) from its current capacity of approximately 63 MMcfd. As part of the project, the plant's fractionation equipment will be expanded, increasing fractionating capacity by 65 percent. The additions will come on line in phases starting in the summer of 2007 through the first quarter of 2008.
Item 9.01
Financial Statements and Exhibits
Exhibits
99.1      Press release issued by ONEOK Partners, L.P. dated March 20, 2007.
2
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.
ONEOK Partners, L.P.
By:  ONEOK Partners GP, L.L.C., General Partner
Date:
March 22, 2007
By:
/s/ Curtis Dinan
Curtis Dinan
Senior Vice President -
Chief Financial Officer
and Treasurer
3