EX-21 9 dex21.htm SUBSIDIARIES OF THE REGISTRANT Subsidiaries of the Registrant

Exhibit 21

Subsidiaries of ONEOK Partners, L.P.

 

Subsidiary

    State of
Incorporation
or Organization

Bear Paw Energy, LLC

    Delaware

Bear Paw Investments, LLC

    Delaware

Bear Paw Processing (Canada) Ltd.

    Alberta

Black Mesa Holdings, Inc.

    Delaware

Black Mesa Pipeline, Inc.

    Delaware

Black Mesa Pipeline Operations, L.L.C.

    Delaware

Black Mesa Pipeline Technologies, Inc.

    Oklahoma

Black Mesa Pipeline Technologies Services, L.L.C. (50%)1

    Oklahoma

Brown Bear Enterprises, LLC

    Delaware

Border Midstream Services, Ltd.

    Alberta

Border Midwestern Company

    Delaware

Border Minnesota Pipeline, LLC

    Delaware

Border Viking Company

    Delaware

Crestone Bighorn, L.L.C.

    Delaware

Crestone Energy Ventures, L.L.C. 2

    Delaware

Crestone Gathering Services, L.L.C. 2

    Delaware

Crestone Powder River, L.L.C. 3

    Delaware

Crestone Wind River, L.L.C.4

    Delaware

Chisholm Pipeline Company (50%)

    Delaware

Chisholm Pipeline Holdings, L.L.C.

    Delaware

Guardian Pipeline, L.L.C.

    Delaware

Mid Continent Market Center, L.L.C.

    Kansas

Midwestern Gas Marketing Company

    Delaware

Midwestern Gas Transmission Company

    Delaware

Northern Border Pipeline Company

    Texas

OkTex Pipeline Company, L.L.C.

    Delaware

ONEOK Field Services Company, L.L.C.

    Oklahoma

ONEOK Gas Gathering, L.L.C.5

   Oklahoma

ONEOK Gas Storage Holdings, L.L.C.

    Delaware

ONEOK Gas Storage, L.L.C.

    Oklahoma

ONEOK Gas Transportation, L.L.C.

    Oklahoma

ONEOK ILP GP, L.L.C.

    Delaware

ONEOK Hydrocarbon, L.L.C.

    Delaware

ONEOK Hydrocarbon, L.P.

    Delaware

ONEOK Hydrocarbon GP, L.L.C.

    Delaware

ONEOK Hydrocarbon Holdings, L.L.C.

    Delaware

ONEOK Hydrocarbon Southwest, L.L.C.

    Delaware
1 Black Mesa Pipeline Technologies Services, L.L.C. owns 0.81% of China Pipeline Holdings, Ltd
2 Crestone Energy Ventures, L.L.C. owns 39% and Crestone Gathering Services, L.L.C. owns 10% of Bighorn Gas Gathering, L.L.C.
3 Crestone Powder River, L.L.C. owns 37.04% of Fort Union Gas Gathering, L.L.C.
4 Crestone Wind River, L.L.C. owns 35% of Lost Creek Gathering Company, L.L.C.
5 ONEOK Gas Gathering, L.L.C. owns 48.445% of Sycamore Gas System

Subsidiary

    State of
Incorporation
or Organization

ONEOK MB I, L.P.6

   Delaware

ONEOK Midstream Gas Supply, L.L.C.

    Oklahoma

ONEOK NGL Pipeline, L.P.

    Delaware

ONEOK Overland Pass Holdings, L.L.C.

    Oklahoma

ONEOK Partners Intermediate Limited Partnership

    Delaware

ONEOK Sayre Storage Company, L.L.C.

    Delaware

ONEOK Texas Gas Storage, L.P.

    Texas

ONEOK Transmission Company, L.L.C.

    Delaware

ONEOK Underground Storage Company, L.L.C.

    Kansas

ONEOK VESCO Holdings, L.L.C.7

   Delaware

ONEOK WesTex Transmission, L.P.

    Delaware

Overland Pass Pipeline Company LLC

    Delaware

Potato Hills Gas Gathering System (joint venture) (51%)

    Oklahoma

Viking Gas Transmission Company

    Delaware
6 ONEOK MB I, L.P. owns 80% of Mont Belvieu I Fractionation Facility
7 ONEOK VESCO Holdings, L.L.C. owns 10.1765% of Venice Energy Services Company, L.L.C.