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Exhibit 21

ENTITY						JURISDICTION
Alliance Canada Marketing L.P.						Alberta
Alliance Canada Marketing LTD						Alberta
Appalachia Midstream Services, L.L.C.						Oklahoma
Aurora Hydrogen Inc.						Alberta
Aux Sable Liquid Products Inc.						Delaware
Aux Sable Liquid Products LP						Delaware
Aux Sable Midstream LLC						Delaware
BPEH-CXL Holdings LLC						Delaware
Bargath LLC						Delaware
Baton Rouge Fractionators LLC						Delaware
Baton Rouge Pipeline LLC						Delaware
Black Marlin Pipeline LLC						Texas
Blue Racer Midstream, LLC						Delaware
Blue Racer Midstream Holdings, LLC						Delaware
Blue Racer Midstream Intermediate Holdings, LLC						Delaware
Bluebonnet Market Express LLC						Delaware
Bluestem Gas Services, L.L.C.						Oklahoma
Bluestem Pipeline LLC						Delaware
Branch Midstream Company, LLC						Texas
Brazos Permian II, LLC						Delaware
Carbon County UCG, Inc.						Delaware
Carbonate Trend Pipeline LLC						Delaware
Cardinal Gas Services, L.L.C.						Delaware
Cardinal Operating Company, LLC						Delaware
Cardinal Pipeline Company, LLC						North Carolina
DMP NEW YORK, INC.						New York
Discovery Gas Transmission LLC						Delaware
Discovery Producer Services LLC						Delaware
Emerging Energy Ventures, LLC						Delaware
Encino Environmental Holdings LLC						Delaware
Endeavor Gathering LLC						Delaware
Fossett Columbine, LLC						Delaware
Gemini Arklatex, LLC						Delaware
Gemini Arklatex Services, LLC						Delaware
Gemini Carthage Pipeline, LLC						Delaware
Gulfstar One LLC						Delaware
Gulfstream Management & Operating Services, L.L.C.						Delaware
Gulfstream Natural Gas System, L.L.C.						Delaware
Hill-Lake Gas Storage, LLC						Texas
Inland Ports, Inc.						Tennessee

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Exhibit 21

ENTITY						JURISDICTION
Katy Connector Pipeline, LLC						Delaware
Kiowa Lateral LLC						Delaware
Laurel Mountain Midstream Operating LLC						Delaware
Laurel Mountain Midstream, LLC						Delaware
Louisiana Energy Gateway LLC						Delaware
Louisiana Midstream Gas Services, L.L.C.						Oklahoma
Magnolia Midstream Gas Services, L.L.C.						Oklahoma
Marsh Resources, LLC						Delaware
Mid-Continent Fractionation and Storage, LLC						Delaware
Mockingbird Midstream Gas Services, L.L.C.						Oklahoma
Monarch Pipeline LLC						Delaware
MountainWest Energy Holding Company, LLC						Utah
MountainWest Energy Services, LLC						Utah
MountainWest Field Services, LLC						Utah
MountainWest Overthrust Pipeline, LLC						Utah
MountainWest Pipeline Services, LLC						Utah
MountainWest Pipeline, LLC						Utah
MountainWest Pipelines Holding LLC						Delaware
MountainWest Southern Trails Pipeline Company						Utah
MountainWest White River Hub, LLC						Utah
NT Minerals, LLC						Texas
New Energy Ventures Holdco, LLC						Delaware
NorTex Development Company, LLC						Delaware
NorTex Midstream Holdings, LLC						Delaware
NorTex Midstream Partners, LLC						Delaware
NorTex Trading and Marketing, LLC						Texas
Northwest Pipeline LLC						Delaware
Ohio Valley Midstream LLC						Delaware
Oklahoma Midstream Gas Services, L.L.C.						Oklahoma
Orbital Sidekick, Inc.						Delaware
Overland Pass Pipeline Company LLC						Delaware
Pacific Connector Gas Pipeline, LP						Delaware
Parachute Pipeline LLC						Delaware
Permian Connector, LLC						Delaware
Pine Needle LNG Company, LLC						North Carolina
Pine Needle Operating Company, LLC						Delaware
Ponder Midstream Gas Services, L.L.C.						Delaware
Reserveco Inc.						Delaware
Rocky Mountain Midstream Holdings LLC						Delaware
Rocky Mountain Midstream JV Holdings LLC						Delaware
Rocky Mountain Midstream LLC						Texas

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Exhibit 21

ENTITY						JURISDICTION
Rocky Mountain Midstream Marketing LLC						Texas
Rocky Mountain Midstream Pipeline LLC						Texas
Rocky Mountain Midstream Water LLC						Texas
Sequent Energy Canada LLC						Delaware
Sequent Energy Management LLC						Delaware
Socagee Midstream Gas Services LLC						Delaware
South Mansfield E&P, LLC						Delaware
Star Gathering, LLC						Delaware
TWC Holdings C.V.						Netherlands
Targa Train 7 LLC						Delaware
Texas Midstream Gas Services, L.L.C.						Oklahoma
The Williams Companies Foundation, Inc.						Oklahoma
The Williams Companies International Holdings B.V.						Dutch BV
Three Rivers Midstream LLC						Delaware
TransCardinal Company, LLC						Delaware
TransCarolina LNG Company, LLC						Delaware
Transco Exploration Company						Delaware
Transcontinental Gas Pipe Line Company, LLC						Delaware
UEOM NGL Pipelines LLC						Delaware
Utica East Ohio Midstream LLC						Delaware
Utica Gas Services, L.L.C.						Oklahoma
WFS - Liquids LLC						Delaware
WFS Gathering Company, L.L.C.						Delaware
Wamsutter LLC						Delaware
Wamsutter E&P, LLC						Delaware
White River Hub, LLC						Delaware
WilPro Energy Services (El Furrial) Limited						Cayman Islands
WilPro Energy Services (Pigap II) Limited						Cayman Islands
Williams ACM Holdings ULC						British Columbia
Williams Acquisition Holding Company LLC						New Jersey
Williams Alaska Petroleum, Inc.						Alaska
Williams Blu Operating LLC						Delaware
Williams CRE LLC						Delaware
Williams CV Holdings LLC						Delaware
Williams Compression LLC						Oklahoma
Williams Energy Solutions LLC						Delaware
Williams Express LLC						Delaware
Williams Express, Inc.						Alaska
Williams Field Services - Gulf Coast Company LLC						Delaware
Williams Field Services Company, LLC						Delaware

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Exhibit 21

ENTITY						JURISDICTION
Williams Field Services Group, LLC						Delaware
Williams Flexible Generation, LLC						Delaware
Williams Front Range LLC						Delaware
Williams Gas Processing - Gulf Coast Company LLC						Delaware
Williams Gilcrest, LLC						Delaware
Williams Global Energy (Cayman) Limited						Cayman Islands
Williams Global Holdings LLC						Delaware
Williams Headquarters Building LLC						Delaware
Williams Holdings and Manufacturing LLC						Delaware
Williams Hutch Rail Company, LLC						Delaware
Williams Information Technology LLC						Delaware
Williams International Company LLC						Delaware
Williams International El Furrial Limited						Cayman Islands
Williams International Pigap Limited						Cayman Islands
Williams International Venezuela Limited						Cayman Islands
Williams LNG, LLC						Delaware
Williams Laurel Mountain, LLC						Delaware
Williams MLP Operating, LLC						Delaware
Williams Midstream Gas Services LLC						Oklahoma
Williams Mobile Bay Producer Services, L.L.C.						Delaware
Williams Ohio River Valley Corporation						Delaware
Williams Ohio River Valley LLC						Delaware
Williams Ohio Valley Midstream LLC						Texas
Williams Ohio Valley Pipeline LLC						Delaware
Williams Oil Gathering, L.L.C.						Delaware
Williams PERK, LLC						Delaware
Williams Pacific Connector Gas Operator, LLC						Delaware
Williams Partners Operating LLC						Delaware
Williams Petroleum Services, LLC						Delaware
Williams Pipeline Services LLC						Delaware
Williams Propylene Company LLC						Delaware
Williams Resource Center, L.L.C.						Delaware
Williams Rocky Mountain Midstream Holdings LLC						Delaware
Williams Rocky Mountain Midstream Operating LLC						Delaware
Williams Solar Holdco LLC						Delaware
Williams Strategic Sourcing Company LLC						Delaware
Williams Upstream Holdings, LLC						Delaware
Williams WPC - I, LLC						Delaware
Worsham-Steed Gas Storage, LLC						Texas