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Exhibit 21
THE WILLIAMS COMPANIES, INC. & AFFILIATES
March 1, 1995
Percent
Jurisdiction Owned by
of Immediate
Incorporation Parent
------------- ------
The Williams Companies, Inc. . . . . . . . . . . . . . . . . . . Delaware 62.60%
Apco Argentina Inc. . . . . . . . . . . . . . . . . . . . . . Cayman Islands 100%
Apco Properties Ltd. . . . . . . . . . . . . . . . . . . Cayman Islands 50%
Kern River Gas Supply Corporation . . . . . . . . . . . . . Delaware 50%
Kern River Service Corporation . . . . . . . . . . . . . . Delaware 100%
Langside Limited . . . . . . . . . . . . . . . . . . . . . Bermuda 100%
Northwest Pipeline Corporation . . . . . . . . . . . . . . Delaware 100%
Northwest Exploration Company . . . . . . . . . . . . . . . Delaware 100%
Realco Realty Corp. . . . . . . . . . . . . . . . . . . . . Delaware 100%
Realco of Crown Center, Inc. . . . . . . . . . . . . . . Delaware 100%
Realco of San Antonio, Inc. . . . . . . . . . . . . . . . Delaware 100%
Realco Realty Developments, Inc. . . . . . . . . . . . . Delaware 100%
Transco Energy Company* . . . . . . . . . . . . . . . . . . Delaware 60%
Tulsa Williams Company . . . . . . . . . . . . . . . . . . Delaware 100%
WTG Holdings, Inc. . . . . . . . . . . . . . . . . . . . . Delaware 100%
WCS Communications Systems, Inc. . . . . . . . . . . . . Delaware 100%
Williams Telecommunications Systems, Inc. . . . . . . . Delaware 100%
WCS, Inc. . . . . . . . . . . . . . . . . . . . . . Delaware 100%
WCS Microwave Services, Inc. . . . . . . . . . . . . Nevada 100%
Vyvx, Inc. . . . . . . . . . . . . . . . . . . . . . . . Delaware 100%
WilTel Financial Corporation . . . . . . . . . . . . . . . Delaware 100%
WilTel Technology Ventures, Inc. . . . . . . . . . . . . . Delaware 100%
Wilko, Inc. . . . . . . . . . . . . . . . . . . . . . . . . Delaware 100%
Williams Acquisition Holding Company, Inc. . . . . . . . . New Jersey 100%
Agrico Foreign Sales Corporation . . . . . . . . . . . . Guam 100%
Fishhawk Ranch, Inc. . . . . . . . . . . . . . . . . . . Florida 100%
Texasgulf Inc. . . . . . . . . . . . . . . . . . . . . . Delaware 15%
Williams Energy Company . . . . . . . . . . . . . . . . . . Delaware 100%
Williams Energy Ventures, Inc. . . . . . . . . . . . . . Delaware 100%
Carbon County UCG, Inc. . . . . . . . . . . . . . . . . Delaware 100%
Energy International Corporation . . . . . . . . . . . . Pennsylvania 100%
F T & T, Inc. . . . . . . . . . . . . . . . . . . . . . Delaware 100%
Nebraska Energy, L.L.C. . . . . . . . . . . . . . . . . Kansas 71%
Williams Brokering Services, Inc. . . . . . . . . . . . Delaware 100%
Williams Canadian Holding, Inc. . . . . . . . . . . . . Delaware 100%
Williams Energy Brokering Company . . . . . . . . . . . Delaware 100%
Williams Energy Derivatives and Trading Company . . . . Delaware 100%
Williams Energy Systems Company . . . . . . . . . . . . Delaware 100%
Williams Knowledge Systems, Inc. . . . . . . . . . . . Delaware 100%
Williams Producer's Services Company . . . . . . . . . . Delaware 100%
Williams U.S. Holding, Inc. . . . . . . . . . . . . . Delaware 100%
Williams Exploration Company . . . . . . . . . . . . . . . Delaware 100%
Rainbow Resources, Inc. . . . . . . . . . . . . . . . Colorado 100%
*The Exhibit 21 for Transco Energy Company & Affiliates is attached.
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Percent
Jurisdiction Owned by
of Immediate
Incorporation Parent
------------- ------
Williams Field Services Group, Inc. . . . . . . . . . . . . . Delaware 100%
Williams CNG Company . . . . . . . . . . . . . . . . . . . Delaware 100%
Williams Field Services Company . . . . . . . . . . . . . . Utah 100%
Williams Field Services - Michigan Company . . . . . . . . Delaware 100%
Williams Gas Company . . . . . . . . . . . . . . . . . . . Delaware 100%
Williams Gas Management Company . . . . . . . . . . . . . . Delaware 100%
Williams Gas Marketing Company . . . . . . . . . . . . . . Delaware 100%
Williams Gas Processing - Blanco, Inc. . . . . . . . . . . Delaware 100%
Williams Gas Processing Company . . . . . . . . . . . . . . Delaware 100%
Williams Gas Processing - Kansas Hugoton Company . . . . . Delaware 100%
Williams Gas Processing - Mid-Continent Region Company . . Delaware 100%
Williams Gas Processing - Wamsutter Company . . . . . . . . Delaware 100%
Williams Gas Supply Company . . . . . . . . . . . . . . . . Delaware 100%
Williams Power Company . . . . . . . . . . . . . . . . . . Delaware 100%
Williams Power Investments, Inc. . . . . . . . . . . . . . Delaware 100%
Williams Power Services, Inc. . . . . . . . . . . . . . . . Delaware 100%
Williams Production Company . . . . . . . . . . . . . . . . Delaware 100%
Williams Washington Power Services, Inc. . . . . . . . . . Delaware 100%
Williams Information Services Corporation . . . . . . . . . . . Delaware 100%
Williams International Company . . . . . . . . . . . . . . . . Delaware 100%
Williams International Ventures Company . . . . . . . . . . Delaware 100%
WEV, Inc. (New Zealand) . . . . . . . . . . . . . . . . Delaware 100%
Williams Energy Ventures Corporation (New Zealand) . . . Delaware 100%
Williams International Pipeline Company . . . . . . . . . . . . Delaware 100%
Williams International Pipeline Company - Colombia . . . . Delaware 100%
Williams Natural Gas Company . . . . . . . . . . . . . . . . . Delaware 100%
WNG - Kansas Hugoton, Inc. . . . . . . . . . . . . . . . . Delaware 100%
WNG - Oklahoma Hugoton, Inc. . . . . . . . . . . . . . . . Delaware 100%
WNG - Wamsutter, Inc. . . . . . . . . . . . . . . . . . . . Delaware 100%
Williams Gathering Company . . . . . . . . . . . . . . . . Delaware 100%
Williams Pipe Line Company . . . . . . . . . . . . . . . . . . Delaware 100%
WillBros Terminal Company . . . . . . . . . . . . . . . . . Delaware 100%
Williams Terminals Company . . . . . . . . . . . . . . . . Delaware 100%
Williams Relocation Services, Inc. . . . . . . . . . . . . . . Delaware 100%
Williams Storage Company . . . . . . . . . . . . . . . . . . . Delaware 100%
Williams Underground Gas Storage Company . . . . . . . . . . . Delaware 100%
Williams Western Holding Company, Inc. . . . . . . . . . . . . Delaware 100%
Northwest Alaskan Pipeline Company . . . . . . . . . . . . Delaware 100%
Northwest Argentina Corporation . . . . . . . . . . . . . . Utah 100%
Northwest Border Pipeline Company . . . . . . . . . . . . . Delaware 100%
Northern Border Partners, L.P. . . . . . . . . . . . . . Delaware(Limited Partnership) 4.375%
Northern Border Intermediate Limited Partnership . . . . Delaware(Limited Partnerehip) 0.175%
Northwest Land Company . . . . . . . . . . . . . . . . . . Delaware 100%
Williams Western Pipeline Company . . . . . . . . . . . . . . . Delaware 100%
Kern River Gas Transmission Company . . . . . . . . . . . . Texas(Partnership) 50%
WilMart, Inc. . . . . . . . . . . . . . . . . . . . . . . . . . Delaware 100%
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TRANSCO ENERGY COMPANY SUBSIDIARIES
% Owned State of
Subsidiary Name By Parent Incorporation
Energy Tech, Inc. 100.00 Delaware
Gasco Insurance Company Limited 100.00 Bermuda
Hazleton Fuel Management Company 100.00 Delaware
Hazleton Pipeline Company 100.00 Delaware
TM Cogeneration Company 100.00 Delaware
Transco Coal Company 100.00 Delaware
Cross Mtn. Coal, Inc. 100.00 Tennessee
Farmer Coal Company, Inc. 100.00 Kentucky
Highland Coal, Inc. 100.00 Kentucky
Interstate Coal Company, Inc. 100.00 Kentucky
Beech Grove Processing Company 100.00 Tennessee
Bledsoe Coal Leasing Company 100.00 Delaware
Inland Ports, Inc. 100.00 Tennessee
Leeco, Inc. 100.00 Kentucky
Mountain Clay, Inc. 100.00 Kentucky
Randall Fuel Company, Inc. 100.00 Georgia
Stansbury & Company, Inc. 100.00 Delaware
Typo Mining, Inc. 100.00 Delaware
Aceco, Inc. 100.00 Kentucky
Bituminous-Laurel Mining, Inc. 100.00 Kentucky
New Brush Creek Mining, Inc. 100.00 Kentucky
Polls Creek Coal Co., Inc. 100.00 Kentucky
Oswayo Mining, Inc 100.00 Kentucky
Sizemore Trucking, Inc. 100.00 Kentucky
Pro-Land, Inc. 100.00 Kentucky
River Coal Company, Inc. 100.00 Kentucky
Valley View Coal, Inc. 100.00 Tennessee
Transco Coal Gas Company 100.00 Delaware
Transco Energy Investment Company 100.00 Delaware
Transco Exploration Company 100.00 Delaware
Transco Gas Company 100.00 Delaware
Border Gas, Inc. 10.00 Delaware
Liberty Operating Company 100.00 Delaware
NESP Supply Corp. 33.33 Delaware
Texas Gas Investment Co. 100.00 Delaware
Texas Gas Transmission Corporation 100.00 Delaware
Trans-Jeff Chemical Corporation 50.00 Delaware
Transco Blue Ridge Pipeline Company 100.00 Delaware
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Transco Gas Gathering Company 100.00 Delaware
Magnolia Pipeline Corporation 100.00 Alabama
Nuval lntrastate Transmission Company I00.00 Delaware
Transco Brine Services Company 100.00 Delaware
Transco Industrial Pipeline Company 100.00 Delaware
Transco Matagorda Pipeline Company 100.00 Delaware
Transco Offshore Gathering Company 100.00 Delaware
Transco Terminal Company 100.00 Delaware
Transco-Louisiana Intrastate
Pipeline Company 100.00 Delaware
Transco-Texas Intrastate
Pipeline Company 100.00 Delaware
Transco Gas Marketing Company 100.00 Delaware
Transco Energy Marketing Company 100.00 Delaware
Transco Liquids Company 100.00 Delaware
HI-BOL Pipeline Company 100.00 Delaware
Transco Power Trading Co. 100.00 Delaware
TXG Energy Services Company 100.00 Delaware
TXG Gas Marketing Company 100.00 Delaware
TXG Intrastate Pipeline Company 100.00 Delaware
Transco Liberty Pipeline Company 100.00 Delaware
Transco Production Services Company 100.00 Delaware
Transcontinental Gas Pipe Line Corporation 100.00 Delaware
Transeastern Gas Pipeline Company, Inc. 100.00 Delaware
TXG Engineering, Inc. 100.00 Delaware
Transco P-S Company 100.00 Delaware
Transco Resources, Inc. 100.00 Delaware
ForTran Exploration Company 100.00 Delaware
Magnolia Methane Corp. 100.00 Delaware
Transco Transportation Company 100.00 Delaware
Tubexpress, Inc. 50.00 Delaware
Transco Tower Realty, Inc. 100.00 Delaware
TREN-FUELS, Inc. 100.00 Texas
Fleet Star, Inc. 100.00 Delaware
Enfuels Corporation 37.50 Delaware
FST Holdings, Inc. 50.00 Delaware
Fleet Star of Texas, L.C. 50.00 Texas
TRANSTAR Technologies, L.C. 50.00 Texas
Tren-Fuels Services, Inc. 100.00 Colorado