A

1. Alagasco - Alabama Gas Company.
2. ANR Pipeline Company
3. Aquila Gas Pipeline
4. Atlanta Gas Light 
5. Atlanta Gas Light Company
6. Atmos Energy Corporation - natural gas service in Texas, Louisiana, Kentucky, Colorado, Kansas, and Missouri.
7. Avista Corporation

B

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1. Baltimore Gas and Electric
2. Bay State Gas Company - New England natural gas distribution.
3. Berkshire Gas Company - Massachusetts.
4. Black Mountain Gas
5. Boston Gas Company - New England's largest distributor.
6. Brooklyn Union - natural gas.

C

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1. Central Hudson Gas & Electric Corporation - New York.
2. Chesapeake Utilities Corporation - Maryland.
3. Cinergy
4. Citizens Gas Company
5. Citizens Gas & Coke - Indiana.
6. Citizens Utilities
7. CMS Energy
8. Colonial Gas - Massachusetts.
9. Columbia Gas of Ohio
10. Columbia Gas of Pennsylvania and Maryland
11. Columbia Gas of Virginia
12. Commonwealth Gas Company - Massachusetts.
13. COM/Gas - Massachusetts.
14. Connecticut Energy Corporation - holding company.
15. Con Edison - Consolidated Edison, New York.
16. Consolidated Natural Gas
17. Consumers Energy Company
18. Corning Natural Gas Corporation
19. CTG Resources

D

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1. Dayton Power & Light Co.
2. Delmarva Power & Light
3. Delta Natural Gas Company, Inc. - Kentucky.
4. Dominion Gas
5. Dominion Resources
6. Duke Energy

E

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1. East Ohio Gas
2. Eastern Enterprises
3. The Eastern Group
4. eCORP - (formerly Natural Gas Storage Corporation)
5. El Paso Energy Corporation - (formerly El Paso Natural Gas Company)
6. Empire Natural Gas
7. Energen Corporation
8. Energy East Corporation
9. Energy West 
10. Energy West - Natural gas service in Montana & Arizona.
11. EnergyNorth, Inc. - New Hampshire's largest natural gas and propane distribution company.
12. Enova
13. Equitable Resources
14. Essex County Gas Company - MA.

F

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1. Fairbanks Natural Gas
2. Fall River Gas Company - Massachusetts.
3. Fidelity Natural Gas - Missouri.

G

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1. Georgia Natural Gas
2. Great Lakes Gas Transmission
3. Great Plains Natural Gas
4. Greeley Gas Company

H

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1. Honesdale Gas Company
2. Houston Industries

I

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1. IES Industries [Alliant]
2. Illinova Corporation
3. Indiana Energy
4. Indiana Gas Company

K

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1. Kansas Gas Service
2. Keyspan Energy
3. Kinder Morgan, Inc
4. Kokomo Gas and Fuel Company

L

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1. Laclede Gas Company
2. LG&E Energy Kentucky.

M

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1. Madison Gas and Electric - Wisconsin.
2. MaineEnergy.com
3. MCN Energy Group - Michigan.
4. MDU Resources Group
5. michcon
6. Michigan Consolidated Gas Company
7. MidAmerican Energy - Iowa.
8. Minnegasco
9. Mobile Gas - Alabama.
10. Montana Power Company
11. Montana-Dakota Utilities Co.

N

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1. Nashville Gas - Tennessee.
2. National Fuel Gas Company
3. National Fuel Resources - Diversified energy corporation.
4. Natural Fuels Corporation - Colorado.
5. eCORP [formerly Natural Gas Storage Corporation]
6. New Century Energies (formerly PSC CO & SWPSC)
7. New Jersey Natural Gas Company
8. New York State Electric & Gas
9. Niagara Mohawk - New York.
10. NICOR
11. Nicor Energy
12. NIPSCO
13. NiSource - [holding company]
14. NJ Resources
15. Northeast Ohio Natural Gas Corporation
16. Northern Indiana Fuel & Light
17. Northern Indiana Public Service Company
18. Northern States Power
19. Northern Utilities
20. Northwest Natural Gas
21. NSTAR
22. NUI Corporation - Natural gas service in NY, PA, NJ, MD, NC & FL.
23. NW Natural

O

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1. Ohio Valley Gas Corporation
2. ONEOK Inc. - Oklahoma natural gas production, transmission & distribution.

P

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1. Pacific Enterprises
2. Pacific Gas & Electric
3. PECO Energy - Philadelphia.
4. Peoples Energy Corporation
5. Peoples Gas - [TECO]
6. PG Energy - Pennsylvania.
7. Piedmont Natural Gas Company
8. PNM - New Mexico.
9. Portland General Electric Co.
10. Providence Energy Corporation
11. Providence Gas Company - Rhode Island.
12. Public Service Company of New Mexico
13. Public Service Company of North Carolina, Inc.
14. Public Service Electric and Gas - New Jersey.
15. Public Service Enterprise Group

Q

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1. Questar Corporation

R

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1. Reliant Energy Minnegasco
2. Roanoke Gas Company
3. Rochester Gas & Electric - New York.

S

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1. San Diego Gas & Electric - [Enova]
2. Shoreline Gas
3. Sierra Pacific - Nevada & California.
4. South Carolina Electric & Gas
5. South Jersey Industries, Inc.
6. Southern California Gas Company
7. Southern Connecticut Gas Company
8. Southern Indiana Gas And Electric Company
9. Southern Union Company
10. Southwest Gas
11. Southwestern Energy Company
12. Stand Energy Corporation
13. St. Lawrence Gas - New York

T

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1. TXU Electric & Gas
2. T. W. Phillips - Pennsylvania.

U

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1. UGI Corporation - Pennsylvania gas and electric utility.
2. Union Electic - St. Louis, Missouri.
3. UNITIL - US northeast.
4. UtiliCorp United - Energy One.

V

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1. Valley Resources Inc. - Public utility holding company.
2. Vermont Gas Systems, Inc.  
3. Virginia Gas Company

W

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1. Washington Gas
2. Western Resources - KPL ~ KG&E.
3. WICOR [holding company]
4. The Williams Companies
5. Wisconsin Energy Corporation
6. Wisconsin Fuel & Light Company
7. Wisconsin Gas
8. Wisconsin Public Service Corporation

Y

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1. Yankee Gas - Connecticut.

1. Active Propane
2. AmeriGas
3. Blossman Gas
4. Campora propane service.
5. Corbin Gas
6. Dixie Gas and Oil Corporation
7. Eastern Propane Gas, Inc. - New England.
8. EnergyNorth, Inc. - New Hampshire's largest natural gas and propane distribution company.
9. Energy West
10. EnergyUSA Propane
11. Ferrellgas - propane.
12. Globe Gas Corporation
13. Litter Quality Propane - Ohio.
14. Paraco
15. Phillips Propane
16. Propane Gas Association of Canada
17. Propane Resources
18. propanegas.com
19. Suburban Propane
20. Texas Liquids
21. Thermogas
22. UGI Corporation - Pennsylvania gas and electric utility & propane subsidiary.
23. United Propane
24. Webber Energy Fuels - Maine and New Hampshire home heating oil & propane.