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| AEP ENERGY SERVICES, INC |
| AMERICAN CENTRAL GAS COMPANIES, INC. |
| ASSOCIATED ELECTRIC COOPERATIVE, INC. |
| BLACK HILLS ENERGY RESOURCES INC |
| BP ENERGY COMPANY |
| CARGILL,INC. |
| COWBOY PIPELINE SERVICE COMPANY |
| DELMARVA POWER & LIGHT COMPANY |
| DOMINION EXPLORATION & PRODUCTION, INC. |
| E PRIME INC |
| ENDEVCO OIL AND GAS COMPANY |
| ENERCORP GAS TRANSMISSION SYSTEM, INC. |
| ENERGYUSA-TPC CORP |
| FERRELL RESOURCES, L.L.C. |
| FLT ENERGY SERVICES, LLC |
| H & N GAS LTD |
| J. MAKOWSKI ASSOCIATES, INC |
| KCS ENERGY MARKETING, INC. |
| LUMINANT ENERGY COMPANY LLC |
| MOBIL NATURAL GAS INC. |
| MUNICH RE TRADING LLC |
| NJR ENERGY SERVICES COMPANY |
| NOBLE ENERGY, INC. |
| ORANGE AND ROCKLAND UTILITIES, INC. |
| PEPCO ENERGY SERVICES, INC. |
| STATOIL NORTH AMERICA INC |
| TENASKA GAS STORAGE,LLC |
| THE NARRAGANSETT ELECTRIC COMPANY D/B/A NATIONAL GRID |
| YUMA GAS CORPORATION |