| | Allegheny Power System - Provides electricity to customers in Maryland, Ohio, Pennsylvania, Virginia, and West Virginia. |
| | American Electric Power - Provides electricity to customers in Indiana, Kentucky, Michigan, Ohio, Tennessee, Virginia, and West Virginia. |
| | Atmos Energy - Natural gas utility serving customers in 12 states, mostly in the Southeast. |
| | ECONnergy Energy Co., Inc - Suppliers of deregulated energy. Natural gas and electricity. Programs throughout NY, NJ and PA. |
| | El Paso Electric Company - Provides electricity to customers in West Texas and Southern New Mexico. |
| | Empire District Electric Co. - Provides electricity to southwestern Missouri and parts of Arkansas, Kansas, and Oklahoma. |
| | ICAP Energy - An over-the-counter broker of natural gas, electricity and coal. Includes links and information about industry transportation, production and generation, financial markets, weather forecasting and hedging. |
| | Idaho Power - Provides electricity to Idaho, Oregon, and Nevada. |
| | Kansas City Power & Light - Provides electricity to customers in western Missouri and eastern Kansas. |
| | NUI Corp. - Natural gas utility servicing customers in New Jersey, Florida, North Carolina, Pennsylvania, and Maryland. |
| | Old Dominion Electric Cooperative - A power supply cooperative that supplies power to 14 locally owned electric cooperatives in Virginia, Maryland and Delaware. |
| | Xcel Energy - Utility supplier of electric power and natural gas service in Colorado, Kansas, Michigan, Minnesota, New Mexico, North Dakota, Oklahoma, South Dakota, Texas and Wisconsin. |