| Allegheny Power System - Provides electricity to customers in Maryland, Ohio, Pennsylvania, Virginia, and West Virginia.
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| American Electric Power - Provides electricity to customers in Arkansas, Indiana, Kentucky, Louisiana, Michigan, Ohio, Oklahoma, Tennessee, Texas, Virginia, and West Virginia. Customer service, economic development, and bill pay.
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| Atmos Energy - Natural gas utility serving customers in 12 states, mostly in the Southeast. Includes service information, news and FAQs.
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| El Paso Electric Company - Provides electricity to customers in West Texas and Southern New Mexico.
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| Empire District Electric Co. - Provides electricity to southwestern Missouri and parts of Arkansas, Kansas, and Oklahoma.
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| Idaho Power - Provides electricity to Idaho, Oregon, and Nevada.
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| Kansas City Power & Light - Provides electricity to customers in western Missouri and eastern Kansas.
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| NUI Corp. - Natural gas utility servicing customers in New Jersey, Florida, North Carolina, Pennsylvania, and Maryland.
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| Old Dominion Electric Cooperative - A power supply cooperative that supplies power to 14 locally owned electric cooperatives in Virginia, Maryland and Delaware.
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| Xcel Energy - Formed by the merger of Minneapolis-based Northern States Power Co. and Denver-based New Century Energies, Xcel Energy serves 12 states.
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| 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.
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