- Environmental Power Corporation
 - Primarily engaged in the ownership and operation of electric generating facilities fueled by waste coal. - Green Mountain Energy
- Retail supplier of electricity in states with deregulated electric service. Energy sources include renewable resources such as solar energy, hydro power, and wind.
- Green Power Network
- Information on electric power industry green marketing efforts.
- Green-e Renewable Electricity Program
- Offers information on renewable electricity options when looking for an electricity service provider.
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