- American DG Energy
 - Finances, installs, owns, operates, and maintains co-generation and cooling systems. Equipment sales, turn-key installations, and 100% outsourced solutions. - 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-e Renewable Electricity Program
- Offers information on renewable electricity options when looking for an electricity service provider.
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