Green-e – Renewable Electricity Certification Program administered by the non-profit Center for Resource Solutions. Its goal is to help consumers find environmentally sensitive energy providers in their areas and ensure that providers are providing the type of energy they claim.
Real Goods – “Products for an Ecologically Sustainable Future” – power production, distribution and storage, appliances, heating, cooling and lighting, more.
Plug Power — Fuel cells for home electricity generation. Based in NY.
ClearSolar — many solar-powered products for the home user.
Renewable Technologies — designs, engineers, installs, and services energy systems including fuel cells, wind turbines, solar, thermal. Based in California.