Voluntary program has enlisted companies, cities, universities and others with the aim of boosting the market for renewable energy. The [U.S.] Environmental Protection Agency (EPA) recently launched the Green Power Partnership, a voluntary program to increase the use of energy generated from renewable sources. Fortune 500 companies such as 3M, Ford, General Motors and office furniture manufacturer Steelcase have signed on as founding partners, along with several cities, universities and federal government offices.