Engines, microturbines and fuel cells generate electric power for individual customers and often utilize waste heat to provide some of the customer's heating, water heating and, in some cases, air conditioning needs.
Federal energy policy now includes emphasis on increasing electric generation from renewable resources. These usually include bioenergy, hydrogen, ocean, wind, solar, geothermal and hydropower resources.
Lighting can consume up to 35 percent of a building’s electricity. While energy conservation was important before September 11, it has become even more significant with the possible difficulties in obtaining foreign oil.