Fuel cells exploit this chemical reaction, pulling oxygen from the air and hydrogen from a fuel source such as natural gas. Microgrids Software-synchronized networks of micropower generators. Microturbines Small-scale turbines that generate electricity by spinning a magnet inside a coil at extremely high speeds. Fueled by a variety of gases. Photovoltaics Also known as solar cells, photovoltaics convert sunlight to electricity.
Costs are high but the fuel is free, and maintenance costs are low.
Reciprocating engines Refined versions of internal combustion engines provide more efficient output and lower emissions. Currently lower cost, but higher emissions and higher maintenance needs than other emerging micropower technologies. See January 2001 fedgazette .