Fernwärme
District heating distributes heat generated in a centralized location for residential and commercial heating requirements. The heat is often obtained from a cogeneration plant burning fossil fuels but increasingly biomass, although heat-only boiler stations, geothermal heating and central solar heating are also used, as well as nuclear power. A system was built in France in the 14th Century and the United States Naval Academy in Annapolis, Maryland began steam district heating service in 1853. However, the first commercially successful district heating system was launched in Lockport, New York, in 1877 by American hydraulic engineer Birdsill Holly, considered the founder of modern district heating.