FuelCell Energy, Inc. is a publicly traded fuel cell company, headquartered in Danbury, Connecticut. It designs, manufactures, operates and services Direct Fuel Cell power plants (a type of molten carbonate fuel cell). The company's fuel cell technology is an alternative to traditional combustion-based power generation, and is complementary to intermittent sources of energy, such as solar and wind turbines. As one of the biggest publicly traded fuel cell manufacturers in the U.S., the company provides clean energy in over 50 locations all over the world. It operates the world’s largest fuel cell park, Gyeonggi Green Energy Fuel cell park, which is located in South Korea. The park consists of 21 power plants providing 59 Megawatt of electricity plus district heating to a number of customers