FuelCell Energy Inc is a fuel-cell power company. FuelCell designs, manufactures, sells, installs, operates, and services fuel-cell products, which efficiently convert chemical energy in fuels into electricity through a series of chemical reactions. The company primarily generates revenue from the sale of fuel-cell power plants, fuel-cell parts, and electricity. Multiyear construction, operation, and maintenance agreements also represent substantial revenue streams. FuelCell Energy's major customers include large-scale power users, such as utility companies, municipalities, and universities, which require on-site power grid support. The company's major geographical markets are South Korea and the United States. Operations from South Korea generate most of FuelCell's revenue.