Associated Electric Cooperative is owned by and provides wholesale power to six regional generation and transmission cooperatives, which in turn supply wholesale power to 39 distribution cooperatives throughout Missouri, three in southeast Iowa and nine in northeast Oklahoma. Together the cooperatives serve more than 800,000 customers. Associated Electric operates two coal-based power plants and distributes portions of two other cooperatives coal-based power plants. It also maintains several natural gas-based generation projects, as well as oil-based and hydroelectric projects. Associated Electric maintains its headquarters in Springfield, Mo.