Otter Tail Power Company, Inc. produces and supplies electricity from coal, wind, and water. It offers electricity and energy services to families, communities, schools, or businesses in Minnesota, North Dakota, and South Dakota. The company also engages in the installation, power supplying, and maintenance of electric water heating units, thermal storage systems, radiant heat systems, heat pumps, electric plenum heaters, electric boilers, air conditioning units, and other heating options. In addition, it provides various services, including financing and loan provisions, and workshops and certification training. The company was incorporated in 1907 and is based in Fergus Falls, Minnesota with coal power plants in Milbank, South Dakota; Beulah, North Dakota; and Fergus Falls, Minnesota. It has wind power plants in North Dakota. Otter Tail Power Company, Inc. operates as a subsidiary of Otter Tail Corporation.