Otter Tail Corporation is an energy company based in Fergus Falls Minnesota. Its main subsidiary is the Otter Tail Power Company. As of 2007 Otter Tail Power Company serves at least 423 towns at retail and delivers power to about 14 municipal utilities. The company currently has a workforce of over 750 employees a generating capacity of 660 megawatts and owns over 5 000 miles (8 000 km) of electrical power transmission lines (the majority of which are operated at 41.6kV).