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 of electrical power transmission lines (the majority of which are operated at 41.6 kV). The company serves 128,500 customers in North Dakota, Minnesota, and South Dakota. History The company was incorporated in 1907 when funds were secured to begin construction of the Dayton Hollow Dam southwest of Fergus Falls. Once the dam came online in April 1909, the company transmitted power at 22 kV over a line to serve the customers of the Northern Light Electric Company at Wahpeton, North Dakota. Shortly thereafter, contracts were secured to provide power at wholesale to the cities of Breckenridge and Fergus Falls, MN (the latter after their own municipal utility's dam failed). After connecting Foxhome, MN, to the system in 1912, the company connected or purchased electric distribution systems in 10 Minnesota towns (the most prominent being Elbow Lake and Morris, MN) and a second town in North Dakota (Fairmount) the following year. Northern Light Electric also merged with Otter Tail at this time and its owner came on board as the company's first general manager. The first South Dakota community served by the company was White Rock in 1915. By 1920, the company was serving approximately 44 towns, all but a handful of which were in or near Otter Tail County. However, the company quickly found its Minnesota service area hemmed in by neighboring utility companies that were also rushing to add territory. This led to the company expanding westward into and across much of eastern North Dakota, reaching Jamestown, ND by 1924 (the company was serving over 100 towns by this time). The company grew at an incredible rate over the next 5 years—reaching the Missouri River at Washburn in 1926 and approaching the Canada–US border by 1928. By the end of the 1920s, the company's service area had tripled to serve more than 310 towns. During the Great Depression, the company was apparently not as badly affected as some of its neighbors but was still forced to focus more on survival than growth. By 1939, the worst was