Otter Tail Corporation, together with its subsidiaries, engages in electric utility, manufacturing, and plastic pipe businesses in the United States. It operates through three segments: Electric, Manufacturing, and Plastics. The Electric segment produces, transmits, distributes, and sells electric energy in Minnesota, North Dakota, and South Dakota; and operates as a participant in the Midcontinent Independent System Operator markets. This segment generates electricity through coal, fuel oil, solar, wind, and natural gas. It serves approximately residential, commercial, and industrial customers. Its Manufacturing segment engages in the contract machining, metal parts stamping, fabrication and painting, production of plastic thermoformed horticultural containers, life science and industrial packaging, and material handling components and extruded raw material stock for the recreational vehicle, lawn and garden, agricultural, construction, and industrial and energy equipment end markets. The Plastics segment manufactures polyvinyl chloride pipes for municipal water, rural water, wastewater, storm drainage and water reclamation system, and other uses for customers in the horticulture, medical and life sciences, industrial, recreation, and electronics industries. This segment markets its products to wholesalers and distributors through independent sales representatives, company salespersons, and customer service representatives. The company was formerly known as Otter Tail Power Company and changed its name to Otter Tail Corporation in 2001. Otter Tail Corporation was incorporated in 1907 and is headquartered in Fergus Falls, Minnesota.

215 South Cascade Street, Fergus Falls, MN, United States, 56538-0496