Otter Tail Corporation engages in electric and nonelectric operations primarily in the United States, Canada, and Mexico. It operates in four segments: Electric, Manufacturing, Construction, and Plastics. The Electric segment engages in the production, transmission, distribution, and sale of electric energy in Minnesota, North Dakota, and South Dakota. This segment serves approximately 129,000 customers. It is also a wholesale participant in the Midwest Independent Transmission System Operator markets, as well as provides technical and engineering services primarily in North Dakota and Minnesota. The Manufacturing segment provides metal components primarily for the recreational vehicle, agricultural, lawn and garden, industrial equipment, health and fitness, and enclosure industries; and parts for off-road equipment, mining machinery, oil fields and offshore oil rigs, wind industry components, broadcast antennae, and farm equipment for equipment manufacturers. It also manufactures and sells thermoformed products for the horticulture industry, as well as produces products, such as clamshell packing, blister packs, returnable pallets, and handling trays for shipping and storing odd-shaped or difficult-to-handle parts for other industries. The Construction segment provides mechanical and prime contracting services for water and wastewater treatment plants, power generation plants, hospital and pharmaceutical facilities, and other industrial and manufacturing projects; and electrical design and construction services for the industrial, commercial, and municipal business markets. The Plastics segment manufactures and sells polyvinyl chloride pipes for municipal water, rural water, wastewater, storm drainage systems, and other uses. The company was formerly known as Otter Tail Power Company and changed its name to Otter Tail Corporation in 2001. Otter Tail Corporation was founded in 1907 and is headquartered in Fergus Falls, Minnesota.