Otter Tail Corporation, together with its subsidiaries, engages in electric, manufacturing, and plastics businesses in the United States. The company's 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, Inc. markets. This segment generates electricity through coal, wind and hydro, and natural gas and oil sources. As of December 31, 2019, it served approximately 132,578 residential, commercial, industrial, and other customers. Its Manufacturing segment stamps, fabricates, welds, paints, and laser cuts metal components for use in the recreational vehicle, agricultural, oil and gas, lawn and garden, industrial equipment, health and fitness, and enclosure industries; manufactures and fabricates parts for off-road equipment, mining machinery, oil fields and offshore oil rigs, wind industry components, broadcast antennae, and farm equipment; a