Otter Tail Corporation is a holding company. The Company operates through three segments: Electric, Manufacturing and Plastics. The Electric segment includes the production, transmission, distribution and sale of electric energy in Minnesota, North Dakota and South Dakota by Otter Tail Power Company (OTP). The Manufacturing segment consists of businesses in manufacturing activities, such as contract machining, metal parts stamping, fabrication and painting, and production of material and handling trays and horticultural containers. These businesses have manufacturing facilities in Georgia, Illinois and Minnesota and sell products primarily in the United States. The Plastics segment consists of businesses producing polyvinyl chloride (PVC) pipe at plants in North Dakota and Arizona. The PVC pipe is sold primarily in the upper Midwest and Southwest regions of the United States. The Company's manufacturing and plastic pipe businesses are owned by its subsidiary, Varistar Corporation.