Otter Tail Corporation is a publicly traded company headquartered in Fergus Falls, Minnesota. The company consists of three primary subsidiaries: Otter Tail Power Company, which provides electricity to more than 130,000 customers in Minnesota, North Dakota, and South Dakota; manufacturing businesses, including BTD Manufacturing, Inc., a metal fabricator; and plastics businesses, including Otter Tail Corporation?s wholly owned subsidiary, Northern Pipe Products, Inc., a manufacturer of PVC pipe. Otter Tail Corporation was founded in 1907 and is traded on NASDAQ under the symbol OTTR.