Otter Tail Corp is a U.S. energy company that operates in the electric (produces and sells electricity), manufacturing (fabricates metal components), and plastics segments (pipes for water uses). The company conducts its operations and acquires the majority of its revenue in the U.S. in the states of Minnesota, South Dakota, and North Dakota. The majority of the company's revenue is derived from the Electric segment and commercial customers, although it generates revenue from residential and industrial customers, as well.