We're an investor-owned electric utility that provides electricity and energy services for approximately 133,000 residential, commercial, and industrial customers across 70,000 square miles in Minnesota, North Dakota, and South Dakota. Our company is named after the Otter Tail River, which provided our first source of electricity when we became an operating utility in 1909. A subsidiary of Otter Tail Corporation, we’re headquartered in Fergus Falls, Minnesota.