Powering our communities with reliable, affordable electricity Our company is named after the Otter Tail River, which provided our first source of electricity when we became an operating utility in 1909. OTTER TAIL POWER COMPANY otpco.com in Powering our communities with reliable , affordable electricity Our company is named after the Otter Tail River , which provided our first source of electricity when we became an operating utility in 1909 . OTTER TAIL POWER COMPANY otpco.com in