The construction for Oklaunion began in 1982 and was commissioned by West Texas Utilities, a forerunner of AEP.[2] The plant commenced commercial generation in December 1986.[3] Initially, the coal was transported from the Rawhide Mine in Wyoming.[4] In 2017, the plant received 719,467 short tons of coal from the North Antelope Rochelle Mine by train according to the Energy Information Administration (EIA).[5] The plant's cooling source came from Lake Diversion, located in Archer and Baylor County, Texas.[6]
In September 2018, AEP announced it was shutting down Oklaunion by September 2020, citing production costs and being no longer competitive in the power market.[7][8] The plant was bought by Frontier Energy, which planned to convert it to natural gas over five years.[9]