The plant had two units: Unit 1 began operation in 1965 and Unit 2 began operation in 1972.[2] Initially, coal was delivered via conveyor belt from a nearby coal mine.[3] Formerly, the plant had low-sulfur coal delivered from the Powder River Basin.[4] The plant was cooled by Coffeen Lake which was built to support the power plant in mind.[5] Formerly ran by Central Illinois Public Service Company and later Ameren, Ameren sold the plant to current owner Dynegy in 2013.[3][6] In 2018, Vistra Energy would assume control of Coffeen following its merger with Dynegy.[7] In August 2019, Vistra Energy announced they were shutting down Coffeen by the end of the year in order to meet new revisions under the Multi-Pollutant Standard Rule set by the Illinois Pollution Control Board.[8]
Environmental mitigation
Coffeen replaced its treatment system in 2009 that reduced chemical discharge into the lake by 35%.[9] The plant went through several mid-life updates with the installation of sulfur dioxide (SO 2) scrubbers in 2010 and the replacement of cyclones in 2011.[2]Hitachi's division of Hitachi Power Systems were contracted to manufacture the scrubbers.[10] The scrubber installations were to comply with the State of Illinois' Multi-Pollutant Standards (MPS) set in 2006.[11]