[3] Formerly, the plant had low-sulfur coal delivered from the Powder River Basin.

[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] 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 (SO2) scrubbers in 2010 and the replacement of cyclones in 2011.

[10] The scrubber installations were to comply with the State of Illinois' Multi-Pollutant Standards (MPS) set in 2006.