[citation needed] The power plant includes a four-lane tunnel for State Route 7, constructed in 1982 at a cost of $27 million.

[9] Due to low wholesale power prices in 2012 exacerbated by the supply of natural gas, FirstEnergy temporarily idled Sammis.

[10] FirstEnergy announced in July 2016 that it would retire its four oldest units of Sammis in 2020 due to increasing costs and market forces.

FirstEnergy Solutions blamed the wholesale market system, which PJM Interconnection operates on, for not relying on coal and nuclear plants.

[14] However, the bill itself was a part of a public corruption scheme revealed by the United States Department of Justice (DOJ) in July 2020.

[17] Sammis was subjected to a suit by the Environmental Protection Agency (EPA) for violating the Clean Air Act in 1978.

[18] To resolve the persistent pollution issues raised by the EPA, Ohio Edison constructed a $445 million structure for electrostatic precipitators on top of tunnel over State Route 7.

The plant was retrofitted with selective catalytic reduction (SCR) systems and scrubbers by Babcock & Wilcox to reduce sulfur dioxide (SO2) and nitrogen oxide (NOx) emissions by 95% and 90% respectively.