[2] Units 2 and 4 continued to operate because Duke Energy installed baghouses, greatly reducing the pollution and meeting the current standards set by the EPA.

[3] As of 2006, R. Gallagher was the dirtiest major power station in the US in terms of sulphur dioxide gas emission rate: it discharged 40.38 pounds (18.32 kg) of SO2 for each MWh of electric power produced that year (50,819 tons of SO2 per year in total).

[4] Duke Energy shutdown the plant on June 1, 2021,[5] earlier than the previously scheduled retirement in 2022.

After shutdown Duke Energy will continue the process of closing coal ash basins on site, which could take several years.

On October 20, 2024 the boiler house of the R. Gallagher Generating Station was imploded [8] after being shut down since June 1, 2021, with the twin smoke stacks scheduled to be demolished by 2025.