The Limerick Generating Station is a nuclear power plant located next to the Schuylkill River in Limerick Township, Montgomery County, Pennsylvania, approximately 29 miles (47 km) northwest of Center City, Philadelphia. The facility has two General Electric boiling water reactor (BWR) units, cooled by natural draft cooling towers. According to its owner, Constellation Energy, the two units are capable of producing 2,317 megawatts of power, which combined would provide electricity to around 2 million households. Constellation owns and operates this facility following their separation from Exelon Corporation in 2022. With the exception of refueling outages, Limerick Generating Station continuously operates at 100% power. The plant is connected to the grid, and transmits power, via multiple 500kv transmission lines.
Limerick is a black start plant, meaning it does not require grid power for stator excitation. For critical standby power, Limerick depends on eight Fairbanks Morse 38 8-1/8 diesel engine generator sets that each deliver 3000 kilowatts of power and are capable of achieving rated speed within ten seconds of start.
The cooling towers for the Limerick Generating Station can be seen for miles away in parts of Montgomery, Chester, and Berks counties, and can be seen from the top of the tallest buildings in Philadelphia, including the One Liberty Observation Deck at Liberty Place.