Conowingo Hydroelectric Generating Station and Muddy Run Pumped Storage Facility provide more than 1,600 megawatts (MW) of low-carbon power generation, as well as much needed load-leveling and baseload (24/7) power. Exelon Generation has nearly 300 MW of additional hydro capacity from the company's ownership interest in Safe Harbor (277.7 MW) in Pennsylvania and Malacha (16 MW) in California.
Exelon Generation's four hydroelectric power plants consist of 24 units that provide nearly 2,000 MW of reliable, environmentally friendly power generation that complements the company’s fossil, renewable and nuclear portfolios.
- Conowingo Hydroelectric Generating Station is a run-of-the-river power plant in Darlington, Maryland that uses water flow from the Susquehanna River to generate 572 MW of power. Since 2001, Exelon has invested in upgrades to the power plant which have increased total generation capacity by 58 MW.
- Muddy Run Pumped Storage Facility pumps water into a reservoir during off-peak hours and uses that water to generate electricity during peak demand hours. The facility produces over 1,000 MW.
- Exelon has a 67 percent (277.7 MW) ownership interest in Safe Harbor, which is a run-of-the-river hydroelectric facility located on the Susquehanna River in Conestoga, Pennsylvania. Exelon also has a 50 percent (16 MW) ownership interest in Malacha, a pumped storage hydroelectric facility located in McArthur, California.
The installation of fish lifts at the Conowingo Dam has helped restore the American shad population over the past 30 years. Exelon’s stewardship of 9,000 acres of land along the lower Susquehanna River offers public recreation and nature conservancy in the region, including a $4.5 million investment in a new fishing wharf at Conowingo that is handicapped accessible.
Learn more about Exelon’s environmental and business strategy, Exelon 2020.
Both Conowingo and Muddy Run currently hold licenses issued by the Federal Energy Regulatory Commission (FERC) that expire in 2014. Exelon wishes to preserve this virtually emissions-free generating capacity and its electrical output, while enhancing both environmental integrity and local community relationships. In August 2012, Exelon filed applications to relicense both Muddy Run and Conowingo with FERC. Typically, a FERC license is issued for a period from 30 to 50 years.
Safety and Performance
All Exelon facilities employ sophisticated emergency response plans to protect public health and safety. These plans are reviewed and approved by state governments and regulatory agencies. The emergency planning includes coordination with local counties, municipalities and school districts.
Exelon Generation continues to monitor and modify the security arrangements for its hydroelectric facilities.
Giving back. Our power plants aim to be good neighbors within their local communities with active involvement through sponsorships, charitable giving and volunteering focusing on the environment, education, the arts and diversity. We encourage our employees to give back to their communities and we recognize their efforts through various programs.
Hydroelectric Power Plants
Exelon Power is headquartered in Kennett Square, Pennsylvania. A business unit of Exelon Generation, Exelon Power is responsible for the company's fleet of fossil, renewable and hydroelectric generating assets. Exelon Power fully owns and operates Muddy Run Pumped Storage Facility and Conowingo Hydroelectric Generating Station. The company also has ownership interest in two additional hydro power facilities in California and Pennsylvania.
- Exelon-Operated Hydroelectric Plants
Conowingo Hydroelectric Generating Station is a run-of-the-river power plant located on the Susquehanna River in northern Maryland. Conowingo has been providing electric power to the region since 1928. Water flow of the Susquehanna River provides fuel to turn 11 turbine generators.
2569 Shures Landing Road
Darlington, Maryland 21034
Muddy Run Pumped Storage Facility generates electricity for peak demand, which is typically during the morning and early evening hours. At night, as electricity demand decreases, the units are reversed and used as pumps to fill the upper reservoir for subsequent peak demand periods.
172 Bethesda Church Rd West
Holtwood, Pennsylvania 17532
- Ownership Interest Hydroelectric Plants
Malacha is a pumped storage hydroelectric facility located in McArthur, California. Exelon has a 50 percent (16 MW) ownership interest in the station. The station’s full capacity is 32 MW. Power generated at Malacha is sold to Pacific Gas & Electric and serves most of the northern two thirds of California.
182 Pine Meadow Drive
McArthur, California 96056
Safe Harbor is a run-of-the-river hydroelectric facility located on the Susquehanna River in Conestoga, Pennsylvania. Exelon has a 67 percent (277.7 MW) ownership interest in the station. The station’s full capacity is 416 MW.
1 Powerhouse Road
Conestoga, Pennsylvania 17516
Exelon Power Fact Sheet [PDF | 94 KB]Exelon Power is the business unit within Exelon Generation Company, LLC that is responsible for managing, operating, and maintaining the company’s fossil (coal, oil, and natural gas), landfill gas, hydro, wind and solar-powered fleet of generating assets.