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Hydroelectric stations for reliable power generation

Exelon Generation owns and operates two hydroelectric power plants - one run-of-the-river and one pumped storage - along the Susquehanna River in Maryland and Pennsylvania.

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.  

Hydroelectric Investment

Exelon Generation's two hydroelectric power plants can provide nearly 1,600 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.
Environmental Commitment

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.

Relicensing Efforts

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.  

Exelon-Operated Hydroelectric Plants
Conowingo Hydroelectric Generating Station

Conowingo Hydroelectric Generating Station

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

Muddy Run Pumped Storage Facility

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

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. PDFPDFs require software like the Adobe Acrobat Reader to be viewed properly.

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