Muddy Run
Pumped storage power plant in Lancaster County, Pennsylvania. 1,072 MW of nameplate capacity across 8 generators, operated by Constellation Power, Inc.
Also known as Muddy Run Pumped Storage Facility · EIA plant 3164
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 1,072 MWNameplate
- Generators
- 8 operatingEIA-860M, August 2026
- Operating since
- April 1967First generator online
- Operator
- Constellation Power, IncEIA operator ID 6035
- Grid
- PJMBalancing authority PJM
- Price nodes
- 8 PJM nodesResource nodes with prices
- Location
- Lancaster County, PA39.8076, −76.2993
- EIA plant ID
- 3164EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Muddy Run produces
Free · EIA-923Net generation, 2025
−502 GWh
−502,492 MWh, final
Capacity factor, 2025
Not reported
2024: Not reported
January to July 2026
−302 GWh
Provisional
Range, 2015 to 2025
−521.7–−319.0
GWh a year. Low 2021, high 2015
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | −410,596 | Not reported | 12 of 12 |
| 2001 | −407,614 | Not reported | 12 of 12 |
| 2002 | −456,119 | Not reported | 12 of 12 |
| 2003 | −492,233 | Not reported | 12 of 12 |
| 2004 | −471,393 | Not reported | 12 of 12 |
| 2005 | −464,490 | Not reported | 12 of 12 |
| 2006 | −453,601 | Not reported | 12 of 12 |
| 2007 | −491,642 | Not reported | 12 of 12 |
| 2008 | −88,328 | Not reported | 12 of 12 |
| 2009 | −472,545 | Not reported | 12 of 12 |
| 2010 | −441,704 | Not reported | 12 of 12 |
| 2011 | −359,943 | Not reported | 12 of 12 |
| 2012 | −301,896 | Not reported | 12 of 12 |
| 2013 | −399,794 | Not reported | 12 of 12 |
| 2014 | −403,841 | Not reported | 12 of 12 |
| 2015 | −319,003 | Not reported | 12 of 12 |
| 2016 | −360,845 | Not reported | 12 of 12 |
| 2017 | −413,465 | Not reported | 12 of 12 |
| 2018 | −421,640 | Not reported | 12 of 12 |
| 2019 | −380,204 | Not reported | 12 of 12 |
| 2020 | −424,373 | Not reported | 12 of 12 |
| 2021 | −521,656 | Not reported | 12 of 12 |
| 2022 | −449,324 | Not reported | 12 of 12 |
| 2023 | −465,686 | Not reported | 12 of 12 |
| 2024 | −442,788 | Not reported | 12 of 12 |
| 2025 | −502,492 | Not reported | 12 of 12 |
| 2026 (provisional, partial year) | −302,204 | Not reported | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · PJMEmissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Hydroelectric Pumped Storage | 134.0 | April 1967 |
| 2 | Hydroelectric Pumped Storage | 134.0 | April 1967 |
| 3 | Hydroelectric Pumped Storage | 134.0 | April 1967 |
| 4 | Hydroelectric Pumped Storage | 134.0 | June 1967 |
| 5 | Hydroelectric Pumped Storage | 134.0 | October 1967 |
| 6 | Hydroelectric Pumped Storage | 134.0 | October 1967 |
| 7 | Hydroelectric Pumped Storage | 134.0 | February 1968 |
| 8 | Hydroelectric Pumped Storage | 134.0 | February 1968 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Constellation Power, Inc as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Muddy Run
More plants operated by Constellation Power, Inc
Questions about Muddy Run
How much power does Muddy Run produce?
Muddy Run reported −502,492 MWh (−502 GWh) of net generation in 2025. From January to July 2026 it reported −302 GWh, which is provisional.
Where is Muddy Run?
Muddy Run is in Lancaster County, Pennsylvania, at 39.8076, −76.2993. It is in the PJM Interconnection, LLC balancing area (PJM).
Who operates Muddy Run?
EIA-860M for August 2026 lists Constellation Power, Inc as the operator (EIA operator ID 6035). The operator is not always the owner.
When did Muddy Run start operating?
Its first generator began operating in April 1967, according to EIA-860M.
Does InfraMap have power prices for Muddy Run?
Yes. InfraMap has PJM day-ahead and real-time prices at 8 price nodes linked to Muddy Run, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- PJM day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page