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1072 MW Hydro operating in Lancaster, PA
1,072 MW
Nameplate Capacity
8
Generators
units
Hydroelectric Pumped Storage
Technology
1967
Operating Since
Coordinates
39.8076, -76.2993
County
Lancaster, PA
Nearby Plants
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Request a demo →Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Constellation Power, Inc | Constellation Energy | — |
| Owner(s) | Constellation Power, Inc | Constellation Energy | — |
| Status | Operating | operating | — |
Muddy Run Pumped Storage Facility is a pumped-storage hydroelectric generation facility in Drumore Township, Pennsylvania, United States. Constructed by the Philadelphia Electric Company and completed in 1968, Muddy Run was the largest pumped-storage facility in the world. Muddy Run has a capacity of 1,071 megawatts. The facility is operated by the Susquehanna Electric Company, a subsidiary of Constellation Energy.
Read more on WikipediaMuddy Run is a 1,072 MW pumped-storage hydroelectric power plant located in Lancaster County, Pennsylvania. The plant began operating in 1967 and is owned and operated by Constellation Energy through its subsidiary, Constellation Power, Inc. It is the largest pumped storage facility in Pennsylvania, ranking 1 out of 4 in the state, and 17 out of 194 nationally. The plant consists of 8 generators utilizing water as its primary fuel source.
Muddy Run operates within the PJM Interconnection, LLC balancing authority and the RFC NERC region. The plant's operations and impact on the energy industry have been noted in various news sources, with 10 articles available, primarily focusing on industry and regulatory matters. A Wikipedia extract is available with further information.
Generated from EIA, GEM, and public data sources
ISO/RTO
PJM
Market
ISO/RTO Member
NERC Region
RFC
Balancing Authority
PJM Interconnection, LLC (PJM)
Grid Voltage
220.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
−44.6K MWh
Net Charging
-502.5K MWh
Annual Net Energy
-5.3%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
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$2,294/kW
Est. Construction Cost
Total estimated cost: $2.5B
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Nearest Substation
Face Rock Substation · 115 kV
Substation Distance
< 10 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
PJM
LMP Node
MUDDYRN 13 KV UNIT1
Pricing Hub
WESTERN HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
Last updated 2026-04-09
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