Muddy Run
Lancaster County, Pennsylvania · EIA plant ID 3164 · Operator: Exelon Power
Nameplate1,072MWSummer 1,058 MW
Generators8in service
Net generation-521GWh12 mo to Aug 2026
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online1967
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), primary-fuel units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
No capacity factor available.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | -407.6 | — | — |
| 2002 | -456.1 | — | — |
| 2003 | -492.2 | — | — |
| 2004 | -471.4 | — | — |
| 2005 | -464.5 | — | — |
| 2006 | -453.6 | — | — |
| 2007 | -491.6 | — | — |
| 2008 | -88.3 | — | — |
| 2009 | -472.5 | — | — |
| 2010 | -441.7 | — | — |
| 2011 | -359.9 | — | — |
| 2012 | -301.9 | — | — |
| 2013 | -399.8 | — | — |
| 2014 | -403.8 | — | — |
| 2015 | -319 | — | — |
| 2016 | -360.8 | — | — |
| 2017 | -413.5 | — | — |
| 2018 | -421.6 | — | — |
| 2019 | -380.2 | — | — |
| 2020 | -424.4 | — | — |
| 2021 | -521.7 | — | — |
| 2022 | -449.3 | — | — |
| 2023 | -465.7 | — | — |
| 2024 | -442.8 | — | — |
| 2025 | -502.5 | — | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Hydroelectric Pumped Storage | PS | 134 | 134 | Apr 1967 | Operating | — | coming soon |
| 2 | Hydroelectric Pumped Storage | PS | 134 | 131.7 | Apr 1967 | Operating | — | coming soon |
| 3 | Hydroelectric Pumped Storage | PS | 134 | 134 | Apr 1967 | Operating | — | coming soon |
| 4 | Hydroelectric Pumped Storage | PS | 134 | 134 | Jun 1967 | Operating | — | coming soon |
| 5 | Hydroelectric Pumped Storage | PS | 134 | 128.6 | Oct 1967 | Operating | — | coming soon |
| 6 | Hydroelectric Pumped Storage | PS | 134 | 127.7 | Oct 1967 | Operating | — | coming soon |
| 7 | Hydroelectric Pumped Storage | PS | 134 | 134 | Feb 1968 | Operating | — | coming soon |
| 8 | Hydroelectric Pumped Storage | PS | 134 | 134 | Feb 1968 | Operating | — | coming soon |
Owner / operator
Operator: Exelon Power. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Exelon Power | 100.0% | 1,072 MW |
Nearby plants
Within 80 km.
| PPL Holtwood | 247 MW | 3.5 km |
| Peach Bottom | 2,876 MW | 6 km |
| York Energy Center | 1,449 MW | 7.8 km |
| Keystone Solar | 5 MW | 8.9 km |
| Safe Harbor | 418 MW | 15.1 km |
| Wildcat Point Generation Facility | 1,114 MW | 15.3 km |