Seneca Generation LLC
Warren County, Pennsylvania · EIA plant ID 8225 · Operator: Seneca Generation LLC
Nameplate438MWSummer 463 MW
Generators3in service
Net generation-332GWh12 mo to Aug 2026
Capacity factor31%hydro units, summer MW
Heat rate—thermal plants only
First online1970
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), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
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 | -207.8 | — | — |
| 2002 | -201.6 | — | — |
| 2003 | -246.8 | — | — |
| 2004 | -214.5 | — | — |
| 2005 | -246.6 | — | — |
| 2006 | -244.6 | — | — |
| 2007 | -231.2 | — | — |
| 2008 | -265.4 | — | — |
| 2009 | -258 | — | — |
| 2010 | -266.1 | — | — |
| 2011 | -133.8 | — | — |
| 2012 | -141.5 | — | — |
| 2013 | -139 | — | — |
| 2014 | -174.8 | — | — |
| 2015 | -189.9 | — | — |
| 2016 | -201 | — | — |
| 2017 | -191.8 | — | — |
| 2018 | -237.5 | — | — |
| 2019 | -185.4 | — | — |
| 2020 | -169.9 | — | — |
| 2021 | -169.9 | 0.0% | — |
| 2022 | -292.5 | 0.0% | — |
| 2023 | -346.1 | 35.5% | — |
| 2024 | -374 | 35.0% | — |
| 2025 | -353.3 | 33.7% | — |
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 | 205.9 | 225.4 | Jun 1970 | Operating | — | coming soon |
| 2 | Hydroelectric Pumped Storage | PS | 205.9 | 208.1 | Jun 1970 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 26.1 | 29.9 | Jun 1970 | Operating | — | coming soon |
Owner / operator
Operator: Seneca Generation LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Seneca Generation LLC | 100.0% | 438 MW |
Nearby plants
Within 80 km.
| Warren | 53 MW | 15.2 km |
| York Run Solar | — | 26.4 km |
| Wetmore - PA 0187 (Chittester) | — | 29.6 km |
| SL JAMESTOWN ARRAY 1 | 3 MW | 32.6 km |
| SL JAMESTOWN ARRAY 2 | 5 MW | 32.7 km |
| S A Carlson | 96 MW | 34.7 km |