Nine Mile Point Nuclear Station
Oswego County, New York · EIA plant ID 2589 · Operator: Exelon Nuclear
Nameplate1,901MWSummer 1,903 MW
Generators2in service
Net generation15,543GWh12 mo to Aug 2026
Capacity factor93%nuclear units, summer MW
Heat rate—thermal plants only
First online1969
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), nuclear 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 | 13,230 | 86.0% | — |
| 2002 | 13,242.9 | 86.1% | — |
| 2003 | 13,866.5 | 90.2% | — |
| 2004 | 13,601.5 | 88.2% | — |
| 2005 | 14,507.7 | 94.3% | — |
| 2006 | 14,384.3 | 93.3% | — |
| 2007 | 13,964 | 90.5% | — |
| 2008 | 14,387.7 | 92.9% | — |
| 2009 | 14,914.5 | 96.5% | — |
| 2010 | 14,239.1 | 91.7% | — |
| 2011 | 14,155.6 | 91.1% | — |
| 2012 | 13,165.3 | 84.5% | — |
| 2013 | 15,846.3 | 94.0% | — |
| 2014 | 15,239.2 | 89.8% | — |
| 2015 | 15,998.1 | 94.9% | — |
| 2016 | 15,500.4 | 92.2% | — |
| 2017 | 15,992.9 | 95.3% | — |
| 2018 | 15,382.8 | 91.6% | — |
| 2019 | 15,821.4 | 94.4% | — |
| 2020 | 15,640.6 | 100.4% | — |
| 2021 | 16,206.4 | 97.0% | — |
| 2022 | 15,160.8 | 91.4% | — |
| 2023 | 15,506.9 | 93.5% | — |
| 2024 | 15,484.5 | 93.0% | — |
| 2025 | 15,963.6 | 95.8% | — |
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 | Nuclear | ST | 641.8 | 619.7 | Dec 1969 | Operating | — | coming soon |
| 2 | Nuclear | ST | 1,259.3 | 1,283.4 | Jul 1987 | Operating | — | coming soon |
Owner / operator
Operator: Exelon Nuclear. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Constellation Nuclear | 54.3% | 1,033 MW |
| Exelon Nuclear | 33.8% | 642 MW |
| Long Island Power Authority | 11.9% | 227 MW |
Nearby plants
Within 80 km.
| James A Fitzpatrick | 883 MW | 0.1 km |
| Sithe Independence Station | 1,158 MW | 4.4 km |
| SSC Oswego II LLC | 5 MW | 7.5 km |
| Oswego | 5 MW | 7.8 km |
| Summit - Scriba CSG | 5 MW | 8.1 km |
| Indeck Oswego Energy Center | 57 MW | 8.7 km |