Port Jefferson
Suffolk County, New York · EIA plant ID 2517 · Operator: National Grid Generation LLC
Nameplate498MWSummer 481 MW
Generators5in service
Net generation441GWh12 mo to Aug 2026
Capacity factor10%gas/coal/oil units, summer MW
Heat rate12,028Btu/kWhfossil units, electric fuel, HHV
First online1958Runs as peaking
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), gas/coal/oil 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.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 1,712 | — | — |
| 2002 | 1,646.6 | — | — |
| 2003 | 1,359.9 | 27.7% | 10,805 |
| 2004 | 1,845.2 | 43.8% | 10,156 |
| 2005 | 1,642.5 | 39.2% | 10,429 |
| 2006 | 1,435.2 | 34.5% | 10,951 |
| 2007 | 1,273.7 | 30.2% | 10,840 |
| 2008 | 969.4 | 23.1% | 11,321 |
| 2009 | 607.8 | 14.8% | 11,408 |
| 2010 | 522.4 | 12.2% | 11,440 |
| 2011 | 543.1 | 12.7% | 11,855 |
| 2012 | 553.7 | 12.8% | 11,681 |
| 2013 | 489.9 | 11.5% | 11,590 |
| 2014 | 458.5 | 10.7% | 11,443 |
| 2015 | 513.8 | 12.4% | 11,455 |
| 2016 | 437.6 | 10.5% | 11,923 |
| 2017 | 241.2 | 5.8% | 11,885 |
| 2018 | 383.9 | 9.3% | 11,636 |
| 2019 | 300.4 | 7.1% | 11,913 |
| 2020 | 550 | 13.0% | 11,422 |
| 2021 | 524.3 | 12.4% | 11,571 |
| 2022 | 419.4 | 10.0% | 11,650 |
| 2023 | 355.5 | 8.4% | 12,137 |
| 2024 | 327 | 7.8% | 12,103 |
| 2025 | 337.7 | 8.0% | 12,068 |
Fuel capability
Gas-fired turbines (CT/GT/CA/CS) that can also burn liquid fuel. EIA-860 Schedule 3 for capability, EIA-923 for actual burn.
StatusLikely still dual fuel
Liquid fuel burned · 36 mo82,742 MMBtu
Last month with liquid burnJul 2026
Switch while operatingNo
Net summer MW on gas83
Net summer MW on oil83
Time gas → oilup to 6 h (EIA 6H)
Time oil → gasup to 6 h (EIA 6H)
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 |
|---|---|---|---|---|---|---|---|---|
| 3 | Natural Gas Steam Turbine | ST | 188 | 192 | Nov 1958 | Operating | — | coming soon |
| 4 | Natural Gas Steam Turbine | ST | 188 | 193 | Nov 1960 | Operating | — | coming soon |
| GT1 | Petroleum Liquids | GT | 16 | 12.9 | Dec 1966 | Operating | — | coming soon |
| GT2 | Natural Gas Fired Combustion Turbine | GT | 53 | 42.6 | Jul 2002 | Operating | — | coming soon |
| GT3 | Natural Gas Fired Combustion Turbine | GT | 53 | 40.1 | Jul 2002 | Operating | — | coming soon |
| 2 | Petroleum Liquids | ST | 46 | 42.2 | Oct 1950 | Retired Sep 1997 | — | coming soon |
| ST1 | Petroleum Liquids | ST | 46 | 42.2 | Dec 1948 | Retired Sep 1997 | — | coming soon |
Owner / operator
Operator: National Grid Generation LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| National Grid Generation LLC | 100.0% | 498 MW |
Nearby plants
Within 80 km.
| Stony Brook Cogen Plant | 47 MW | 5.6 km |
| Holtsville | 567 MW | 14.8 km |
| Richard M Flynn | 170 MW | 14.9 km |
| Shoreham Solar Commons | 25 MW | 16 km |
| Wading River | 239 MW | 16.9 km |
| Kings Park Solar II | 2 MW | 17 km |