Caithness Long Island Energy Center
Suffolk County, New York · EIA plant ID 56234 · Operator: Caithness Long Island, LLC
Nameplate349MWSummer 317 MW
Generators2in service
Net generation2,236GWh12 mo to Aug 2026
Capacity factor80%gas/coal/oil units, summer MW
Heat rate7,347Btu/kWhfossil units, electric fuel, HHV
First online2009Runs as baseload
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) |
|---|---|---|---|
| 2009 | 793.2 | 70.4% | 8,612 |
| 2010 | 2,106.3 | 78.3% | 7,116 |
| 2011 | 2,247.4 | 83.6% | 7,271 |
| 2012 | 2,250.5 | 83.5% | 7,254 |
| 2013 | 2,379.6 | 88.5% | 7,382 |
| 2014 | 2,397.7 | 89.2% | 7,392 |
| 2015 | 2,017.8 | 72.7% | 7,417 |
| 2016 | 2,531.7 | 91.0% | 7,362 |
| 2017 | 2,415.2 | 87.0% | 7,408 |
| 2018 | 2,477.2 | 89.2% | 7,415 |
| 2019 | 2,186.1 | 78.8% | 7,457 |
| 2020 | 2,171.3 | 77.9% | 7,517 |
| 2021 | 2,480.8 | 89.3% | 7,401 |
| 2022 | 2,322.9 | 83.6% | 7,436 |
| 2023 | 2,464.3 | 88.7% | 7,399 |
| 2024 | 1,853.1 | 66.5% | 7,355 |
| 2025 | 2,388 | 85.9% | 7,365 |
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 mo4,703 MMBtu
Last month with liquid burnMay 2026
Switch while operatingYes
Net summer MW on gas175
Net summer MW on oil175
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 |
|---|---|---|---|---|---|---|---|---|
| CT01 | Natural Gas Fired Combined Cycle | CT | 196.2 | 187.7 | Aug 2009 | Operating | — | coming soon |
| ST01 | Natural Gas Fired Combined Cycle | CA | 152.7 | 129.6 | Aug 2009 | Operating | — | coming soon |
Owner / operator
Operator: Caithness Long Island, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Caithness Long Island, LLC | 100.0% | 349 MW |
Nearby plants
Within 80 km.
| NY CDG 009 | — | 1.6 km |
| Brookhaven Landfill Solar Farm 1 | 5 MW | 2.1 km |
| Orbit Bloom Fuel Cell | 6 MW | 2.2 km |
| SWM Fuel Cell | 8 MW | 2.8 km |
| Calabro Airport North Solar Project | 1 MW | 5.6 km |
| Calabro Airport South Solar Project | 1 MW | 7 km |