Caithness Long Island Energy Center
Natural gas power plant in Suffolk County, New York. 348.9 MW of nameplate capacity across 2 generators, operated by Caithness Long Island, LLC.
Also known as EIA plant 56234
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Key facts
- Capacity
- 348.9 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- August 2009First generator online
- Operator
- Caithness Long Island, LLCEIA operator ID 49950
- Grid
- NYISOBalancing authority NYIS
- Price nodes
- 1 NYISO nodeResource nodes with prices
- Location
- Suffolk County, NY40.8142, −72.9403
- EIA plant ID
- 56234EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Caithness Long Island produces
Free · EIA-923Net generation, 2025
2.39 TWh
2,387,956 MWh, final
Capacity factor, 2025
78.1%
2024: 60.5%
January to July 2026
1.33 TWh
Provisional
Range, 2015 to 2025
1.9–2.5
TWh a year. Low 2024, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | 793,220 | Not reported | 6 of 12 |
| 2010 | 2,106,294 | 68.9% | 12 of 12 |
| 2011 | 2,247,417 | 73.5% | 12 of 12 |
| 2012 | 2,250,535 | 73.4% | 12 of 12 |
| 2013 | 2,379,615 | Not reported | 12 of 12 |
| 2014 | 2,397,688 | 78.4% | 12 of 12 |
| 2015 | 2,017,827 | Not reported | 12 of 12 |
| 2016 | 2,531,727 | 82.6% | 12 of 12 |
| 2017 | 2,415,158 | 79.0% | 12 of 12 |
| 2018 | 2,477,229 | 81.1% | 12 of 12 |
| 2019 | 2,186,105 | 71.5% | 12 of 12 |
| 2020 | 2,171,338 | 70.8% | 12 of 12 |
| 2021 | 2,480,766 | 81.2% | 12 of 12 |
| 2022 | 2,322,870 | 76.0% | 12 of 12 |
| 2023 | 2,464,329 | 80.6% | 12 of 12 |
| 2024 | 1,853,121 | 60.5% | 12 of 12 |
| 2025 | 2,387,956 | 78.1% | 12 of 12 |
| 2026 (provisional, partial year) | 1,333,763 | 75.1% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · NYISOEmissions
Free · EPA CAMPDCO₂, 2025
954,833
US short tons. 2024: 744,993
SO₂, 2025
5
US short tons
NOx, 2025
55
US short tons
CO₂ per MWh, calculated
0.40 t
About 800 lb per MWh
1 of 1 EPA units reported CO₂ in 2025 (1), matched to EIA plant 56234 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
Not reported
million gallons as reported; not used, see note
Consumption, 2024
Not reported
million gallons
Source
Municipal
Other. Dry cooling
Watershed stress
Very low/none · 0.110
USGS SUI, HUC12 Swan River-Great South Bay
0 of 12 cooling months report withdrawal. Dry cooling with no reported withdrawal; not tested. Consumption is below 5% of a large reported withdrawal, so the withdrawal is not used. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| CT01 | Natural Gas Fired Combined Cycle | 196.2 | August 2009 |
| ST01 | Natural Gas Fired Combined Cycle | 152.7 | August 2009 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Caithness Long Island, LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near Caithness Long Island
Questions about Caithness Long Island
How much power does Caithness Long Island Energy Center produce?
Caithness Long Island Energy Center reported 2,387,956 MWh (2.39 TWh) of net generation in 2025, a 78.1% capacity factor on 348.9 MW of nameplate capacity. From January to July 2026 it reported 1.33 TWh, which is provisional.
Where is Caithness Long Island Energy Center?
Caithness Long Island Energy Center is in Suffolk County, New York, at 40.8142, −72.9403. It is in the New York Independent System Operator balancing area (NYIS).
Who operates Caithness Long Island Energy Center?
EIA-860M for August 2026 lists Caithness Long Island, LLC as the operator (EIA operator ID 49950). The operator is not always the owner.
When did Caithness Long Island Energy Center start operating?
Its first generator began operating in August 2009, according to EIA-860M.
Does InfraMap have power prices for Caithness Long Island Energy Center?
Yes. InfraMap has NYISO day-ahead and real-time prices at 1 price node linked to Caithness Long Island Energy Center, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- NYISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page