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348.9 MW Natural Gas operating in Suffolk, NY
348.9 MW
Nameplate Capacity
2
Generators
units
Natural Gas Fired Combined Cycle
Technology
2009
Operating Since
Coordinates
40.8142, -72.9403
County
Suffolk, NY
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Caithness Long Island, LLC | Caithness Long Island | — |
| Owner(s) | Caithness Long Island, LLC | ArcLight Capital Holdings | — |
| Status | Operating | — | — |
Caithness Long Island Energy Center is a 350 MW natural gas fired power power plant in Yaphank, New York, on Long Island operated by Caithness Energy. It began operation in 2009 as the first major baseload plant to be built on Long Island in over 30 years, and by 2020 produced the second most net energy generated among power plants on Long Island. A proposal to construct a new unit tripling the capacity of the facility received initial approvals in 2013, but did not proceed and was shelved in 2018.
Read more on WikipediaThe Caithness Long Island Energy Center is a 348.9 MW natural gas-fired combined cycle power plant located in Suffolk County, New York. The plant began operating in 2009 and is owned by ArcLight Capital Holdings, with Caithness Long Island, LLC as the operator. It consists of two generators.
The facility operates within the New York Independent System Operator (NYISO) balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region. In the most recent year of data, the plant generated 2,387,956 MWh of electricity, achieving a capacity factor of 78.3%. The plant ranks 22nd out of 38 power plants in New York and 599th out of 945 plants nationally.
Generated from EIA, GEM, and public data sources
ISO/RTO
NYISO
Market
ISO/RTO Member
NERC Region
NPCC — Northeast Power Coordinating Council
Balancing Authority
New York Independent System Operator (NYIS)
Grid Voltage
138.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
231.5K MWh
Latest Month
2.4M MWh
Annual Generation
78.3%
Capacity Factor
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CO₂ Intensity
803 lb/MWh
NOx
0.046 lb/MWh
SO₂
0.004 lb/MWh
CH₄
0.016 lb/MWh
N₂O
0.002 lb/MWh
Capacity Factor
80.6%
Annual Net Gen
2464 GWh
CO₂eq
804 lb/MWh
Subregion
NPCC Long Island
2013
$965/kW
Est. Construction Cost
Total estimated cost: $336.7M
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Point of Interconnection
Nearest Substation
CAITHNESS_CC_1
Substation Distance
< 10 km
Coord Source
NYISO direct
Market Position
ISO/RTO Market
NYISO
LMP Node
323624
Pricing Hub
LONGIL
Node Source
EIA-860 direct report
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-05-31
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