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E F Barrett

Nassau County, New York · EIA plant ID 2511 · Operator: National Grid Generation LLC
Natural gasNatural Gas Fired Combustion TurbineNatural Gas Steam Turbine⛽ Dual-fuelNYISOBA: NYIS
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Nameplate669MWSummer 654 MW
Generators13in service
Net generation1,087GWh12 mo to Aug 2026
Capacity factor19%gas/coal/oil units, summer MW
Heat rate13,266Btu/kWhfossil units, electric fuel, HHV
First online1956Runs as intermediate

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
050100150200GWh2001200320052007200920112013201520172019202120232025

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.
0%10%20%2005201020152020202519.0% · 12 mo

Heat rate by year

Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
11,00012,00013,0002005201020152020202513,266 Btu/kWh · 12 mo
Annual data table
YearNet GWhCapacity factorHeat rate (Btu/kWh)
20011,712——
20021,789.2——
20031,408.922.9%11,427
20041,334.321.4%11,372
20051,305.521.4%11,439
20061,443.423.9%11,358
20071,427.223.8%11,273
20081,180.319.8%11,682
2009994.116.5%11,796
20101,14919.1%11,626
20111,064.117.9%11,683
20121,146.519.5%11,732
20131,154.519.7%11,798
20141,51926.0%11,305
20151,538.126.3%11,376
20161,615.327.5%11,272
20171,357.623.2%11,362
20181,436.324.5%11,610
20191,423.824.9%11,380
20201,38524.1%11,526
20211,516.826.5%11,455
20221,370.823.9%11,688
20231,427.824.9%11,518
20241,183.520.6%11,615
20251,169.820.4%12,362

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 mo163,582 MMBtu
Last month with liquid burnJun 2026
Switch while operatingYes
Net summer MW on gas281
Net summer MW on oil281
Time gas → oilup to 1 h (EIA 1H)
Time oil → gasup to 1 h (EIA 1H)

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 IDTechnologyPrime moverNameplate MWSummer MWOnlineStatusPlanned retirementOEM / model
10Natural Gas Fired Combustion TurbineGT41.840.6Jun 1971Operating—coming soon
11Natural Gas Fired Combustion TurbineGT41.840.1Jun 1971Operating—coming soon
12Natural Gas Fired Combustion TurbineGT41.840.9Jun 1971Operating—coming soon
3Natural Gas Fired Combustion TurbineGT1817.7Jun 1970Operating—coming soon
4Natural Gas Fired Combustion TurbineGT1816.8Jul 1970Operating—coming soon
5Natural Gas Fired Combustion TurbineGT1817.6Jul 1970Operating—coming soon
6Natural Gas Fired Combustion TurbineGT1816.4Jul 1970Operating—coming soon
8Natural Gas Fired Combustion TurbineGT1815.1Jul 1970Operating—coming soon
9Natural Gas Fired Combustion TurbineGT41.841.2Jun 1971Operating—coming soon
GT1Natural Gas Fired Combustion TurbineGT1817.4Jun 1970Operating—coming soon
GT2Natural Gas Fired Combustion TurbineGT1817.6Jun 1970Operating—coming soon
ST1Natural Gas Steam TurbineST188194.2Nov 1956Operating—coming soon
ST2Natural Gas Steam TurbineST188178Oct 1963Operating—coming soon
7Natural Gas Fired Combustion TurbineGT18—Jul 1970Retired Oct 2011—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 LLC100.0%669 MW

Nearby plants

Within 80 km.
Mount Sinai South Nassau Hospital11 MW4.2 km
Charles P Keller29 MW4.7 km
Plant No 1 Freeport6 MW6.4 km
Equus Freeport Power60 MW7.4 km
Plant No 2 Freeport79 MW7.4 km
Mercy Medical Center4 MW8.1 km