Cos Cob
Oil power plant in Fairfield County, Connecticut. 115 MW of nameplate capacity across 5 generators, operated by Connecticut Jet Power LLC.
Also known as Cos Cob Jet · EIA plant 542
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Key facts
- Capacity
- 115 MWNameplate
- Generators
- 5 operatingEIA-860M, August 2026
- Operating since
- September 1969First generator online
- Operator
- Connecticut Jet Power LLCEIA operator ID 22379
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 5 ISONE nodesResource nodes with prices
- Location
- Fairfield County, CT41.0289, −73.5989
- EIA plant ID
- 542EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Cos Cob produces
Free · EIA-923Net generation, 2025
1.60 GWh
1,601 MWh, final
Capacity factor, 2025
0.2%
2024: 0.1%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
0.7–3.1
GWh a year. Low 2024, high 2018
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 661 | Not reported | 12 of 12 |
| 2001 | 1,985 | Not reported | 12 of 12 |
| 2002 | 1,713 | Not reported | 12 of 12 |
| 2003 | 1,667 | Not reported | 11 of 12 |
| 2004 | 1,119 | Not reported | 12 of 12 |
| 2005 | 3,151 | Not reported | 12 of 12 |
| 2006 | 2,062 | Not reported | 12 of 12 |
| 2007 | 1,674 | Not reported | 12 of 12 |
| 2008 | 1,625 | Not reported | 12 of 12 |
| 2009 | 3,277 | Not reported | 12 of 12 |
| 2010 | 4,478 | 0.4% | 12 of 12 |
| 2011 | 1,435 | 0.1% | 12 of 12 |
| 2012 | 1,853 | 0.2% | 12 of 12 |
| 2013 | 595 | 0.1% | 12 of 12 |
| 2014 | 4,743 | 0.5% | 12 of 12 |
| 2015 | 1,723 | 0.2% | 12 of 12 |
| 2016 | 1,324 | 0.1% | 12 of 12 |
| 2017 | 2,607 | 0.3% | 12 of 12 |
| 2018 | 3,102 | 0.3% | 12 of 12 |
| 2019 | 736 | 0.1% | 12 of 12 |
| 2020 | 930 | 0.1% | 12 of 12 |
| 2021 | 903 | 0.1% | 12 of 12 |
| 2022 | 1,418 | 0.1% | 12 of 12 |
| 2023 | 1,298 | 0.1% | 12 of 12 |
| 2024 | 676 | 0.1% | 12 of 12 |
| 2025 | 1,601 | 0.2% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 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 · ISONEEmissions
Free · EPA CAMPDCO₂, 2025
Not reported
US short tons. 2024: Not reported
SO₂, 2025
Not reported
US short tons
NOx, 2025
2
US short tons
0 of 5 EPA units reported CO₂ in 2025 (10, 11, 12, 13, 14), matched to EIA plant 542 through the EPA–EIA crosswalk.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| UN10 | Petroleum Liquids | 25.0 | September 1969 |
| UN11 | Petroleum Liquids | 25.0 | September 1969 |
| UN12 | Petroleum Liquids | 25.0 | October 1969 |
| UN13 | Petroleum Liquids | 20.0 | June 2008 |
| un14 | Petroleum Liquids | 20.0 | June 2008 |
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 Connecticut Jet Power 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 Cos Cob
More plants operated by Connecticut Jet Power LLC
Questions about Cos Cob
How much power does Cos Cob produce?
Cos Cob reported 1,601 MWh (1.60 GWh) of net generation in 2025, a 0.2% capacity factor on 115 MW of nameplate capacity.
Where is Cos Cob?
Cos Cob is in Fairfield County, Connecticut, at 41.0289, −73.5989. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Cos Cob?
EIA-860M for August 2026 lists Connecticut Jet Power LLC as the operator (EIA operator ID 22379). The operator is not always the owner.
When did Cos Cob start operating?
Its first generator began operating in September 1969, according to EIA-860M.
Does InfraMap have power prices for Cos Cob?
Yes. InfraMap has ISONE day-ahead and real-time prices at 5 price nodes linked to Cos Cob, 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
- ISONE day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page