Cos Cob
Fairfield County, Connecticut · EIA plant ID 542 · Operator: Connecticut Jet Power LLC
Nameplate115MWSummer 96 MW
Generators5in service
Net generation2GWh12 mo to Dec 2025
Capacity factor0%gas/coal/oil units, summer MW
Heat rate14,832Btu/kWhfossil units, electric fuel, HHV
First online1969Runs as rarely runs
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) |
|---|---|---|---|
| 2001 | 2 | 0.4% | 11,897 |
| 2002 | 1.7 | 0.4% | 14,517 |
| 2003 | 1.7 | 0.3% | 14,415 |
| 2004 | 1.1 | 0.2% | 13,912 |
| 2005 | 3.2 | 0.7% | 13,878 |
| 2006 | 2.1 | 0.4% | 13,902 |
| 2007 | 1.7 | 0.4% | 15,574 |
| 2008 | 1.6 | 0.2% | 14,916 |
| 2009 | 3.3 | 0.4% | 15,196 |
| 2010 | 4.5 | 0.5% | 15,283 |
| 2011 | 1.4 | 0.2% | 16,935 |
| 2012 | 1.9 | 0.2% | 14,902 |
| 2013 | 0.6 | 0.1% | — |
| 2014 | 4.7 | 0.6% | 14,128 |
| 2015 | 1.7 | 0.2% | 14,858 |
| 2016 | 1.3 | 0.2% | 15,130 |
| 2017 | 2.6 | 0.3% | 12,913 |
| 2018 | 3.1 | 0.4% | 10,473 |
| 2019 | 0.7 | 0.1% | 15,071 |
| 2020 | 0.9 | 0.1% | 14,101 |
| 2021 | 0.9 | 0.1% | 18,003 |
| 2022 | 1.4 | 0.2% | 14,403 |
| 2023 | 1.3 | 0.1% | 15,018 |
| 2024 | 0.7 | 0.1% | 14,805 |
| 2025 | 1.6 | 0.2% | 14,832 |
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 |
|---|---|---|---|---|---|---|---|---|
| UN10 | Petroleum Liquids | GT | 25 | 19.1 | Sep 1969 | Operating | — | coming soon |
| UN11 | Petroleum Liquids | GT | 25 | 18.7 | Sep 1969 | Operating | — | coming soon |
| UN12 | Petroleum Liquids | GT | 25 | 19.1 | Oct 1969 | Operating | — | coming soon |
| UN13 | Petroleum Liquids | GT | 20 | 19.1 | Jun 2008 | Operating | — | coming soon |
| un14 | Petroleum Liquids | GT | 20 | 19.6 | Jun 2008 | Operating | — | coming soon |
Owner / operator
Operator: Connecticut Jet Power LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Connecticut Jet Power LLC | 100.0% | 115 MW |
Nearby plants
Within 80 km.
| Waterside Power, LLC | 70 MW | 3.7 km |
| Stamford Health | 10 MW | 4.9 km |
| Stamford Health Tully Health Center | 2 MW | 6.7 km |
| White Plains Hospital Medical Center | 6 MW | 12.9 km |
| The Source at White Plains (UBS) | 1 MW | 13.4 km |
| White Plains RFP Shapham Place | 6 MW | 13.4 km |