Pfizer Groton Plant
New London County, Connecticut · EIA plant ID 54236 · Operator: Pfizer Inc
Nameplate38MWSummer 32 MW
Generators4in service
Net generation82GWh12 mo to Aug 2026
Capacity factor29%gas/coal/oil units, summer MW
Heat rate4,546Btu/kWhfossil units, electric fuel, HHV
First online1952Runs 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
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 | 91.6 | — | — |
| 2002 | 101.8 | — | — |
| 2003 | 94.2 | 33.1% | 6,260 |
| 2004 | 90.2 | 31.6% | 4,685 |
| 2005 | 76.5 | 29.1% | 4,685 |
| 2006 | 64.8 | 24.6% | 4,685 |
| 2007 | 62.5 | 23.8% | 4,685 |
| 2008 | 41.2 | 16.0% | 4,499 |
| 2009 | 84.9 | 29.8% | 7,342 |
| 2010 | 106.8 | 31.4% | 8,747 |
| 2011 | 108.3 | 31.8% | 9,068 |
| 2012 | 91.8 | 26.9% | 8,974 |
| 2013 | 84.8 | 24.9% | 8,877 |
| 2014 | 75.8 | 22.3% | 8,931 |
| 2015 | 90.9 | 27.7% | 8,345 |
| 2016 | 90.7 | 32.9% | 4,489 |
| 2017 | 87.2 | 31.7% | 4,489 |
| 2018 | 87 | 31.6% | 4,489 |
| 2019 | 92.4 | 33.0% | 4,563 |
| 2020 | 87 | 30.9% | 4,607 |
| 2021 | 75.9 | 27.1% | 4,545 |
| 2022 | 75.2 | 26.8% | 4,536 |
| 2023 | 72.8 | 26.0% | 4,532 |
| 2024 | 77.7 | 27.6% | 4,532 |
| 2025 | 75 | 26.8% | 4,531 |
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 mo140,693 MMBtu
Last month with liquid burnMar 2026
Switch while operatingYes
Net summer MW on gas10
Net summer MW on oil10
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 ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GT-1 | Natural Gas Fired Combustion Turbine | GT | 10 | 9.5 | Sep 2009 | Operating | — | coming soon |
| TG 3 | Natural Gas Steam Turbine | ST | 10 | 10 | Jan 1952 | Operating | — | coming soon |
| TG 4 | Natural Gas Steam Turbine | ST | 10 | 5 | Jan 1994 | Operating | — | coming soon |
| TG5 | Natural Gas Steam Turbine | ST | 7.5 | 7.5 | Aug 2001 | Operating | — | coming soon |
| TG 1 | Natural Gas Steam Turbine | ST | 2.5 | 2.5 | Jan 1948 | Retired Jan 2005 | — | coming soon |
| TG 2 | Natural Gas Steam Turbine | ST | 2.5 | 2.5 | Jan 1948 | Retired Jun 2015 | — | coming soon |
Owner / operator
Operator: Pfizer Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Pfizer Inc | 100.0% | 38 MW |
Nearby plants
Within 80 km.
| Pfizer Groton Fuel Cell | 6 MW | 0.7 km |
| Yale New Haven - New London | 2 MW | 2.3 km |
| Groton Flanders Road Landfill | — | 3.2 km |
| Bridge Street 1 & 2 | 5 MW | 3.5 km |
| Water Treatment 1 & 2 | 5 MW | 3.6 km |
| Gary Court 1 & 2 | 5 MW | 4.9 km |