Montville Station
New London County, Connecticut · EIA plant ID 546 · Operator: NRG Montville Operations Inc
Nameplate495MWSummer 496 MW
Generators4in service
Net generation133GWh12 mo to Dec 2025
Capacity factor2%gas/coal/oil units, summer MW
Heat rate13,616Btu/kWhfossil units, electric fuel, HHV
First online1954Runs 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 | 637.1 | — | — |
| 2002 | 299.8 | — | — |
| 2003 | 249.3 | 5.7% | 12,461 |
| 2004 | 159.4 | 3.7% | 12,277 |
| 2005 | 551.9 | 12.7% | 11,781 |
| 2006 | 161.8 | 3.7% | 12,284 |
| 2007 | 91 | 2.1% | 13,022 |
| 2008 | 39.3 | 0.9% | 11,665 |
| 2009 | 33.5 | 0.8% | 12,720 |
| 2010 | 92.3 | 2.1% | 12,817 |
| 2011 | 28.2 | 0.7% | 12,919 |
| 2012 | 30.3 | 0.7% | 13,591 |
| 2013 | 31.4 | 0.7% | 11,285 |
| 2014 | 49.1 | 1.1% | 12,717 |
| 2015 | 13.3 | 0.3% | 14,147 |
| 2016 | 13.5 | 0.3% | 15,997 |
| 2017 | 45.3 | 1.0% | 12,669 |
| 2018 | 75.6 | 1.7% | 12,508 |
| 2019 | 10.1 | 0.2% | 14,107 |
| 2020 | 11.9 | 0.3% | 22,428 |
| 2021 | 26.9 | 0.6% | 15,249 |
| 2022 | 97.4 | 2.2% | 16,355 |
| 2023 | 36.2 | 0.8% | 14,483 |
| 2024 | 27.8 | 0.6% | 12,859 |
| 2025 | 133.2 | 3.1% | 13,616 |
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 |
|---|---|---|---|---|---|---|---|---|
| 10 | Petroleum Liquids | IC | 2.7 | 2.7 | Jan 1967 | Operating (Standby / backup) | — | coming soon |
| 11 | Petroleum Liquids | IC | 2.7 | 2.7 | Jan 1967 | Operating (Standby / backup) | — | coming soon |
| 5 | Natural Gas Steam Turbine | ST | 75 | 81 | Jan 1954 | Operating | — | coming soon |
| 6 | Petroleum Liquids | ST | 414.9 | 410 | Jan 1971 | Operating | — | coming soon |
| UN10 | Petroleum Liquids | IC | 2.7 | 2.7 | Jan 1967 | not_current | — | coming soon |
| UN11 | Petroleum Liquids | IC | 2.7 | 2.6 | Jan 1967 | not_current | — | coming soon |
| UNT5 | Petroleum Liquids | ST | 75 | 81 | Jan 1954 | not_current | — | coming soon |
| UNT6 | Petroleum Liquids | ST | 414.9 | 410 | Jan 1971 | not_current | — | coming soon |
Owner / operator
Operator: NRG Montville Operations Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| NRG Montville Operations Inc | 100.0% | 495 MW |
Nearby plants
Within 80 km.
| Subase Microgrid Project | 7 MW | 3.4 km |
| Naval Sub Base New London Fuel Cell | 7 MW | 3.4 km |
| Rand Whitney CHP Plant | 17 MW | 4 km |
| CMEEC - Navy NE Trident | 1 MW | 4.1 km |
| Fort Hill 1, 2, 3 & 4 | 10 MW | 4.8 km |
| Connecticut College | 1 MW | 5.2 km |