MiddletownOut of service
Middlesex County, Connecticut · EIA plant ID 562 · Operator: Middletown Power LLC
Nameplate786MWSummer 770 MW
Generators4in service
Net generation87GWh12 mo to Dec 2025
Capacity factor1%gas/coal/oil units, summer MW
Heat rate14,486Btu/kWhfossil units, electric fuel, HHV
First online1958Runs 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 | 1,574.8 | — | — |
| 2002 | 542.4 | — | — |
| 2003 | 457.8 | 6.3% | 11,052 |
| 2004 | 465.8 | 6.3% | 11,246 |
| 2005 | 938.3 | 12.8% | 11,313 |
| 2006 | 510.8 | 7.6% | 11,877 |
| 2007 | 500.7 | 7.4% | 11,565 |
| 2008 | 159.1 | 2.4% | 12,247 |
| 2009 | 152 | 2.3% | 11,779 |
| 2010 | 314.5 | 4.7% | 12,295 |
| 2011 | 101.8 | 1.5% | 12,528 |
| 2012 | 180.1 | 2.7% | 11,585 |
| 2013 | 108.5 | 1.6% | 12,087 |
| 2014 | 234.9 | 3.5% | 11,406 |
| 2015 | 423.3 | 6.3% | 11,508 |
| 2016 | 256.8 | 3.8% | 11,403 |
| 2017 | 222 | 3.3% | 11,282 |
| 2018 | 379.7 | 5.6% | 11,936 |
| 2019 | 192.9 | 2.9% | 15,393 |
| 2020 | 294.8 | 4.4% | 11,920 |
| 2021 | 154.6 | 2.3% | 13,137 |
| 2022 | 188.2 | 2.8% | 13,192 |
| 2023 | 169.8 | 2.5% | 11,766 |
| 2024 | 33 | 0.5% | 17,189 |
| 2025 | 86.8 | 1.3% | 14,486 |
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 | GT | 18.5 | 17.2 | Aug 1966 | Operating (Out of service) | — | coming soon |
| 2 | Natural Gas Steam Turbine | ST | 113.6 | 117 | Oct 1958 | Operating (Out of service) | — | coming soon |
| 3 | Natural Gas Steam Turbine | ST | 239.4 | 236 | Jan 1964 | Operating (Out of service) | — | coming soon |
| 4 | Petroleum Liquids | ST | 414.9 | 400 | May 1973 | Operating (Out of service) | — | coming soon |
| 1 | Petroleum Liquids | ST | 69 | 66.3 | Aug 1954 | Retired Oct 1998 | — | coming soon |
Owner / operator
Operator: Middletown Power LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Middletown Power LLC | 100.0% | 786 MW |
Nearby plants
Within 80 km.
| Elevate Middletown | — | 0.1 km |
| GenConn Middletown LLC | 242 MW | 0.2 km |
| Kleen Energy Systems Project | 693 MW | 1.5 km |
| CJTS Energy Center | retired | 3.8 km |
| Wesleyan University Cogen 1 | 2 MW | 6.2 km |
| DWW Solar ll | 37 MW | 8.8 km |