GenConn Middletown LLC
Middlesex County, Connecticut · EIA plant ID 57068 · Operator: GenConn Middletown LLC
Nameplate242MWSummer 188 MW
Generators4in service
Net generation6GWh12 mo to Dec 2025
Capacity factor0%gas/coal/oil units, summer MW
Heat rate10,519Btu/kWhfossil units, electric fuel, HHV
First online2011Runs 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) |
|---|---|---|---|
| 2011 | 16.2 | 1.6% | 11,193 |
| 2012 | 1.7 | 0.1% | 20,988 |
| 2013 | 10.7 | 0.6% | 12,687 |
| 2014 | 13.1 | 0.8% | 12,055 |
| 2015 | 12.3 | 0.7% | 11,080 |
| 2016 | 12.7 | 0.8% | 10,042 |
| 2017 | 9.8 | 0.6% | 10,091 |
| 2018 | 3.2 | 0.2% | 21,734 |
| 2019 | -0.3 | -0.0% | — |
| 2020 | 0.7 | 0.0% | — |
| 2021 | 5.1 | 0.3% | 17,878 |
| 2022 | 4.6 | 0.3% | 18,618 |
| 2023 | 3.5 | 0.2% | 21,338 |
| 2024 | 5.9 | 0.4% | 6,113 |
| 2025 | 6.5 | 0.4% | 10,519 |
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 |
|---|---|---|---|---|---|---|---|---|
| 12 | Petroleum Liquids | GT | 60.5 | 46.9 | Jun 2011 | Operating | — | coming soon |
| 13 | Petroleum Liquids | GT | 60.5 | 46.9 | Jun 2011 | Operating | — | coming soon |
| 14 | Petroleum Liquids | GT | 60.5 | 46.9 | Jun 2011 | Operating | — | coming soon |
| 15 | Petroleum Liquids | GT | 60.5 | 46.9 | Jun 2011 | Operating | — | coming soon |
Owner / operator
Operator: GenConn Middletown LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| GenConn Middletown LLC | 100.0% | 242 MW |
Nearby plants
Within 80 km.
| Elevate Middletown | — | 0.1 km |
| Middletown | 786 MW | 0.2 km |
| Kleen Energy Systems Project | 693 MW | 1.7 km |
| CJTS Energy Center | retired | 4 km |
| Wesleyan University Cogen 1 | 2 MW | 6.4 km |
| DWW Solar ll | 37 MW | 8.6 km |