Middletown
Middletown is an oil-fired plant in Middlesex County, Connecticut, operated by Middletown Power LLC. Among the 857 oil-fired plants in the country it is the fifth-largest. It ranks fourth by nameplate capacity among Connecticut’s 182 power plants. It is the biggest of Connecticut’s 23 oil-fired plants. Its biggest unit, rated at 415 MW, is the third-largest single generator in Connecticut.
Nameplate capacity, 2025
786 MW
770 MW net summer capacity
4 operable units
- Oil-fired433 MW55%
- Gas steam turbine353 MW45%
Unit by unit, 1954 to 2025
operating in 2025retiredbar height follows unit size
Among Connecticut’s plants
Largest plants in the state by nameplate capacity, with the plants ranked next to this one.
- 1Millstone2,260 MW
- 2CPV Towantic Energy Center842 MW
- 3Lake Road Generating Plant840 MW
- 4Middletownthis plant
- 5Kleen Energy Systems693 MW
- 6New Haven Steam642 MW
Other rankings
- All US power plants
- 422nd of 14,286
- Plants in the ISO New England balancing area
- 11th of 1,475
Operable units
Two units can switch between natural gas and oil. By the year its oldest working unit started, it is the third-oldest of Connecticut’s oil-fired plants.
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 2 | Gas steam turbine | 114 MW | 117 MW | 1958 | Out of service |
| 3 | Gas steam turbine | 239 MW | 236 MW | 1964 | Out of service |
| 10 | Oil-fired | 18.5 MW | 17.2 MW | 1966 | Out of service |
| 4 | Oil-fired | 415 MW | 400 MW | 1973 | Out of service |
Retired units
Retired capacity here totals 69 MW, mostly oil-fired units.
| Unit | Technology | Nameplate | In service |
|---|---|---|---|
| 1 | Oil-fired | 69 MW | 1954–1998 |
Grid and site
- Balancing area
- ISO New England
- Reliability region
- Northeast Power Coordinating Council
- Highest grid connection voltage
- 345 kV
- Water source
- Connecticut River
- Nearest town on record
- Middletown
- Operator type
- Independent producer
- Coordinates
- 41.555°N, 72.579°W
Closest plants
| Plant | Runs on | Capacity | Distance |
|---|---|---|---|
| GenConn Middletown LLC | Oil and petroleum | 242 MW | 0.1 mi east |
| Kleen Energy Systems | Natural gas | 693 MW | 0.9 mi west |
| Wesleyan University Cogen 1 | Natural gas | 2.4 MW | 3.9 mi west |
| DWW Solar ll | Solar | 36.9 MW | 5.5 mi east |
| CP Middletown Solar I LLC | Solar | 1 MW | 6.6 mi west |
| CP Middletown Solar II LLC | Solar | 1 MW | 6.6 mi west |
| Town of Rocky Hill PV CSG | Solar | 3 MW | 6.7 mi northwest |
| FDX010.0 FedEx Fuel Cell | Natural gas | 1 MW | 7.5 mi west |