Kleen Energy Systems
Natural gas power plant · Middlesex County, Connecticut
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combined Cycle
- Operator
- Kleen Energy Systems, LLC
- County
- Middlesex County
- Generating units
- 3
- Share of state capacity
- 6.30%
- Rank among natural gas plants in Connecticut
- #3 of 47
- EIA plant code
- 56798
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| ST | Natural Gas Fired Combined Cycle | 295 MW | 268 MW | 2011 | Operating |
| U1 | Natural Gas Fired Combined Cycle | 199 MW | 177 MW | 2011 | Operating |
| U2 | Natural Gas Fired Combined Cycle | 199 MW | 177 MW | 2011 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Connecticut
| Lake Road Generating Plant | Natural gas | 840 MW |
| Middletown | Other | 786 MW |
| New Haven Steam | Other | 642 MW |
| Milford Power Project | Natural gas | 578 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 693 MW solar plant and a 693 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Connecticut power plants · What Connecticut actually generates