5th largest plant in Connecticut · 507th nationally
Kleen Energy Systems Project is a natural gas power plant in Connecticut with a nameplate capacity of 693 MW. It generates roughly 2.7M MWh per year — enough to power about 257,153 average U.S. homes.
Its capacity factor of 44% puts it in the middle range — running steadily but not full-time. At 825 lb CO₂/MWh, its emission rate sits above the national grid average of roughly 800 lb/MWh.
Ghost bars are each month's theoretical maximum (693 MW nameplate × hours in the month). Filled bars are actual net generation reported to EIA Form 923. The gap between them is capacity factor made visible.
| Plant Name | Kleen Energy Systems Project |
|---|---|
| Operator | Kleen Energy Systems, Llc |
| City | Middletown |
| County | Middlesex County |
| State | Connecticut |
| ZIP | 06457 |
| Coordinates | 41.55323, -72.59687 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| ST | Natural Gas Fired Combined Cycle | Natural Gas | 295 MW | Operating | 2011 |
| U1 | Natural Gas Fired Combined Cycle | Natural Gas | 199 MW | Operating | 2011 |
| U2 | Natural Gas Fired Combined Cycle | Natural Gas | 199 MW | Operating | 2011 |
| CO₂ | 1.1M metric tons |
|---|---|
| SO₂ | 6 metric tons |
| NOₓ | 65 metric tons |
| CO₂ Rate | 825 lb/MWh |
Annual totals and CO₂ rate reported by EPA eGRID for 2023. Reference averages are approximate U.S.-wide figures from the same dataset.
| NERC Region | NPCC |
|---|---|
| Balancing Authority | Iso New England Inc. |
Natural gas plants are the workhorse of the modern grid. Combined-cycle units achieve very high efficiency and can ramp up and down quickly to balance variable renewables. They emit roughly half the CO₂ per MWh of coal and far less of other pollutants, but they still release upstream methane during fuel extraction.