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693 MW Natural Gas operating in Middlesex, CT — ISO New England Inc.
693 MW
Nameplate Capacity
3
Generators
units
Natural Gas Fired Combined Cycle
Technology
2011
Operating Since
Coordinates
41.5549, -72.5983
County
Middlesex, CT
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Kleen Energy Systems, LLC | — | — |
| Owner(s) | Kleen Energy Systems, LLC | — | — |
| Status | Operating | — | — |
The Kleen Energy Systems Project is a 693 MW natural gas-fired combined cycle power plant located in Middlesex County, Connecticut. The plant, which began operating in 2011, is owned and operated by Kleen Energy Systems, LLC. It consists of three generators and operates within the ISO New England Inc. balancing authority. The plant is located within the Northeast Power Coordinating Council (NPCC) NERC region.
In the most recent year with available data, the Kleen Energy Systems Project generated 3,216,190 MWh of electricity, achieving a capacity factor of 52.9%. The plant ranks as the 4th largest out of 8 power plants in Connecticut, and 315th out of 945 plants nationally. Financial data indicates a power purchase agreement (PPA) price of $13.4 per MWh, as reported to FERC.
Generated from EIA, GEM, and public data sources
ISO/RTO
ISO-NE
Market
ISO/RTO Member
NERC Region
NPCC — Northeast Power Coordinating Council
Balancing Authority
ISO New England Inc. (ISNE)
Grid Voltage
345.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
273.5K MWh
Latest Month
3.2M MWh
Annual Generation
52.9%
Capacity Factor
CO₂ Intensity
825 lb/MWh
NOx
0.048 lb/MWh
SO₂
0.004 lb/MWh
CH₄
0.016 lb/MWh
N₂O
0.002 lb/MWh
Capacity Factor
44.5%
Annual Net Gen
2700 GWh
CO₂eq
826 lb/MWh
Subregion
NPCC New England
Kleen Energy Systems, LLC · Data from 2019–2025
$13.4/MWh
PPA Price
Point of Interconnection
Nearest Substation
Kleen Substation · 345 kV
Substation Distance
< 10 km
Operator
Eversource
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
14614
Pricing Hub
.Z.CONNECTICUT
Node Source
EIA-860 direct report
Last updated 2026-03-26
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