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786.4 MW Natural Gas Steam Turbine (353 MW) + Petroleum Liquids (433 MW) operating in Middlesex, CT — ISO New England Inc.
786.4 MW
Nameplate Capacity
4
Generators
units
Hybrid (2)
Technology
Natural Gas Steam Turbine + Petroleum Liquids
1958
Operating Since
Coordinates
41.5549, -72.5791
County
Middlesex, CT
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Middletown Power LLC | — | — |
| Owner(s) | Middletown Power LLC | — | — |
| Status | Operating | — | — |
The Middletown power plant, located in Middlesex County, Connecticut, has a total capacity of 786.4 MW across four generators. The plant's primary fuel source is natural gas, and it also utilizes petroleum liquids. It began operating in 1958 and is owned and operated by Middletown Power LLC. The plant is the third-largest of eight power plants in Connecticut, and ranks 260th out of 945 plants nationally.
Middletown is a hybrid plant utilizing natural gas steam turbine technology. The plant operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region. In the latest year for which data is available, the plant generated 41,381 MWh, achieving a capacity factor of 0.6%.
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
17.5K MWh
Latest Month
41.4K MWh
Annual Generation
0.6%
Capacity Factor
CO₂ Intensity
1535 lb/MWh
NOx
2 lb/MWh
SO₂
2013
$765/kW
Est. Construction Cost
Total estimated cost: $601.3M
Point of Interconnection
Nearest Substation
Middletown Substation · 115 kV
Substation Distance
< 10 km
Operator
Eversource
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
un.laurel 22 mid4
Pricing Hub
.Z.CONNECTICUT
Node Source
EIA-860 direct report
Last updated 2026-04-09
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ask pi about MiddletownISO New England Inc. (ISNE)
Grid Voltage
345.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
0.822 lb/MWh
CH₄
0.037 lb/MWh
N₂O
0.005 lb/MWh
Capacity Factor
1.9%
Annual Net Gen
173 GWh
CO₂eq
1537 lb/MWh
Subregion
NPCC New England