Middletown — Plant Summary
- EIA Plant ID
- 562
- Capacity
- 786.4 MW
- Primary Fuel
- RFO
- Technology
- Natural Gas Steam Turbine, Petroleum Liquids
- Status
- Operating
- Location
- Middlesex, CT
- Operating Since
- 1958
- Generators
- 4
- Operator
- Middletown Power LLC
- Parent Company
- —
- Annual Generation
- 41,380.95 MWh
- Capacity Factor
- 0.6%
- Balancing Authority
- ISO New England Inc.
- ISO/RTO
- ISONE
- NERC Region
- NPCC
Middletown
OperatingDistillate OilNatural GasResidual OilHybrid
Ranked #1 of 3 Residual Oil plants in CT#4 of 13 nationally
786.4 MW Natural Gas Steam Turbine (353 MW) + Petroleum Liquids (433 MW) operating in Middlesex, CT — ISO New England Inc.
EIAWD
786.4 MW
Nameplate Capacity
4
Generators
units
Hybrid (2)
Technology
Natural Gas Steam Turbine + Petroleum Liquids
1958
Operating Since
Location
Coordinates
41.5549, -72.5791
County
Middlesex, CT
Nearby Plants
- Elevate MiddletownBESS275 MW · 0.1 km
- GenConn Middletown LLCKerosene242 MW · 0.4 km
- Kleen Energy Systems ProjectNatural Gas693 MW · 1.6 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Middletown Power LLC | — | — |
| Owner(s) | Middletown Power LLC | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
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
Engineering & Generators
Grid Context
NERC Region
NPCC
Balancing Authority
ISO New England Inc.
Grid Voltage
345 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
17.5K MWh
Latest Month
41.4K MWh
Annual Generation
0.6%
Capacity Factor
Jan 2022 – Dec 2024
Financial Data
No financial data available for this plant.
Pricing & Market Data
HIGH confidencePoint 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
News & Articles (10)Beta
General
The reality of what kept CT warm during the deep freeze. It’s stress for state, regional power grids
During the snowy morning of January 25, oil was responsible for the greatest percentage of ISO's power production, at 7753 megawatts.
Hartford Courant·4 weeks ago
General
The reality of what kept CT warm during the deep freeze. It’s stress for state, regional power grids
During the snowy morning of January 25, oil was responsible for the greatest percentage of ISO's power production, at 7753 megawatts.
Hartford Courant·4 weeks ago
General
The reality of what kept CT warm during the deep freeze. It’s stress for state, regional power grids
During the snowy morning of January 25, oil was responsible for the greatest percentage of ISO's power production, at 7753 megawatts.
Hartford Courant·4 weeks ago
General
The reality of what kept CT warm during the deep freeze. It’s stress for state, regional power grids
During the snowy morning of January 25, oil was responsible for the greatest percentage of ISO's power production, at 7753 megawatts.
Hartford Courant·4 weeks ago
Last updated 2026-03-26
View all 10 articles