In Middlesex County, Connecticut (CT). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.

How big is Middletown?

786 MW of nameplate capacity across 4 units, as of the EIA-860M release for 2026-07.

EIA-860M names Middletown Power LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.

Is this the same as Middletown LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Middletown Power LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Middletown LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Middletown still running?

EIA-860M files it as "Out of service and NOT expected to return to service in next calendar year" for 2026-07. Statuses change monthly, and this page follows the monthly release.

Middletown

Middletown is a 786 MW oil-fired power plant in Middlesex County, Connecticut, operated by Middletown Power LLC. EIA-860M lists 4 generating units here, inside ISO New England. Its units entered service between 1958 and 1973.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Nameplate capacity: 786.4 MW; 770.2 MW net summer
Generating units: 4
In service: 1958–1973
EIA plant ID: 562

Where it is

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County: Middlesex County, Connecticut
Coordinates: 41.5549, -72.5791
Balancing authority: ISNE
Sector: IPP Non-CHP

Units, technology and status

Operator of record: Middletown Power LLC
Primary energy source: Petroleum
Technologies: Natural Gas Steam Turbine, Petroleum Liquids
Status: Out of service and NOT expected to return to service in next calendar year

This site runs on more than one energy source. EIA-860M capacity splits: Petroleum 433 MW, Natural gas 353 MW. It is filed here under Petroleum, the source with the most capacity.

Every plant Middletown Power LLC reports to EIA →

Middletown: FAQ

Where is Middletown?: In Middlesex County, Connecticut (CT). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
How big is Middletown?: 786 MW of nameplate capacity across 4 units, as of the EIA-860M release for 2026-07.
Who owns Middletown?: EIA-860M names Middletown Power LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
Is this the same as Middletown LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Middletown Power LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Middletown LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Middletown still running?: EIA-860M files it as "Out of service and NOT expected to return to service in next calendar year" for 2026-07. Statuses change monthly, and this page follows the monthly release.