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

25 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.

EIA-860M names City of St Marys - (OH) 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 St Marys LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — City of St Marys - (OH) 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 "St Marys LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is St Marys still running?

EIA-860M files it as "Standby/Backup" for 2026-07. Statuses change monthly, and this page follows the monthly release.

St Marys

St Marys is a 25 MW oil-fired power plant in Auglaize County, Ohio, operated by City of St Marys - (OH). EIA-860M lists 2 generating units here, inside PJM. Its units entered service between 1992 and 1999.

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: 25 MW; 22.4 MW net summer
Generating units: 2
In service: 1992–1999
EIA plant ID: 2942

Where it is

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County: Auglaize County, Ohio
Coordinates: 40.5458, -84.3889
Balancing authority: PJM
Sector: Electric Utility

Units, technology and status

Operator of record: City of St Marys - (OH)
Primary energy source: Petroleum
Technologies: Natural Gas Fired Combustion Turbine, Petroleum Liquids
Status: Standby/Backup

This site runs on more than one energy source. EIA-860M capacity splits: Petroleum 14 MW, Natural gas 11 MW. It is filed here under Petroleum, the source with the most capacity.

Every plant City of St Marys - (OH) reports to EIA →

St Marys: FAQ

Where is St Marys?: In Auglaize County, Ohio (OH). 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 St Marys?: 25 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
Who owns St Marys?: EIA-860M names City of St Marys - (OH) 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 St Marys LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — City of St Marys - (OH) 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 "St Marys LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is St Marys still running?: EIA-860M files it as "Standby/Backup" for 2026-07. Statuses change monthly, and this page follows the monthly release.