St Marys
Auglaize County, Ohio · EIA plant ID 2942 · Operator: City of St Marys - (OH)
Nameplate25MWSummer 22 MW
Generators2in service
Net generation0GWh12 mo to Dec 2025
Capacity factor0%gas/coal/oil units, summer MW
Heat rate9,931Btu/kWhfossil units, electric fuel, HHV
First online1992Runs as rarely runs
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 39.4 | — | — |
| 2002 | 43.1 | — | — |
| 2003 | 45.2 | 13.6% | 15,549 |
| 2004 | 31.9 | 9.6% | 15,016 |
| 2005 | 43.5 | 13.1% | 16,585 |
| 2006 | 18.9 | 5.7% | 15,413 |
| 2007 | 28.9 | 9.0% | 14,955 |
| 2008 | 0 | 0.0% | — |
| 2009 | 0 | 0.0% | 24,190 |
| 2010 | 0 | 0.0% | — |
| 2011 | 0.7 | 0.3% | 21,734 |
| 2012 | 0.4 | 0.2% | 20,123 |
| 2013 | 0 | 0.0% | — |
| 2014 | 0.2 | 0.1% | — |
| 2015 | 0.7 | 0.4% | 19,338 |
| 2016 | 0.7 | 0.4% | — |
| 2017 | 0.8 | 0.4% | 20,949 |
| 2018 | 0.2 | 0.1% | 18,975 |
| 2019 | 0.2 | 0.1% | — |
| 2020 | 0.5 | 0.3% | — |
| 2021 | 0.6 | 0.3% | — |
| 2022 | 0.2 | 0.1% | — |
| 2023 | 0.1 | 0.0% | 19,479 |
| 2024 | 0.4 | 0.2% | — |
| 2025 | 0.4 | 0.2% | 9,931 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 7 | Petroleum Liquids | GT | 14 | 12 | Aug 1992 | Operating (Standby / backup) | — | coming soon |
| GT1 | Natural Gas Fired Combustion Turbine | GT | 11 | 10.4 | Dec 1999 | Operating (Standby / backup) | — | coming soon |
| 5 | Conventional Steam Coal | ST | 6 | 5.8 | Jan 1957 | Retired Dec 2007 | — | coming soon |
| 6 | Conventional Steam Coal | ST | 10 | 9 | Apr 1967 | Retired Dec 2007 | — | coming soon |
| AUX | Petroleum Liquids | GT | 0.8 | 0.8 | Sep 1967 | Retired Dec 2007 | — | coming soon |
Owner / operator
Operator: City of St Marys - (OH). Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| City of St Marys - (OH) | 64.2% | 16 MW |
| City of Hamilton - (OH) | 10.5% | 3 MW |
| City of Bowling Green - (OH) | 6.3% | 2 MW |
| City of Niles - (OH) | 5.1% | 1 MW |
| City of Cuyahoga Falls - (OH) | 3.3% | 1 MW |
| City of Wadsworth - (OH) | 2.6% | 1 MW |
| City of Painesville - (OH) | 2.3% | 1 MW |
| City of Dover - (OH) | 2.3% | 1 MW |
| City of Galion | 1.9% | 1 MW |
| City of Amherst- (OH) | 1.6% | 0 MW |
Nearby plants
Within 80 km.
| New Knoxville | retired | 8.5 km |
| HMV Minster Energy Storage System | 7 MW | 16.3 km |
| Celina Solar Project #1, LLC | 4 MW | 17 km |
| Wapakoneta-Pratt | 14 MW | 17.1 km |
| HMW Minster PV I | 3 MW | 17.3 km |
| Minster 3 | 1 MW | 17.3 km |