A.J. Mihm Generating Station
Baraga County, Michigan · EIA plant ID 61391 · Operator: Upper Michigan Energy Resources Company
Nameplate56MWSummer 57 MW
Generators3in service
Net generation185GWh12 mo to Dec 2025
Capacity factor37%gas/coal/oil units, summer MW
Heat rate8,493Btu/kWhfossil units, electric fuel, HHV
First online2019Runs as intermediate
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) |
|---|---|---|---|
| 2019 | 187.6 | 45.5% | 8,343 |
| 2020 | 246 | 49.3% | 8,307 |
| 2021 | 237.5 | 48.0% | 8,461 |
| 2022 | 222 | 44.9% | 8,485 |
| 2023 | 207.9 | 42.0% | 8,434 |
| 2024 | 170.3 | 34.3% | 8,571 |
| 2025 | 184.5 | 37.3% | 8,493 |
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 |
|---|---|---|---|---|---|---|---|---|
| M1 | Natural Gas Internal Combustion Engine | IC | 18.8 | 18.9 | Mar 2019 | Operating | — | coming soon |
| M2 | Natural Gas Internal Combustion Engine | IC | 18.8 | 18.8 | Mar 2019 | Operating | — | coming soon |
| M3 | Natural Gas Internal Combustion Engine | IC | 18.8 | 18.8 | Mar 2019 | Operating | — | coming soon |
Owner / operator
Operator: Upper Michigan Energy Resources Company. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Upper Michigan Energy Resources Company | 100.0% | 56 MW |
Nearby plants
Within 80 km.
| Prickett | 2 MW | 8.3 km |
| John H Warden | 22 MW | 12.7 km |
| Portage | retired | 32.1 km |
| Victoria Dam | 12 MW | 46.6 km |
| White Pine Electric Power | retired | 72.6 km |
| Way Dam | 2 MW | 76.2 km |