Hardin Generator Project
Big Horn County, Montana · EIA plant ID 55749 · Operator: Heorot Power Management
Nameplate116MWSummer 107 MW
Generators1in service
Net generation178GWh12 mo to Dec 2025
Capacity factor19%gas/coal/oil units, summer MW
Heat rate14,354Btu/kWhfossil units, electric fuel, HHV
First online2006Runs 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) |
|---|---|---|---|
| 2006 | 489.4 | 61.4% | 11,821 |
| 2007 | 728.5 | 77.7% | 12,778 |
| 2008 | 610.9 | 65.0% | 12,223 |
| 2009 | 790 | 84.3% | 12,266 |
| 2010 | 793.9 | 84.7% | 12,217 |
| 2011 | 645.6 | 68.9% | 12,370 |
| 2012 | 467.2 | 49.7% | 12,046 |
| 2013 | 614.9 | 65.6% | 12,209 |
| 2014 | 679.8 | 72.5% | 12,513 |
| 2015 | 490 | 52.3% | 12,347 |
| 2016 | 349.1 | 37.1% | 12,066 |
| 2017 | 118.3 | 12.6% | 12,731 |
| 2018 | 147.4 | 15.7% | 13,384 |
| 2019 | 137.2 | 14.6% | 12,143 |
| 2020 | 51.7 | 5.5% | 14,045 |
| 2021 | 481.7 | 51.4% | 13,302 |
| 2022 | 493.9 | 52.7% | 13,025 |
| 2023 | 435.4 | 46.5% | 13,509 |
| 2024 | 481 | 51.2% | 12,997 |
| 2025 | 177.9 | 19.0% | 14,354 |
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 |
|---|---|---|---|---|---|---|---|---|
| UNT1 | Conventional Steam Coal | ST | 115.7 | 107 | Mar 2006 | Operating | — | coming soon |
Owner / operator
Operator: Heorot Power Management. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Heorot Power Management | 100.0% | 116 MW |
Nearby plants
Within 80 km.
| South Mills Solar, LLC | 3 MW | 4 km |
| Yellowtail | 278 MW | 57.3 km |
| Yellowstone Energy LP | 68 MW | 64.5 km |
| Phillips 66 Billings Refinery | 2 MW | 69.2 km |
| Western Sugar Cooperative - Billings | 2 MW | 69.8 km |
| Colstrip Energy LP | 46 MW | 77.1 km |