Hardin Generator Project
Coal power plant in Big Horn County, Montana. 115.7 MW of nameplate capacity across 1 generator, operated by Heorot Power Management.
Also known as Hardin Generating Station · EIA plant 55749
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Key facts
- Capacity
- 115.7 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- March 2006First generator online
- Operator
- Heorot Power ManagementEIA operator ID 16233
- Grid
- NWMTBalancing authority NWMT
- Price nodes
- None linkedNo verified ISO node
- Location
- Big Horn County, MT45.7578, −107.6000
- EIA plant ID
- 55749EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Hardin Generator Project produces
Free · EIA-923Net generation, 2025
178 GWh
177,948 MWh, final
Capacity factor, 2025
17.6%
2024: 47.3%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
51.7–493.9
GWh a year. Low 2020, high 2022
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | 489,442 | Not reported | 12 of 12 |
| 2007 | 728,486 | Not reported | 12 of 12 |
| 2008 | 75,415 | Not reported | 1 of 12 |
| 2009 | 790,037 | Not reported | 12 of 12 |
| 2010 | 793,895 | 78.3% | 12 of 12 |
| 2011 | 645,637 | 63.7% | 12 of 12 |
| 2012 | 467,197 | 46.0% | 12 of 12 |
| 2013 | 614,883 | 60.7% | 12 of 12 |
| 2014 | 679,775 | 67.1% | 12 of 12 |
| 2015 | 489,990 | 48.3% | 12 of 12 |
| 2016 | 349,109 | 34.4% | 12 of 12 |
| 2017 | 118,345 | 11.7% | 12 of 12 |
| 2018 | 147,378 | 14.5% | 12 of 12 |
| 2019 | 137,176 | 13.5% | 12 of 12 |
| 2020 | 51,706 | 5.1% | 12 of 12 |
| 2021 | 481,674 | 47.5% | 12 of 12 |
| 2022 | 493,908 | 48.7% | 12 of 12 |
| 2023 | 435,403 | 43.0% | 12 of 12 |
| 2024 | 481,001 | 47.3% | 12 of 12 |
| 2025 | 177,948 | 17.6% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDCO₂, 2025
306,267
US short tons. 2024: 740,777
SO₂, 2025
143
US short tons
NOx, 2025
125
US short tons
CO₂ per MWh, calculated
1.72 t
About 3,442 lb per MWh
1 of 1 EPA units reported CO₂ in 2025 (U1), matched to EIA plant 55749 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
492
million gallons
Consumption, 2024
492
million gallons
Source
BIGHORN RIVER
Surface, Fresh. Induced-draft tower
Watershed stress
Very low/none · 0.169
USGS SUI, HUC12 Whitman Creek
12 of 12 cooling months report withdrawal. SUI of the source river HUC12 within 3 km. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| UNT1 | Conventional Steam Coal | 115.7 | March 2006 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Heorot Power Management as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Questions about Hardin Generator Project
How much power does Hardin Generator Project produce?
Hardin Generator Project reported 177,948 MWh (178 GWh) of net generation in 2025, a 17.6% capacity factor on 115.7 MW of nameplate capacity.
Where is Hardin Generator Project?
Hardin Generator Project is in Big Horn County, Montana, at 45.7578, −107.6000. It is in the NorthWestern Energy (NWMT) balancing area (NWMT).
Who operates Hardin Generator Project?
EIA-860M for August 2026 lists Heorot Power Management as the operator (EIA operator ID 16233). The operator is not always the owner.
When did Hardin Generator Project start operating?
Its first generator began operating in March 2006, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page