- Clean firm
- Operating
- 10 · 100 · 1,000 MW
Map
- Clean firm
- Operating
Holter: location. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
Holter
Power plant · Hydro
Key facts
Power plant · Hydroran 52% of 2025 Operating- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1918
- Net generation, 2025
- 247,542 MWh
- Grid
- 100 kV to NorthWestern Energy LLC - (MT) (NWMT)
- Location
- Cascade County, Montana
- Operated by
- NorthWestern Energy (MT Hydro)SourceEIA-860M Preliminary Monthly Electric Generator Inventory
Operations
- Net generation, 2025
- 247,542
MWh - Fuel burned, 2025
- 844,616
MMBtu - Capacity factor, 2025
- 51.7
% - Heat rate, 2025
- Not stated
| Year | Net generation (MWh) | Fuel burned (MMBtu) | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|---|
| 2025 | 247,542 | 844,616 | 51.7% | — |
| 2024 | 265,780 | 906,841 | 55.4% | — |
| 2023 | 281,585 | 960,770 | 58.9% | — |
| 2022 | 225,770 | 770,328 | 47.2% | — |
| 2021 | 200,665 | 1,774,680 | 41.9% | — |
| 2020 | 298,185 | 2,614,188 | 62.2% | — |
| 2019 | 344,893 | 3,071,272 | 72.1% | — |
| 2018 | 341,811 | 3,111,847 | 71.5% | — |
| 2017 | 299,866 | 2,762,667 | 62.7% | — |
| 2016 | 254,064 | 2,345,520 | 53.0% | — |
| 2015 | 258,627 | 2,410,146 | 54.1% | — |
| 2014 | 249,642 | 2,374,095 | 52.2% | — |
| 2013 | 226,345 | 2,159,559 | 47.3% | — |
| 2012 | 283,213 | 2,695,054 | 59.1% | — |
| 2011 | 348,297 | 3,384,054 | 72.8% | — |
| 2010 | 303,864 | 2,964,498 | 63.5% | — |
| 2009 | 319,805 | 3,121,297 | 66.9% | — |
| 2008 | 267,506 | 2,636,003 | 55.8% | — |
| 2007 | 223,234 | 2,206,445 | 46.7% | — |
| 2006 | 279,655 | 2,773,900 | 58.5% | — |
| 2005 | 251,413 | 2,513,879 | 52.6% | — |
| 2004 | 207,124 | 2,075,797 | 43.2% | — |
| 2003 | 250,752 | 2,567,951 | 52.4% | — |
| 2002 | 199,901 | 2,033,593 | 41.8% | — |
| 2001 | 201,580 | 2,082,926 | 42.1% | — |
How these are worked out
Net generation and fuel burned are the monthly figures EIA publishes in its bulk electricity file, from the plant's Form 923 reports; a year is the sum of its months. Capacity factor is a full year's net generation over today's nameplate capacity times the hours in that year (8,784 in a leap year), so a plant uprated or partly retired since reads against its current size; heat rate is fuel burned over net generation, for plants that burn fuel. A year with fewer than twelve months stated has no capacity factor, and a value outside the plausible range is left blank rather than shown. By month, the charts apply the same rules to each month's own hours and fuel.
Sources
3 sourcesSources
- EIA-860M
- GEMGlobal Integrated Power Tracker, Global Energy Monitor, September 2026 release (https://globalenergymonitor.org/projects/global-integrated-power-tracker), CC BY 4.0. Modified by Inframation: TransitionZero-sourced rows removed; statuses and technologies mapped to Inframation's vocabulary; figures aggregated. Copyright © Global Energy Monitor. Global Integrated Power Tracker, September 2026 release. Distributed under a Creative Commons Attribution 4.0 International License.
- EIASource: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)