Holter
1390 Holter Dam Road, Wolf Creek, MT 59648Plant Summary Information
Holter is ranked #27 out of 71 power plants in Montana in terms of total annual net electricity generation.
Holter is comprised of 4 generators and generated 53.0 GWh during the 3-month period between September 2025 to December 2025.
| Plant Name | Holter |
|---|---|
| Utility Name | NorthWestern Energy (MT Hydro) |
| Location | Cascade County, MT |
| Initial Operation Date | July 1918 |
| Last Update | Dec 2025 |
| Annual Generation | 247.5 GWh |
| Annual Consumption | 910.9 k MMBtu |
| Ranked #2,283 out of 13,081 Power Plants Nationwide | |
| Ranked #179 out of 1,311 Water Power Plants Nationwide | |
| Ranked #27 out of 71 Montana Power Plants | |
| Ranked #11 out of 23 Montana Water Power Plants | |
| Fuel Types | Water |
| Previous Operators |
PPL Montana LLC (2013 to 2013) NorthWestern Energy (2014 to 2020) NorthWestern Energy (MT hdro) (2021 to 2021) NorthWestern Energy (MT Hydro) (2022 to 2025) |
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Monthly Net Generation for Holter
Monthly Plant Fuel Consumption for Holter
Holter Details
| Summary Information | |
|---|---|
| Plant Name | Holter (2186) |
| Plant Address | 1390 Holter Dam Road, Wolf Creek, MT 59648 |
| Utility | NorthWestern Energy (MT Hydro) (13902) |
| Latitude, Longitude | 46.9915, -112.0047 |
| Generation Dates on File | Jan 2001 to Dec 2025 |
| Initial Operation Date | July 1918 |
| Annual Generation | 247.5 GWh |
| Fuel Types | Water |
| Federal Energy Regulatory Commission (FERC) Information | |
| FERC Cogeneration Status | No |
| FERC Small Power Producer Status | No |
| FERC Exempt Wholesale Generator Status | Yes |
| FERC Exempt Wholesale Generator Docket Number | 99-185-000 |
| Regulatory Information | |
|---|---|
| Regulatory Status | Regulated |
| NERC Region | WECC |
| Balancing Authority | NorthWestern Energy (NWMT) (NWMT) |
| NAICS Code | Utilities (22) |
| Sector | Electric Utility (1) |
| Water Source | Missouri River |
| Ash Impoundment | No |
| Transmission / Distribution Owner | NorthWestern Energy LLC - (MT) (12825) MT |
| Grid Voltage | 100.00 kV |
| Energy Storage | No |
Generator HOL1 Details Operating July 1918
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Single Owner |
| RTO ISO LMP Node Designation | NA |
| RTO ISO Location Designation For Reporting Wholesale Sales Data | NA |
| Nameplate Capacity | 15 MW |
| Nameplate Power Factor | 0.85 |
| Summer Capacity | 14.96 MW |
| Winter Capacity | 14.96 MW |
| Minimum Load | 1 MW |
| Uprate/Derate Completed | No |
|---|---|
| Status | Operating |
| First Operation Date | July 1918 |
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Water |
| Solid Fuel Gasification | No |
| Carbon Capture Technology | No |
| Time From Cold Shutdown To Full Load | 10M |
| Multiple Fuels | No |
Generator HOL2 Details Operating July 1918
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Single Owner |
| RTO ISO LMP Node Designation | NA |
| RTO ISO Location Designation For Reporting Wholesale Sales Data | NA |
| Nameplate Capacity | 15 MW |
| Nameplate Power Factor | 0.85 |
| Summer Capacity | 14.96 MW |
| Winter Capacity | 14.96 MW |
| Minimum Load | 1 MW |
| Uprate/Derate Completed | No |
|---|---|
| Status | Operating |
| First Operation Date | July 1918 |
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Water |
| Solid Fuel Gasification | No |
| Carbon Capture Technology | No |
| Time From Cold Shutdown To Full Load | 10M |
| Multiple Fuels | No |
Generator HOL3 Details Operating July 1918
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Single Owner |
| RTO ISO LMP Node Designation | NA |
| RTO ISO Location Designation For Reporting Wholesale Sales Data | NA |
| Nameplate Capacity | 15 MW |
| Nameplate Power Factor | 0.85 |
| Summer Capacity | 14.96 MW |
| Winter Capacity | 14.96 MW |
| Minimum Load | 1 MW |
| Uprate/Derate Completed | No |
|---|---|
| Status | Operating |
| First Operation Date | July 1918 |
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Water |
| Solid Fuel Gasification | No |
| Carbon Capture Technology | No |
| Time From Cold Shutdown To Full Load | 10M |
| Multiple Fuels | No |
Generator HOL4 Details OA July 1918
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Single Owner |
| RTO ISO LMP Node Designation | NA |
| RTO ISO Location Designation For Reporting Wholesale Sales Data | NA |
| Nameplate Capacity | 9.6 MW |
| Nameplate Power Factor | 0.8 |
| Summer Capacity | 13.3 MW |
| Winter Capacity | 13.3 MW |
| Minimum Load | 1 MW |
| Uprate/Derate Completed | No |
| Status | OA |
| First Operation Date | July 1918 |
|---|---|
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Water |
| Solid Fuel Gasification | No |
| Carbon Capture Technology | No |
| Time From Cold Shutdown To Full Load | 10M |
| Planned Net Summer Capacity Uprate | 4.1 MW |
| Planned Net Winter Capacity Uprate | 4.1 MW |
| Planned Uprate | July 2026 |
| Multiple Fuels | No |
Holter Plant Owners
| Owner Name | Address | Generator | Ownership | We couldn't locate any owners for this plant |
|---|
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|---|---|---|---|
| #169 | Greenup Hydro | Franklin Furnace, OH | 265.6 GWh |
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| #175 | S C Moore | Littleton, NH | 254.7 GWh |
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| #178 | Millers Ferry | Camden, AL | 250.2 GWh |
| #180 | Exchequer | Snelling, CA | 245.8 GWh |
| #181 | Cabot | Montague, MA | 239.5 GWh |
| #182 | Fremont Canyon | Alcova, WY | 233.5 GWh |
| #183 | Jefferies | Moncks Corner, SC | 233.5 GWh |
| #184 | Donnells | None, CA | 233.4 GWh |
| #185 | J Woodruff | Chattahoochee, FL | 228.5 GWh |
| #186 | Lookout Point | Lowell, OR | 227.0 GWh |
| #187 | Detroit | Mill City, OR | 226.9 GWh |
| #188 | Lost Creek | Trail, OR | 221.3 GWh |
| #189 | Eufaula Dam | Porum, OK | 219.6 GWh |
Nearby Power Plants
Below are closest 20 power plants surrounding Holter.
| Plant Name | Plant Location | Annual Generation | Distance |
|---|---|---|---|
| Basin Creek Plant | Butte, MT | 126.2 GWh | 77.4 mi |
| Black Eagle | Great Falls, MT | 110.3 GWh | 50.5 mi |
| Black Eagle Solar, LLC | Black Eagle, MT | 4.8 GWh | 52.1 mi |
| Broadwater Power Project | Toston, MT | 27.9 GWh | 66.5 mi |
| Canyon Ferry | Helena, MT | 273.1 GWh | 27 mi |
| Cochrane | Great Falls, MT | 215.3 GWh | 53.5 mi |
| Dave Gates Generating Station | Anaconda, MT | 420.9 GWh | 74 mi |
| Fairfield Wind | Fairfield, MT | 27.7 GWh | 50.6 mi |
| GCC Trident Solar Project | Three Forks, MT | 7.0 GWh | 77.3 mi |
| Great Divide Solar, LLC | Canyon Creek, MT | 5.7 GWh | 17.3 mi |
| Green Meadow Solar, LLC | Helena, MT | 5.1 GWh | 20.7 mi |
| Greenfield Wind - MT | Fairfield, MT | 78.6 GWh | 50.6 mi |
| Hauser | Helena, MT | 128.4 GWh | 16.5 mi |
| Horseshoe Bend Wind Park | Great Falls, MT | 21.2 GWh | 43.9 mi |
| Morony | Great Falls, MT | 214.7 GWh | 60.2 mi |
| Rainbow (MT) | Great Falls, MT | 298.6 GWh | 53.1 mi |
| Ryan | Great Falls, MT | 377.3 GWh | 57.5 mi |
| South Peak Wind | Geyser, MT | 272.5 GWh | 69.4 mi |
| Spion Kop Wind Farm | Geyser, MT | 97.7 GWh | 68.4 mi |
| Turnbull Hydro | Fairfield, MT | 19.0 GWh | 42.6 mi |