Grandfather Falls
N5059 Hwy 107, Irma, WI 54442Plant Summary Information
Grandfather Falls is ranked #8 out of 66 hydroelectric power plants in Wisconsin in terms of total annual net electricity generation.
Grandfather Falls is comprised of 2 generators and generated 16.3 GWh during the 3-month period between September 2025 to December 2025.
| Plant Name | Grandfather Falls |
|---|---|
| Utility Name | Wisconsin Public Service Corp |
| Location | Lincoln County, WI |
| Initial Operation Date | December 1938 |
| Last Update | Dec 2025 |
| Annual Generation | 79.1 GWh |
| Annual Consumption | 291.7 k MMBtu |
| Ranked #3,767 out of 13,081 Power Plants Nationwide | |
| Ranked #381 out of 1,311 Water Power Plants Nationwide | |
| Ranked #69 out of 260 Wisconsin Power Plants | |
| Ranked #8 out of 66 Wisconsin Water Power Plants | |
| Fuel Types | Water |
Map of Grandfather Falls
Full Screen MapRegister Now for Comprehensive Access
Subscribe now to access all power plant data, utility information, FERC EQR data, and more for Grandfather Falls.
Monthly Net Generation for Grandfather Falls
Monthly Plant Fuel Consumption for Grandfather Falls
Grandfather Falls Details
| Summary Information | |
|---|---|
| Plant Name | Grandfather Falls (4063) |
| Plant Address | N5059 Hwy 107, Irma, WI 54442 |
| Utility | Wisconsin Public Service Corp (20860) |
| Latitude, Longitude | 45.3019, -89.7917 |
| Generation Dates on File | Jan 2001 to Dec 2025 |
| Initial Operation Date | December 1938 |
| Annual Generation | 79.1 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 | No |
| Regulatory Information | |
|---|---|
| Regulatory Status | Regulated |
| NERC Region | RFC |
| Balancing Authority | Midcontinent Independent Transmission System Operator, Inc.. (MISO) |
| NAICS Code | Utilities (22) |
| Sector | Electric Utility (1) |
| Water Source | Wisconsin River |
| Ash Impoundment | No |
| Transmission / Distribution Owner | American Transmission Co (659) WI |
| Grid Voltage | 115.00 kV |
| Energy Storage | No |
Generator 1 Details Operating December 1938
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Single Owner |
| RTO ISO LMP Node Designation | WPS.WPSM |
| RTO ISO Location Designation For Reporting Wholesale Sales Data | WPS.WPSM |
| Nameplate Capacity | 11 MW |
| Nameplate Power Factor | 0.8 |
| Summer Capacity | 11 MW |
| Winter Capacity | 11 MW |
| Minimum Load | 3 MW |
| Uprate/Derate Completed | No |
|---|---|
| Status | Operating |
| First Operation Date | December 1938 |
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Water |
| Solid Fuel Gasification | No |
| Time From Cold Shutdown To Full Load | 10M |
| Multiple Fuels | No |
Generator 2 Details Operating December 1938
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Single Owner |
| RTO ISO LMP Node Designation | WPS.WPSM |
| RTO ISO Location Designation For Reporting Wholesale Sales Data | WPS.WPSM |
| Nameplate Capacity | 6.2 MW |
| Nameplate Power Factor | 0.8 |
| Summer Capacity | 6.2 MW |
| Winter Capacity | 6.2 MW |
| Minimum Load | 1.5 MW |
| Uprate/Derate Completed | No |
|---|---|
| Status | Operating |
| First Operation Date | December 1938 |
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Water |
| Solid Fuel Gasification | No |
| Time From Cold Shutdown To Full Load | 10M |
| Multiple Fuels | No |
Grandfather Falls Plant Owners
| Owner Name | Address | Generator | Ownership | We couldn't locate any owners for this plant |
|---|
Power Plants with Similar Net Generation
Power plants with a similar annual net generation from Water.
| Rank | Plant Name | Plant Location | Annual Generation |
|---|---|---|---|
| #371 | Kaw Hydro | Ponca City, OK | 81.2 GWh |
| #372 | Jeffrey | Brady, NE | 81.0 GWh |
| #373 | Holcombe | Holcombe, WI | 81.0 GWh |
| #374 | Blue Lake Hydro | Sitka, AK | 80.9 GWh |
| #375 | Kings River PH | Balch Camp, CA | 80.8 GWh |
| #376 | El Dorado | Pollock Pines, CA | 80.5 GWh |
| #377 | Five Falls | Colton, NY | 80.1 GWh |
| #378 | St Croix Falls | St Croix Falls, WI | 80.0 GWh |
| #379 | Pardee | Valley Springs, CA | 79.6 GWh |
| #380 | Allegheny Hydro No 8 | Adrian, PA | 79.6 GWh |
| #382 | Stark | Colton, NY | 78.8 GWh |
| #383 | Upper Mechanicville | Town of Stillwater, NY | 78.7 GWh |
| #384 | Loon Lake | Fresh Pond, CA | 78.0 GWh |
| #385 | Swan Lake | Ketchikan, AK | 77.6 GWh |
| #386 | River Mill | Estacada, OR | 77.3 GWh |
| #387 | Skelton | Dayton, ME | 77.2 GWh |
| #388 | Fishing Creek | Great Falls, SC | 76.8 GWh |
| #389 | Roosevelt | Roosevelt, AZ | 76.0 GWh |
| #390 | Madison Dam | Ennis, MT | 75.6 GWh |
| #391 | Drop 4 | Holtville, CA | 74.9 GWh |
Nearby Power Plants
Below are closest 20 power plants surrounding Grandfather Falls.
| Plant Name | Plant Location | Annual Generation | Distance |
|---|---|---|---|
| Alexander | Merrill, WI | 13.9 GWh | 8.1 mi |
| Antigo Solar Partners, LLC | Antigo, WI | 9.0 GWh | 32 mi |
| Antigo-Forrest Street Solar Project | Antigo, WI | 9.0 GWh | 32.4 mi |
| Domtar Paper Company Rothschild | Rothschild, WI | 524.0 MWh | 29.8 mi |
| Fiber Recovery, Inc. | Ringle, WI | 6.5 GWh | 34.8 mi |
| Flambeau Solar Partners | Phillips, WI | 4.4 GWh | 44.5 mi |
| Hat Rapids | Rhinelander, WI | 6.6 GWh | 23.9 mi |
| Hodag Solar | Rhinelander, WI | 13.2 GWh | 27.3 mi |
| Medford DPC Solar | Medford, WI | 2.8 GWh | 29.9 mi |
| Merrill | Merrill, WI | 3.7 GWh | 10 mi |
| Mosinee Mill | Mosinee, WI | 101.2 GWh | 35.8 mi |
| Ogema | Ogema, WI | 2.5 GWh | 27.9 mi |
| Packaging of America Tomahawk Mill | Tomahawk, WI | 113.1 GWh | 10.1 mi |
| Popple Creek (Clark 1) | Colby, WI | 3.7 GWh | 42.4 mi |
| Rhinelander Mill | Rhinelander, WI | 7.3 GWh | 29.4 mi |
| Rothschild Biomass Cogen Facility | Rothschild, WI | 165.6 GWh | 29.7 mi |
| Tomahawk | Tomahawk, WI | 10.7 GWh | 10.1 mi |
| Wausau | Wausau, WI | 24.5 GWh | 25 mi |
| Weston | Rothschild, WI | 4.1 TWh | 31.2 mi |
| Weston RICE | Kronenwetter, WI | 144.5 GWh | 31.5 mi |