Sandstone Rapids
Marinette County, Wisconsin · EIA plant ID 4074 · Operator: Wisconsin Public Service Corp
Nameplate4MWSummer 4 MW
Generators2in service
Net generation10GWh12 mo to Dec 2025
Capacity factor29%hydro units, summer MW
Heat rate—thermal plants only
First online1925
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), hydro 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.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 9.5 | 27.2% | — |
| 2002 | 13.4 | 190.8% | — |
| 2003 | 10.5 | 150.3% | — |
| 2004 | 12.6 | 178.7% | — |
| 2005 | 9.5 | 134.9% | — |
| 2006 | 8.7 | 99.8% | — |
| 2007 | 8.1 | 70.7% | — |
| 2008 | 8.7 | 62.0% | — |
| 2009 | 6.6 | 47.3% | — |
| 2010 | 9.1 | 65.1% | — |
| 2011 | 9.3 | 66.4% | — |
| 2012 | 8.2 | 58.4% | — |
| 2013 | 10.2 | 72.7% | — |
| 2014 | 13.1 | 93.7% | — |
| 2015 | 13.4 | 153.2% | — |
| 2016 | 23.5 | 267.3% | — |
| 2017 | 18.2 | 207.9% | — |
| 2018 | 13.5 | 153.9% | — |
| 2019 | 16.6 | 49.8% | — |
| 2020 | 18 | 53.9% | — |
| 2021 | 11.2 | 33.5% | — |
| 2022 | 8 | 24.0% | — |
| 2023 | 8.2 | 24.5% | — |
| 2024 | 8.8 | 26.3% | — |
| 2025 | 9.7 | 29.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 1.9 | 1.9 | Jan 1925 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 1.9 | 1.9 | Jan 1925 | Operating | — | coming soon |
Owner / operator
Operator: Wisconsin Public Service Corp. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Wisconsin Public Service Corp | 100.0% | 4 MW |
Nearby plants
Within 80 km.
| Johnson Falls | 3 MW | 9.4 km |
| High Falls (WI) | 7 MW | 11.5 km |
| Caldron Falls | 6 MW | 18.7 km |
| Potato Rapids | 1 MW | 27.7 km |
| West Marinette 34 | 83 MW | 33.9 km |
| West Marinette | 187 MW | 33.9 km |