Spearfish Hydro
Lawrence County, South Dakota · EIA plant ID 58438 · Operator: City of Spearfish
Nameplate4MWSummer 4 MW
Generators2in service
Net generation18GWh12 mo to Dec 2025
Capacity factor53%hydro units, summer MW
Heat rate—thermal plants only
First online1912
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) |
|---|---|---|---|
| 2013 | 0 | 0.0% | — |
| 2014 | 3 | 8.7% | — |
| 2015 | 3.2 | 9.0% | — |
| 2016 | 2.2 | 6.2% | — |
| 2017 | 1.7 | 4.8% | — |
| 2018 | 2.1 | 6.1% | — |
| 2019 | 3.2 | 9.0% | — |
| 2020 | 3.2 | 9.0% | — |
| 2021 | 3.2 | 9.0% | — |
| 2022 | 2 | 5.8% | — |
| 2023 | 21.4 | 61.1% | — |
| 2024 | 19.9 | 56.7% | — |
| 2025 | 18.4 | 52.5% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| TURB1 | Conventional Hydroelectric | HY | 2 | 2 | Oct 1912 | Operating | — | coming soon |
| TURB2 | Conventional Hydroelectric | HY | 2 | 2 | Oct 1912 | Operating | — | coming soon |
Owner / operator
Operator: City of Spearfish. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| City of Spearfish | 100.0% | 4 MW |
Nearby plants
Within 80 km.
| Lange Gas Turbines | 40 MW | 63.3 km |
| Willow Creek Wind Power LLC | 105 MW | 64.2 km |
| Ben French | 110 MW | 64.2 km |