Day County Wind LLC
Day County, South Dakota · EIA plant ID 57194 · Operator: Day County Wind LLC
Nameplate99MWSummer 99 MW
Generators1in service
Net generation435GWh12 mo to Aug 2026
Capacity factor50%wind units, summer MW
Heat rate—thermal plants only
First online2010
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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), wind 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) |
|---|---|---|---|
| 2010 | 297.5 | 45.5% | — |
| 2011 | 440.1 | 50.7% | — |
| 2012 | 438.8 | 50.5% | — |
| 2013 | 411.3 | 47.4% | — |
| 2014 | 439.5 | 50.7% | — |
| 2015 | 424 | 48.9% | — |
| 2016 | 446.9 | 51.4% | — |
| 2017 | 397 | 45.8% | — |
| 2018 | 396.6 | 45.7% | — |
| 2019 | 383.2 | 44.2% | — |
| 2020 | 349.5 | 40.2% | — |
| 2021 | 419.8 | 48.4% | — |
| 2022 | 444.2 | 51.2% | — |
| 2023 | 408.5 | 47.1% | — |
| 2024 | 429.1 | 49.4% | — |
| 2025 | 439.2 | 50.6% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GE15 | Onshore Wind Turbine | WT | 99 | 99 | Apr 2010 | Operating | — | ge 1.5 XLE |
Owner / operator
Operator: Day County Wind LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Day County Wind LLC | 100.0% | 99 MW |
Nearby plants
Within 80 km.
| Crocker Wind Farm | 200 MW | 19.2 km |
| Groton Generating Station | 216 MW | 23.2 km |
| Oak Tree Energy | 20 MW | 33.9 km |
| Clark (SD) | 3 MW | 40 km |
| Aberdeen CT | 111 MW | 51.8 km |
| RE Solar, LLC | 8 MW | 56.9 km |