Clark (SD)
Clark County, South Dakota · EIA plant ID 3341 · Operator: NorthWestern Energy - (SD)
Nameplate3MWSummer 3 MW
Generators1in service
Net generation-0GWh12 mo to Dec 2025
Capacity factor-1%!gas/coal/oil units, summer MW
Heat rate—thermal plants only
First online1970Runs as rarely runs
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), gas/coal/oil 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) |
|---|---|---|---|
| 2002 | -0 | -0.1% | — |
| 2003 | -0.1 | -0.3% | — |
| 2004 | -0.1 | -0.3% | — |
| 2005 | 0 | 0.1% | — |
| 2006 | 0 | 0.2% | — |
| 2007 | 0 | 0.1% | — |
| 2008 | 0 | 0.0% | — |
| 2009 | -0.1 | -0.3% | — |
| 2010 | -0.1 | -0.6% | — |
| 2011 | -0.1 | -0.3% | — |
| 2012 | -0.1 | -0.3% | — |
| 2013 | -0.1 | -0.3% | — |
| 2014 | -0.1 | -0.3% | — |
| 2015 | -0.1 | -0.5% | — |
| 2016 | -0.1 | -0.3% | — |
| 2017 | -0.1 | -0.5% | — |
| 2018 | -0.1 | -0.5% | — |
| 2019 | -0.1 | -0.5% | — |
| 2020 | -0.1 | -0.5% | — |
| 2021 | -0 | -0.2% | — |
| 2022 | -0.1 | -0.5% | — |
| 2023 | -0.1 | -0.5% | — |
| 2024 | -0.1 | -0.5% | — |
| 2025 | -0.1 | -0.6% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Petroleum Liquids | IC | 2.7 | 2.6 | Jan 1970 | Operating (Standby / backup) | — | coming soon |
Owner / operator
Operator: NorthWestern Energy - (SD). Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| NorthWestern Energy - (SD) | 100.0% | 3 MW |
Nearby plants
Within 80 km.
| Oak Tree Energy | 20 MW | 6.4 km |
| Crocker Wind Farm | 200 MW | 20.8 km |
| Day County Wind LLC | 99 MW | 40 km |
| Watertown Power Plant | 68 MW | 49.2 km |
| RE Solar, LLC | 8 MW | 60.9 km |
| Groton Generating Station | 216 MW | 62.3 km |