Aberdeen CT
Brown County, South Dakota · EIA plant ID 3338 · Operator: NorthWestern Energy - (SD)
32 MW under construction (Natural Gas Fired Combustion Turbine), first expected Oct 2026 · EIA-860M
Nameplate111MWSummer 73 MW
Generators2in service · 32 MW building
Net generation56GWh12 mo to Dec 2025
Capacity factor9%gas/coal/oil units, summer MW
Heat rate12,349Btu/kWhfossil units, electric fuel, HHV
First online1978Runs as peaking
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.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 1.3 | 0.7% | 18,142 |
| 2002 | 0.3 | 0.2% | 24,410 |
| 2003 | 0.9 | 0.5% | 16,285 |
| 2004 | 0.1 | 0.0% | — |
| 2005 | 0.2 | 0.1% | — |
| 2006 | 0.1 | 0.1% | — |
| 2007 | 0.1 | 0.1% | — |
| 2008 | 1.7 | 0.9% | 12,826 |
| 2009 | 0.9 | 0.5% | 15,926 |
| 2010 | 0.1 | 0.0% | — |
| 2011 | 0.5 | 0.3% | 17,768 |
| 2012 | 0.2 | 0.1% | 20,798 |
| 2013 | 8 | 1.5% | 14,910 |
| 2014 | 4.1 | 0.6% | 13,749 |
| 2015 | 7.8 | 1.2% | 11,604 |
| 2016 | 9.1 | 1.4% | 20,746 |
| 2017 | 10.4 | 1.6% | 11,273 |
| 2018 | 36.7 | 5.8% | 10,309 |
| 2019 | 43.9 | 6.9% | 10,595 |
| 2020 | 31.7 | 5.0% | 11,008 |
| 2021 | 51.4 | 8.1% | 11,060 |
| 2022 | 58.6 | 9.2% | 12,885 |
| 2023 | 39.6 | 6.2% | 10,708 |
| 2024 | 29.7 | 4.7% | 10,834 |
| 2025 | 56.2 | 8.8% | 12,349 |
Fuel capability
Gas-fired turbines (CT/GT/CA/CS) that can also burn liquid fuel. EIA-860 Schedule 3 for capability, EIA-923 for actual burn.
StatusLikely still dual fuel
Liquid fuel burned · 36 mo21,991 MMBtu
Last month with liquid burnDec 2024
Switch while operatingYes
Net summer MW on gas52
Net summer MW on oil50
Time gas → oilup to 1 h (EIA 1H)
Time oil → gasup to 1 h (EIA 1H)
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 |
|---|---|---|---|---|---|---|---|---|
| 2 | Natural Gas Fired Combustion Turbine | GT | 82.2 | 52 | Apr 2013 | Operating | — | coming soon |
| GT1 | Petroleum Liquids | GT | 28.8 | 20.5 | May 1978 | Operating | — | coming soon |
| 3 | Natural Gas Fired Combustion Turbine | GT | 16 | 15 | planned Oct 2026 | Under construction | — | coming soon |
| 4 | Natural Gas Fired Combustion Turbine | GT | 16 | 15 | planned Oct 2026 | Under construction | — | 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% | 111 MW |
Nearby plants
Within 80 km.
| Groton Generating Station | 216 MW | 31.5 km |
| Day County Wind LLC | 99 MW | 51.8 km |
| RE Solar, LLC | 8 MW | 56.3 km |
| Faulkton | 3 MW | 65.7 km |
| Crocker Wind Farm | 200 MW | 67.1 km |
| Tatanka Wind Power LLC | 180 MW | 68.6 km |