Groton Generating Station
Brown County, South Dakota · EIA plant ID 56238 · Operator: Basin Electric Power Coop
Nameplate216MWSummer 170 MW
Generators2in service
Net generation221GWh12 mo to Dec 2025
Capacity factor15%gas/coal/oil units, summer MW
Heat rate9,525Btu/kWhfossil units, electric fuel, HHV
First online2006Runs 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) |
|---|---|---|---|
| 2006 | 28.2 | 6.7% | 9,479 |
| 2007 | 78 | 9.7% | 9,275 |
| 2008 | 89.2 | 7.8% | 9,433 |
| 2009 | 50.1 | 3.4% | 9,393 |
| 2010 | 44.7 | 3.0% | 9,540 |
| 2011 | 70.6 | 5.3% | 10,890 |
| 2012 | 55.3 | 4.0% | 9,585 |
| 2013 | 0.1 | 0.0% | 9,024 |
| 2014 | 66.1 | 4.8% | 9,402 |
| 2015 | 44.9 | 3.2% | 9,646 |
| 2016 | 102.6 | 7.3% | 11,426 |
| 2017 | 4.4 | 0.3% | — |
| 2018 | 122.1 | 8.8% | 9,824 |
| 2019 | 119.4 | 8.1% | 10,006 |
| 2020 | 118.1 | 8.0% | 10,120 |
| 2021 | 180.7 | 12.1% | 10,176 |
| 2022 | 159.7 | 10.7% | 11,265 |
| 2023 | 201.9 | 13.6% | 10,609 |
| 2024 | 180.5 | 12.1% | 9,644 |
| 2025 | 220.7 | 14.8% | 9,525 |
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 |
|---|---|---|---|---|---|---|---|---|
| GT01 | Natural Gas Fired Combustion Turbine | GT | 108.2 | 85 | Jul 2006 | Operating | — | coming soon |
| GT02 | Natural Gas Fired Combustion Turbine | GT | 108.2 | 85 | Jul 2008 | Operating | — | coming soon |
Owner / operator
Operator: Basin Electric Power Coop. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Basin Electric Power Coop | 100.0% | 216 MW |
Nearby plants
Within 80 km.
| Day County Wind LLC | 99 MW | 23.2 km |
| Aberdeen CT | 111 MW | 31.5 km |
| Crocker Wind Farm | 200 MW | 41.7 km |
| Oak Tree Energy | 20 MW | 56.4 km |
| RE Solar, LLC | 8 MW | 59.2 km |
| Clark (SD) | 3 MW | 62.3 km |