Power plant · South Dakota, United States
Big Stone
Big Stone is a power plant in South Dakota, United States, with 451 MW of capacity, owned by Otter Tail Power Co (53.9%), NorthWestern Energy - (SD) (23.4%) and Montana-Dakota Utilities Co (22.7%).
Facts
Every value links to its source, and to the source's own record where it has one. Licences and last-checked dates are per row.
| Fact | Value | Source |
|---|---|---|
| Location | South Dakota | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Status | Operating | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Start year | 1975 | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Owner | Otter Tail Power Co (53.9%) | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Owner | NorthWestern Energy - (SD) (23.4%) | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Owner | Montana-Dakota Utilities Co (22.7%) | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Operator | Otter Tail Power Co | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Capacity | 451 MW | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Technology | Conventional Steam Coal | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Coordinates | 45.3037, -96.5101 | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
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How it compares
Big Stone is the 3rd-largest of 3 power plants in South Dakota and the 785th-largest of 800 in the United States by capacity; its 451 MW is <0.1% of the 839,036 MW we hold for the United States. Ranks and totals cover the power plants in our data that report their capacity, not every one in existence. Power plants planned, permitted or under construction are ranked apart.
| Within | Rank | Total | Share |
|---|---|---|---|
| South Dakota | 3rd of 3 | 1,775 MW | 25% |
| United States | 785th of 800 | 839,036 MW | <0.1% |
| All power plants in our data | 856th of 4,829 | 1,037,268 MW | <0.1% |
Owners, operator and place
More from Otter Tail Power Co
- Coyote450 MW
- Abercrombie Solar295 MW · planned
Other power plants in South Dakota
- Oahe786 MW
- Big Bend Dam538 MW
- Toronto Power Plant145 MW · planned
Data on this page
- Source: U.S. Energy Information Administration (Sep 2026). EIA-860 / 860M / 923, Public domain.
- Bundesnetzagentur, Marktstammdatenregister. Marktstammdatenregister, DL-DE-BY-2.0.