Spirit Mound
Other power plant · Clay County, South Dakota
Nameplate capacity
135 MW
Rank in South Dakota
#22
of 54 plants
In service since
1978
June 1978
Details
- Primary fuel
- Other
- Technology
- Petroleum Liquids
- Operator
- Basin Electric Power Coop
- County
- Clay County
- Generating units
- 2
- Share of state capacity
- 1.76%
- Rank among other plants in South Dakota
- #1 of 9
- EIA plant code
- 6092
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Petroleum Liquids | 68 MW | 50 MW | 1978 | Operating |
| 2 | Petroleum Liquids | 68 MW | 45 MW | 1978 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in South Dakota
| Tatanka Ridge | Wind | 154 MW |
| Dakota Range III Wind Project | Wind | 154 MW |
| Wild Springs | Solar | 128 MW |
| Aberdeen CT | Natural gas | 111 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 135 MW solar plant and a 135 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All South Dakota power plants · What South Dakota actually generates