ANGUS ANSON
OperatingNatural Gas power plant
- Capacity
- 406 MW
- Primary fuel
- Natural Gas
- County
- Minnehaha County
- Operator
- NORTHERN STATES POWER CO - MINNESOTA
- Status
- Operating
- Commissioned
- 1994
- EIA plant ID
- 7237
- Generators
- 3
- Technology
- Natural Gas Fired Combustion Turbine
- Net generation (2024)
- 237 GWh
- Capacity factor (2024, EIA nameplate)
- 6.7%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 43.6033, -96.6375
ANGUS ANSON, a 406 MW Natural Gas power plant in Minnehaha County, South Dakota. Operated by NORTHERN STATES POWER CO - MINNESOTA, commissioned 1994.
How ANGUS ANSON compares
With 406 MW of capacity, ANGUS ANSON ranks 4th among the 28 operating power plants Bywatts maps in South Dakota and is the largest of the 3 operating Natural Gas plants in the state. It accounts for about 64% of South Dakota's operating Natural Gas capacity and 9.6% of all operating capacity in the state. Nationally it is the 375th-largest of the 1,185 operating Natural Gas plants in the database. Commissioned in 1994, it is newer than 50% of the 26 operating South Dakota plants with a recorded commissioning year.
EIA-860 lists 3 generators at the site with 406 MW of nameplate capacity, all natural gas fired combustion turbine technology. Net generation was 237 GWh in 2024 (a 6.7% capacity factor). Its generators came online between 1994 and 2005.
Grid neighborhood
The closest transmission line found within 10 miles is a 115 kV line owned by NORTHERN STATES POWER CO - MINNESOTA, about 0.1 miles away. Another 3 operating power plants totaling 207 MW sit within 25 miles; the largest is PRAIRIE ROSE WIND FARM (200 MW, Wind).
Computed by Bywatts from HIFLD power plant and transmission line records and EIA-860/923 survey data; distances are straight-line. Sources and methodology
Weather peril exposure
ANGUS ANSON is a 406 MW natural gas power plant in Minnehaha County, SD, operated by NORTHERN STATES POWER CO - MINNESOTA, commissioned in 1994. Minnehaha County carries elevated modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.3 of 5 at the 57th national percentile. Winter weather is the leading peril, rated Relatively High by FEMA at the 91st percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a natural gas plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Minnehaha County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Winter weather | Relatively High | 91st | 4.6 of 5 | 17.6 |
| Tornado | Relatively High | 84th | 4.4 of 5 | 0.67 |
| Ice storm | Very High | 81st | 4.2 of 5 | 1.1 |
| Heat wave | Relatively Moderate | 77th | 4.1 of 5 | 5.6 |
| Hail | Relatively Moderate | 64th | 3.5 of 5 | 5.9 |
| Wildfire | Relatively Low | 58th | 3.3 of 5 | <0.01 |
| Riverine flooding | Relatively Moderate | 46th | 2.9 of 5 | 4.5 |
| Strong wind | Relatively High | 41st | 2.6 of 5 | 4.0 |
| Lightning | Relatively Low | 34th | 2.4 of 5 | 37.7 |
| Earthquake | Very Low | 13th | 1.5 of 5 | <0.01 |
Perils not assessed in Minnehaha County
These perils carry no usable National Risk Index figure for this county, so they are excluded from the scoring rather than scored zero. A zero would claim the peril was assessed and found benign.
| Peril | Why it is not scored |
|---|---|
| Hurricane | FEMA rating is "Not Applicable" for this county |
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Minnehaha County in the weather risk calculator
Ratings are the FEMA National Risk Index county hazard ratings; the peril score is a Bywatts transform of the FEMA national percentile. Full data sources and the solar vulnerability methodology are in the weather risk calculator.
Modeled estimate for screening and negotiation. Built from FEMA National Risk Index county hazard data and a solar vulnerability layer documented above. Not a quote, a binder, or actuarial advice, and not a substitute for a carrier's own model. Hazard data: FEMA National Risk Index December 2025, synced 2026-07-24. Resolution is county level, not site level.