DEMPSEY RIDGE WIND FARM
OperatingWind power plant
- Capacity
- 132 MW
- Primary fuel
- Wind
- County
- Roger Mills County
- Operator
- ACCIONA WIND ENERGY USA LLC
- Status
- Operating
- Commissioned
- 2012
- EIA plant ID
- 56665
- Generators
- 1
- Technology
- Onshore Wind Turbine
- Net generation (2024)
- 117 GWh
- Capacity factor (2024, EIA nameplate)
- 10%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 35.5438, -99.8791
DEMPSEY RIDGE WIND FARM, a 132 MW Wind power plant in Roger Mills County, Oklahoma. Operated by ACCIONA WIND ENERGY USA LLC, commissioned 2012.
How DEMPSEY RIDGE WIND FARM compares
With 132 MW of capacity, DEMPSEY RIDGE WIND FARM ranks 34th among the 73 operating power plants Bywatts maps in Oklahoma and 9th of the 23 operating Wind plants in the state. It accounts for about 4.4% of Oklahoma's operating Wind capacity and 0.5% of all operating capacity in the state. Nationally it is the 166th-largest of the 708 operating Wind plants in the database. Commissioned in 2012, it is newer than 87% of the 72 operating Oklahoma plants with a recorded commissioning year. Its operator, ACCIONA WIND ENERGY USA LLC, runs 2 operating plants in Oklahoma totaling 255 MW. It shares Roger Mills County with 2 other operating plants, ELK CITY WIND FARM and RED HILLS WIND PROJECT LLC.
EIA-860 lists 1 generator at the site with 132 MW of nameplate capacity, all onshore wind turbine technology. Net generation was 117 GWh in 2024 (a 10% capacity factor), down 45% from 2022.
Grid neighborhood
The closest transmission line found within 10 miles is a 138 kV line owned by PUBLIC SERVICE CO OF OKLAHOMA, about 0.6 miles away. One other operating power plant sits within 25 miles: ELK CITY WIND FARM (198 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
DEMPSEY RIDGE WIND FARM is a 132 MW wind power plant in Roger Mills County, OK, operated by ACCIONA WIND ENERGY USA LLC, commissioned in 2012. Roger Mills County carries critical modeled catastrophe exposure in the FEMA National Risk Index, scoring 4.7 of 5 at the 92nd national percentile. Strong wind is the leading peril, rated Relatively Moderate by FEMA at the 100th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a wind plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Roger Mills County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Strong wind | Relatively Moderate | 100th | 5.0 of 5 | 3.5 |
| Ice storm | Relatively Moderate | 96th | 4.9 of 5 | 0.83 |
| Wildfire | Relatively Moderate | 94th | 4.7 of 5 | 0.01 |
| Hail | Relatively Low | 91st | 4.6 of 5 | 7.8 |
| Winter weather | Relatively Low | 90th | 4.6 of 5 | 9.0 |
| Heat wave | Very Low | 77th | 4.1 of 5 | 6.1 |
| Tornado | Relatively Low | 67th | 3.7 of 5 | 0.89 |
| Lightning | Very Low | 58th | 3.3 of 5 | 48.1 |
| Riverine flooding | Very Low | 53rd | 3.1 of 5 | 0.36 |
| Earthquake | Very Low | 37th | 2.5 of 5 | <0.01 |
| Hurricane | Very Low | 24th | 2.0 of 5 | <0.01 |
Perils not assessed in Roger Mills 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 |
|---|---|
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Roger Mills 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.