OSAGE
OperatingHydro power plant
- Capacity
- 208 MW
- Primary fuel
- Hydro
- County
- Miller County
- Operator
- UNION ELECTRIC CO - (MO)
- Status
- Operating
- Commissioned
- 1931
- EIA plant ID
- 2106
- Generators
- 8
- Technology
- Conventional Hydroelectric
- Net generation (2024)
- 497 GWh
- Capacity factor (2024, EIA nameplate)
- 27%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 38.2051, -92.6223
OSAGE, a 208 MW Hydro power plant in Miller County, Missouri. Operated by UNION ELECTRIC CO - (MO), commissioned 1931.
How OSAGE compares
With 208 MW of capacity, OSAGE ranks 23rd among the 92 operating power plants Bywatts maps in Missouri and is the largest of the 7 operating Hydro plants in the state. It accounts for about 30% of Missouri's operating Hydro capacity and 1.1% of all operating capacity in the state. Nationally it is the 84th-largest of the 1,243 operating Hydro plants in the database. Commissioned in 1931, it is older than 96% of the 89 operating Missouri plants with a recorded commissioning year. Its operator, UNION ELECTRIC CO - (MO), runs 11 operating plants in Missouri totaling 6,645 MW.
EIA-860 lists 8 generators at the site with 208 MW of nameplate capacity, all conventional hydroelectric technology. Net generation was 497 GWh in 2024 (a 27% capacity factor), down 8% from 2022. Its generators came online between 1931 and 1953.
Grid neighborhood
The closest transmission line found within 10 miles is a 138 kV line owned by UNION ELECTRIC CO - (MO), under 0.1 miles away. One other operating power plant sits within 25 miles: NIANGUA (3 MW, Hydro).
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
OSAGE is a 208 MW hydro power plant in Miller County, MO, operated by UNION ELECTRIC CO - (MO), commissioned in 1931. Miller County carries elevated modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.8 of 5 at the 46th national percentile. Ice storm 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 hydro plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Miller County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Ice storm | Relatively High | 91st | 4.6 of 5 | 0.78 |
| Winter weather | Relatively Moderate | 87th | 4.5 of 5 | 11.8 |
| Earthquake | Relatively Low | 76th | 4.0 of 5 | <0.01 |
| Riverine flooding | Relatively Low | 75th | 4.0 of 5 | 2.8 |
| Wildfire | Relatively Low | 69th | 3.8 of 5 | <0.01 |
| Tornado | Relatively Moderate | 58th | 3.3 of 5 | 0.31 |
| Hail | Relatively Low | 54th | 3.2 of 5 | 5.2 |
| Heat wave | Relatively Moderate | 50th | 3.0 of 5 | 12.5 |
| Lightning | Relatively Low | 39th | 2.6 of 5 | 53.3 |
| Strong wind | Relatively Low | 26th | 2.0 of 5 | 3.6 |
| Hurricane | Very Low | 25th | 2.0 of 5 | 0.01 |
Perils not assessed in Miller 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 Miller 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.