CLARENCE CANNON
OperatingHydro power plant
- Capacity
- 58 MW
- Primary fuel
- Hydro
- County
- Ralls County
- Operator
- USCE-ST LOUIS DISTRICT
- Status
- Operating
- Commissioned
- 1984
- EIA plant ID
- 6140
- Generators
- 2
- Technology
- Hydroelectric Pumped Storage
- Net generation (2024)
- 97.7 GWh
- Capacity factor (2024, EIA nameplate)
- 19%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 39.5248, -91.6441
CLARENCE CANNON, a 58 MW Hydro power plant in Ralls County, Missouri. Operated by USCE-ST LOUIS DISTRICT, commissioned 1984.
How CLARENCE CANNON compares
With 58 MW of capacity, CLARENCE CANNON ranks 39th among the 92 operating power plants Bywatts maps in Missouri and 4th of the 7 operating Hydro plants in the state. It accounts for about 8.4% of Missouri's operating Hydro capacity and 0.3% of all operating capacity in the state. Nationally it is the 261st-largest of the 1,243 operating Hydro plants in the database. Commissioned in 1984, it is newer than 57% of the 89 operating Missouri plants with a recorded commissioning year.
EIA-860 lists 2 generators at the site with 58 MW of nameplate capacity, mainly hydroelectric pumped storage technology. Net generation was 97.7 GWh in 2024 (a 19% capacity factor), down 32% from 2022.
Grid neighborhood
The nearest named substation is AUDRAIN (345 kV), about 15.9 miles away; the closest transmission line found within 10 miles is a 345 kV line owned by UNION ELECTRIC CO - (MO), about 5.0 miles away. Another 5 operating power plants totaling 843 MW sit within 25 miles; the largest is AUDRAIN GENERATING STATION (814 MW, Natural Gas).
Computed by Bywatts from HIFLD power plant, substation and transmission line records and EIA-860/923 survey data; distances are straight-line. Sources and methodology
Weather peril exposure
CLARENCE CANNON is a 58 MW hydro power plant in Ralls County, MO, operated by USCE-ST LOUIS DISTRICT, commissioned in 1984. Ralls County carries high modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.7 of 5 at the 67th national percentile. Riverine flooding is the leading peril, rated Very Low by FEMA at the 89th 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.
Ralls County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Riverine flooding | Very Low | 89th | 4.6 of 5 | 1.1 |
| Heat wave | Relatively Low | 75th | 4.0 of 5 | 9.5 |
| Hail | Relatively Low | 73rd | 3.9 of 5 | 3.9 |
| Earthquake | Very Low | 69th | 3.8 of 5 | <0.01 |
| Strong wind | Relatively Low | 68th | 3.7 of 5 | 4.0 |
| Ice storm | Very Low | 57th | 3.3 of 5 | 1.1 |
| Lightning | Very Low | 55th | 3.2 of 5 | 48.4 |
| Winter weather | Very Low | 48th | 2.9 of 5 | 9.6 |
| Wildfire | Very Low | 47th | 2.9 of 5 | <0.01 |
| Tornado | Very Low | 45th | 2.8 of 5 | 0.26 |
| Hurricane | Very Low | 12th | 1.5 of 5 | <0.01 |
Perils not assessed in Ralls 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 Ralls 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.