STOCK ISLAND
OperatingOil power plant
- Capacity
- 127 MW
- Primary fuel
- Oil
- County
- Monroe County
- Operator
- UTILITY BOARD OF KEY WEST CITY
- Status
- Operating
- Commissioned
- 1978
- EIA plant ID
- 6584
- Generators
- 7
- Technology
- Petroleum Liquids
- Net generation (2024)
- 3.4 GWh
- Capacity factor (2024, EIA nameplate)
- 0.3%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 24.5632, -81.7341
STOCK ISLAND, a 127 MW Oil power plant in Monroe County, Florida. Operated by UTILITY BOARD OF KEY WEST CITY, commissioned 1978.
How STOCK ISLAND compares
With 127 MW of capacity, STOCK ISLAND ranks 52nd among the 110 operating power plants Bywatts maps in Florida and 4th of the 8 operating Oil plants in the state. It accounts for about 4.2% of Florida's operating Oil capacity and 0.2% of all operating capacity in the state. Nationally it is the 35th-largest of the 544 operating Oil plants in the database. Commissioned in 1978, it is older than 73% of the 108 operating Florida plants with a recorded commissioning year. It shares Monroe County with one other operating plant, MARATHON GENERATING PLANT.
EIA-860 lists 7 generators at the site with 127 MW of nameplate capacity, all petroleum liquids technology. Net generation was 3.4 GWh in 2024 (a 0.3% capacity factor). Its generators came online between 1978 and 2012.
Grid neighborhood
The closest transmission line found within 10 miles is a 138 kV line, under 0.1 miles away.
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
STOCK ISLAND is a 127 MW oil power plant in Monroe County, FL, operated by UTILITY BOARD OF KEY WEST CITY, commissioned in 1978. Monroe County carries critical modeled catastrophe exposure in the FEMA National Risk Index, scoring 4.5 of 5 at the 89th national percentile. Hurricane is the leading peril, rated Relatively High by FEMA at the 99th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to an oil plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Monroe County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Hurricane | Relatively High | 99th | 5.0 of 5 | 0.29 |
| Coastal flooding | Very High | 83rd | 4.3 of 5 | 2.3 |
| Wildfire | Very Low | 44th | 2.8 of 5 | <0.01 |
| Lightning | Relatively High | 39th | 2.6 of 5 | 101.3 |
| Heat wave | Relatively Low | 26th | 2.0 of 5 | 4.1 |
| Hail | Very Low | 16th | 1.6 of 5 | 0.43 |
| Tornado | Very Low | 15th | 1.6 of 5 | 1.1 |
| Strong wind | Relatively Low | 8th | 1.3 of 5 | 0.59 |
| Riverine flooding | Relatively Low | 1st | 1.0 of 5 | 0.54 |
| Earthquake | Very Low | 0th | 1.0 of 5 | <0.01 |
Perils not assessed in Monroe 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 |
|---|---|
| Winter weather | FEMA rating is "No Rating" for this county |
| Ice storm | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Monroe 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.