OTAY MESA GENERATING PROJECT
OperatingNatural Gas power plant
- Capacity
- 689 MW
- Primary fuel
- Natural Gas
- County
- San Diego County
- Operator
- OTAY MESA ENERGY CENTER LLC
- Status
- Operating
- Commissioned
- 2009
- EIA plant ID
- 55345
- Generators
- 3
- Technology
- Natural Gas Fired Combined Cycle
- Net generation (2024)
- 2,350 GWh
- Capacity factor (2024, EIA nameplate)
- 38%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 32.5815, -116.9150
OTAY MESA GENERATING PROJECT, a 689 MW Natural Gas power plant in San Diego County, California. Operated by OTAY MESA ENERGY CENTER LLC, commissioned 2009.
How OTAY MESA GENERATING PROJECT compares
With 689 MW of capacity, OTAY MESA GENERATING PROJECT ranks 20th among the 874 operating power plants Bywatts maps in California and 14th of the 190 operating Natural Gas plants in the state. It accounts for about 1.9% of California's operating Natural Gas capacity and 1.0% of all operating capacity in the state. Nationally it is the 199th-largest of the 1,185 operating Natural Gas plants in the database. Commissioned in 2009, it is newer than 54% of the 859 operating California plants with a recorded commissioning year. It shares San Diego County with 36 other operating plants, including CARLSBAD ENERGY CENTER and PALOMAR ENERGY.
EIA-860 lists 3 generators at the site with 711 MW of nameplate capacity, all natural gas fired combined cycle technology. Net generation was 2,350 GWh in 2024 (a 38% capacity factor), down 9% from 2022.
Grid neighborhood
The nearest named substation is OTAY MESA (230 kV), about 0.6 miles away; the closest transmission line found within 10 miles is a 230 kV line owned by SAN DIEGO GAS & ELECTRIC, under 0.1 miles away. Another 12 operating power plants totaling 657 MW sit within 25 miles; the largest is PIO PICO ENERGY CENTER (300 MW). Within 50 miles are 4 mapped data centers; the nearest is LightEdge San Diego 1 (SAN1) in San Diego, about 21.1 miles away.
Computed by Bywatts from HIFLD power plant, substation and transmission line records, EIA-860/923 survey data and PeeringDB data center locations; distances are straight-line. Sources and methodology
Weather peril exposure
OTAY MESA GENERATING PROJECT is a 689 MW natural gas power plant in San Diego County, CA, operated by OTAY MESA ENERGY CENTER LLC, commissioned in 2009. San Diego County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.3 of 5 at the 33rd national percentile. Wildfire is the leading peril, rated Very High by FEMA at the 100th 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.
San Diego County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Wildfire | Very High | 100th | 5.0 of 5 | 0.03 |
| Earthquake | Relatively High | 94th | 4.8 of 5 | 0.11 |
| Heat wave | Relatively High | 72nd | 3.9 of 5 | 10.3 |
| Riverine flooding | Very High | 68th | 3.7 of 5 | 7.9 |
| Coastal flooding | Relatively Moderate | 40th | 2.6 of 5 | 1.6 |
| Hail | Relatively Moderate | 12th | 1.5 of 5 | 0.10 |
| Tornado | Relatively Low | 8th | 1.3 of 5 | 0.31 |
| Strong wind | Relatively Moderate | 2nd | 1.1 of 5 | 0.19 |
| Winter weather | Relatively Low | 1st | 1.0 of 5 | 3.7 |
| Lightning | Relatively Moderate | 0th | 1.0 of 5 | 11.1 |
| Hurricane | Very Low | 0th | 1.0 of 5 | 0.01 |
Perils not assessed in San Diego 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 |
|---|---|
| Ice storm | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for San Diego 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.