CHOLLA
Partly retiredCoal power plant
- Capacity
- 1,129 MW
- Primary fuel
- Coal
- County
- Navajo County
- Operator
- ARIZONA PUBLIC SERVICE CO
- EIA plant ID
- 113
- Generators
- 2
- Technology
- Conventional Steam Coal
- Net generation (2024)
- 1,321 GWh
- Capacity factor (2024, EIA nameplate)
- 35%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 34.9394, -110.3033
CHOLLA, a partly retired 1,129 MW Coal power plant in Navajo County, Arizona. Most of its capacity was retired, most recently in 2020, according to EIA-860.
How CHOLLA compares
EIA-860 lists 426 MW still operable at the site (conventional steam coal), against the 1,129 MW recorded for it. Its operator, ARIZONA PUBLIC SERVICE CO, runs 17 operating plants in Arizona totaling 8,906 MW. It shares Navajo County with 3 other operating plants, including DRY LAKE WIND II LLC and DRY LAKE WIND LLC.
EIA-860 lists 2 generators at the site with 426 MW of nameplate capacity, all conventional steam coal technology (this page's HIFLD capacity figure is 1,129 MW). Net generation was 1,321 GWh in 2024 (a 35% capacity factor), down 43% from 2022. Its generators came online between 1962 and 1980.
Grid neighborhood
The nearest named substation is CHOLLA (500 kV), about 0.1 miles away; the closest transmission line found within 10 miles is a 345 kV line owned by ARIZONA PUBLIC SERVICE COMPANY, about 0.1 miles away. Another 2 operating power plants totaling 128 MW sit within 25 miles; the largest is DRY LAKE WIND II LLC (65 MW, Wind).
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
CHOLLA is a partly retired 1,129 MW coal power plant in Navajo County, AZ, operated by ARIZONA PUBLIC SERVICE CO. Navajo County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.4 of 5 at the 9th national percentile. Wildfire is the leading peril, rated Relatively High by FEMA at the 95th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a coal plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Navajo County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Wildfire | Relatively High | 95th | 4.8 of 5 | <0.01 |
| Riverine flooding | Relatively Moderate | 62nd | 3.5 of 5 | 4.1 |
| Earthquake | Relatively Low | 61st | 3.5 of 5 | <0.01 |
| Heat wave | Relatively Low | 27th | 2.1 of 5 | 0.77 |
| Hail | Relatively Low | 17th | 1.7 of 5 | 0.11 |
| Winter weather | Very High | 13th | 1.5 of 5 | 5.8 |
| Lightning | Very High | 5th | 1.2 of 5 | 47.6 |
| Tornado | Very Low | 2nd | 1.1 of 5 | 0.39 |
| Strong wind | Relatively Low | 2nd | 1.1 of 5 | 0.06 |
| Ice storm | Relatively Moderate | 1st | 1.0 of 5 | 0.01 |
Perils not assessed in Navajo 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 |
|---|---|
| Hurricane | FEMA rating is "No Rating" for this county |
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Navajo 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.