Headgate Rock
Hydro power plant · La Paz County, Arizona
Nameplate capacity
20 MW
Rank in Arizona
#131
of 200 plants
In service since
1993
March 1993
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Colorado River Indian Irr Proj
- County
- La Paz County
- Generating units
- 3
- Share of state capacity
- 0.05%
- Rank among hydro plants in Arizona
- #8 of 11
- EIA plant code
- 7179
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 6.5 MW | 6.5 MW | 1993 | Out of service but expected to return to service in next calendar year |
| 2 | Conventional Hydroelectric | 6.5 MW | 6.5 MW | 1993 | Out of service but expected to return to service in next calendar year |
| 3 | Conventional Hydroelectric | 6.5 MW | 6.5 MW | 1993 | Out of service but expected to return to service in next calendar year |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Arizona
| Poseidon Solar, LLC | Solar | 20 MW |
| Sulphur Springs | Solar | 20 MW |
| Queen Creek Solar Farm | Solar | 19 MW |
| Fort Huachuca Solar PV Project | Solar | 18 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 20 MW solar plant and a 20 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Arizona power plants · What Arizona actually generates