Ocotillo
Maricopa County, Arizona · EIA plant ID 116 · Operator: Arizona Public Service Co
Nameplate806MWSummer 615 MW
Generators7in service
Net generation563GWh12 mo to Aug 2026
Capacity factor10%gas/coal/oil units, summer MW
Heat rate9,407Btu/kWhfossil units, electric fuel, HHV
First online1972Runs as peaking
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 996.9 | — | — |
| 2002 | 295.4 | — | — |
| 2003 | 188.7 | 6.7% | 12,893 |
| 2004 | 259.2 | 9.2% | 12,482 |
| 2005 | 153.9 | 5.2% | 12,434 |
| 2006 | 146.1 | 5.0% | 11,891 |
| 2007 | 178.4 | 6.3% | 12,070 |
| 2008 | 69.3 | 2.5% | 13,235 |
| 2009 | 81.5 | 2.9% | 11,887 |
| 2010 | 55.8 | 2.0% | 12,167 |
| 2011 | 91.9 | 3.3% | 11,846 |
| 2012 | 74.7 | 2.6% | 12,661 |
| 2013 | 118.7 | 4.2% | 12,660 |
| 2014 | 76.3 | 2.7% | 12,403 |
| 2015 | 107.2 | 3.8% | 11,990 |
| 2016 | 136.7 | 4.8% | 12,011 |
| 2017 | 220.1 | 7.8% | 12,395 |
| 2018 | 270.8 | 9.7% | 12,175 |
| 2019 | 618.7 | 14.5% | 10,240 |
| 2020 | 740.9 | 13.5% | 9,948 |
| 2021 | 668.4 | 12.2% | 9,904 |
| 2022 | 772.5 | 14.1% | 9,679 |
| 2023 | 640.9 | 12.1% | 9,763 |
| 2024 | 539.9 | 10.0% | 9,555 |
| 2025 | 443.3 | 8.2% | 9,491 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GT1 | Natural Gas Fired Combustion Turbine | GT | 53.1 | 50 | May 1972 | Operating | — | coming soon |
| GT2 | Natural Gas Fired Combustion Turbine | GT | 53.1 | 50 | Jul 1973 | Operating | — | coming soon |
| GT3 | Natural Gas Fired Combustion Turbine | GT | 140 | 104 | Apr 2019 | Operating | — | coming soon |
| GT4 | Natural Gas Fired Combustion Turbine | GT | 140 | 102 | Apr 2019 | Operating | — | coming soon |
| GT5 | Natural Gas Fired Combustion Turbine | GT | 140 | 104 | May 2019 | Operating | — | coming soon |
| GT6 | Natural Gas Fired Combustion Turbine | GT | 140 | 101 | Apr 2019 | Operating | — | coming soon |
| GT7 | Natural Gas Fired Combustion Turbine | GT | 140 | 104 | Apr 2019 | Operating | — | coming soon |
| 1 | Natural Gas Steam Turbine | ST | 113.6 | 110 | Jun 1960 | Retired Jan 2019 | — | coming soon |
| 2 | Natural Gas Steam Turbine | ST | 113.6 | 110 | Mar 1960 | Retired Jan 2019 | — | coming soon |
| PV1 | Solar Photovoltaic | PV | 0.1 | 0.1 | Mar 1998 | Retired Jul 2015 | — | coming soon |
| PV2 | Solar Photovoltaic | PV | 0.1 | 0.1 | Oct 1999 | Retired Jul 2015 | — | coming soon |
| PVM | Solar Photovoltaic | PV | 0.4 | 0.4 | Apr 1988 | Retired Jul 2015 | — | coming soon |
Owner / operator
Operator: Arizona Public Service Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Arizona Public Service Co | 100.0% | 806 MW |
Nearby plants
Within 80 km.
| AZ State University - Tempe Campus Solar | 3 MW | 1.5 km |
| Arizona State University CHP | 17 MW | 1.6 km |
| Crosscut | 3 MW | 3.7 km |
| AES ES GILBERT | 10 MW | 4.9 km |
| Phoenix Airport East Economy Lot | 1 MW | 6.8 km |
| Kyrene | 596 MW | 7.7 km |