Ocotillo
Natural gas power plant in Maricopa County, Arizona. 806.2 MW of nameplate capacity across 7 generators, operated by Arizona Public Service Co.
Also known as APS Ocotillo Power Plant · EIA plant 116
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Key facts
- Capacity
- 806.2 MWNameplate
- Generators
- 7 operatingEIA-860M, August 2026
- Operating since
- May 1972First generator online
- Operator
- Arizona Public Service CoEIA operator ID 803
- Grid
- AZPSBalancing authority AZPS
- Price nodes
- None linkedNo verified ISO node
- Location
- Maricopa County, AZ33.4225, −111.9122
- EIA plant ID
- 116EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Ocotillo produces
Free · EIA-923Net generation, 2025
443 GWh
443,322 MWh, final
Capacity factor, 2025
6.3%
2024: Not reported
January to July 2026
343 GWh
Provisional
Range, 2017 to 2025
220.1–772.5
GWh a year. Low 2017, high 2022
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 749,070 | Not reported | 12 of 12 |
| 2001 | 996,900 | Not reported | 12 of 12 |
| 2002 | 295,374 | Not reported | 12 of 12 |
| 2003 | 186,560 | Not reported | 10 of 12 |
| 2004 | 259,190 | Not reported | 12 of 12 |
| 2005 | 153,917 | Not reported | 12 of 12 |
| 2006 | 146,063 | Not reported | 12 of 12 |
| 2007 | 178,375 | Not reported | 12 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | 81,461 | Not reported | 12 of 12 |
| 2010 | 55,777 | 1.9% | 12 of 12 |
| 2011 | 91,878 | 3.1% | 12 of 12 |
| 2012 | 74,684 | 2.5% | 12 of 12 |
| 2013 | 118,705 | 4.1% | 12 of 12 |
| 2014 | 66,387 | 3.4% | 8 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | 2,338 | 0.9% | 1 of 12 |
| 2017 | 220,097 | 7.5% | 12 of 12 |
| 2018 | 270,760 | 9.3% | 12 of 12 |
| 2019 | 9,397 | Not reported | 2 of 12 |
| 2020 | 740,914 | 9.2% | 12 of 12 |
| 2021 | 668,400 | 8.3% | 12 of 12 |
| 2022 | 772,545 | Not reported | 12 of 12 |
| 2023 | 640,869 | Not reported | 12 of 12 |
| 2024 | 539,884 | Not reported | 12 of 12 |
| 2025 | 443,322 | 6.3% | 12 of 12 |
| 2026 (provisional, partial year) | 342,531 | 8.4% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDCO₂, 2025
241,948
US short tons. 2024: 282,941
SO₂, 2025
1
US short tons
NOx, 2025
17
US short tons
CO₂ per MWh, calculated
0.55 t
About 1,092 lb per MWh
5 of 5 EPA units reported CO₂ in 2025 (1, 2, GT3, GT4, GT5, GT6, GT7), matched to EIA plant 116 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GT1 | Natural Gas Fired Combustion Turbine | 53.1 | May 1972 |
| GT2 | Natural Gas Fired Combustion Turbine | 53.1 | July 1973 |
| GT3 | Natural Gas Fired Combustion Turbine | 140.0 | April 2019 |
| GT4 | Natural Gas Fired Combustion Turbine | 140.0 | April 2019 |
| GT5 | Natural Gas Fired Combustion Turbine | 140.0 | May 2019 |
| GT6 | Natural Gas Fired Combustion Turbine | 140.0 | April 2019 |
| GT7 | Natural Gas Fired Combustion Turbine | 140.0 | April 2019 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Arizona Public Service Co as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near Ocotillo
More plants operated by Arizona Public Service Co
Questions about Ocotillo
How much power does Ocotillo produce?
Ocotillo reported 443,322 MWh (443 GWh) of net generation in 2025, a 6.3% capacity factor on 806.2 MW of nameplate capacity. From January to July 2026 it reported 343 GWh, which is provisional.
Where is Ocotillo?
Ocotillo is in Maricopa County, Arizona, at 33.4225, −111.9122. It is in the Arizona Public Service Company balancing area (AZPS).
Who operates Ocotillo?
EIA-860M for August 2026 lists Arizona Public Service Co as the operator (EIA operator ID 803). The operator is not always the owner.
When did Ocotillo start operating?
Its first generator began operating in May 1972, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page