West Phoenix
Natural gas power plant in Maricopa County, Arizona. 1,207.4 MW of nameplate capacity across 10 generators, operated by Arizona Public Service Co.
Also known as West Phoenix Power Plant · EIA plant 117
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Key facts
- Capacity
- 1,207.4 MWNameplate
- Generators
- 10 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, AZ33.4417, −112.1583
- EIA plant ID
- 117EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power West Phoenix produces
Free · EIA-923Net generation, 2025
4.28 TWh
4,277,340 MWh, final
Capacity factor, 2025
40.4%
2024: Not reported
January to July 2026
1.50 TWh
Provisional. 6 of 7 months reported
Range, 2016 to 2025
2.3–4.3
TWh a year. Low 2022, high 2025
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 1,222,362 | Not reported | 12 of 12 |
| 2001 | 1,317,775 | Not reported | 12 of 12 |
| 2002 | 894,379 | Not reported | 12 of 12 |
| 2003 | 625,666 | Not reported | 10 of 12 |
| 2004 | 1,421,546 | Not reported | 12 of 12 |
| 2005 | 2,299,621 | Not reported | 12 of 12 |
| 2006 | 2,057,981 | Not reported | 12 of 12 |
| 2007 | 2,042,514 | Not reported | 12 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | 1,521,173 | Not reported | 12 of 12 |
| 2010 | 1,719,691 | 16.3% | 12 of 12 |
| 2011 | 1,703,197 | 16.1% | 12 of 12 |
| 2012 | 2,271,202 | Not reported | 12 of 12 |
| 2013 | 1,711,635 | Not reported | 12 of 12 |
| 2014 | 1,372,909 | 19.3% | 8 of 12 |
| 2015 | 1,740,858 | 18.0% | 11 of 12 |
| 2016 | 2,570,029 | 24.2% | 12 of 12 |
| 2017 | 2,725,192 | 25.8% | 12 of 12 |
| 2018 | 324,514 | 37.3% | 1 of 12 |
| 2019 | Not reported | Not reported | 0 of 12 |
| 2020 | 3,604,513 | 34.0% | 12 of 12 |
| 2021 | 2,856,546 | 27.0% | 12 of 12 |
| 2022 | 2,316,552 | 21.9% | 12 of 12 |
| 2023 | 3,053,387 | Not reported | 12 of 12 |
| 2024 | Not reported | Not reported | 0 of 12 |
| 2025 | 4,277,340 | 40.4% | 12 of 12 |
| 2026 (provisional, partial year) | 1,496,395 | 28.4% | 6 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
1.51M
US short tons. 2024: 1.02M
SO₂, 2025
8
US short tons
NOx, 2025
198
US short tons
CO₂ per MWh, calculated
0.35 t
About 705 lb per MWh
3 of 3 EPA units reported CO₂ in 2025 (CC4, CC5A, CC5B), matched to EIA plant 117 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, USGSWithdrawal, 2024
1,331
million gallons
Consumption, 2024
1,331
million gallons
Source
Wells
Ground, Fresh. Induced-draft tower
Watershed stress
Low · 0.288
USGS SUI, HUC12 Town of Santa Maria-Salt River
36 of 36 cooling months report withdrawal. Groundwater user; SUI describes surface water and is context only. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1B | Natural Gas Fired Combined Cycle | 132.0 | June 1976 |
| 2B | Natural Gas Fired Combined Cycle | 132.0 | June 1976 |
| 3B | Natural Gas Fired Combined Cycle | 132.0 | June 1976 |
| C4-1 | Natural Gas Fired Combined Cycle | 91.0 | June 2001 |
| C4-2 | Natural Gas Fired Combined Cycle | 44.6 | June 2001 |
| C5-1 | Natural Gas Fired Combined Cycle | 184.5 | August 2003 |
| C5-2 | Natural Gas Fired Combined Cycle | 184.5 | August 2003 |
| C5-3 | Natural Gas Fired Combined Cycle | 200.6 | August 2003 |
| GT1 | Natural Gas Fired Combustion Turbine | 53.1 | May 1972 |
| GT2 | Natural Gas Fired Combustion Turbine | 53.1 | July 1973 |
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 West Phoenix
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Questions about West Phoenix
How much power does West Phoenix produce?
West Phoenix reported 4,277,340 MWh (4.28 TWh) of net generation in 2025, a 40.4% capacity factor on 1,207.4 MW of nameplate capacity. From January to July 2026 it reported 1.50 TWh, which is provisional.
Where is West Phoenix?
West Phoenix is in Maricopa County, Arizona, at 33.4417, −112.1583. It is in the Arizona Public Service Company balancing area (AZPS).
Who operates West Phoenix?
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 West Phoenix 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
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page