- Combustion
- Storage
- Loads
- In development
- Under construction
- Operating
- Size not stated
- 10 · 100 · 1,000 MW
Map
- Combustion
- Storage
- Loads
- In development
- Under construction
- Operating
- Size not stated
West Phoenix: location and 21 exact-grade projects within 15 mi. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
West Phoenix
Power plant · Gas, combined cycle
Key facts
Power plant · Gas, combined cycleran 40% of 2025 Operating- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1972
- Net generation, 2025
- 4,277,340 MWh
- Grid
- 230 kV to Arizona Public Service Co (AZPS)
- Location
- Maricopa County, Arizona
- Operated by
- Arizona Public Service Co
Output
- Gas
- Oil
Details
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- Technology
- Gas, combined cycle source: “Natural Gas Fired Combined Cycle”
- Age
- 54 years since 1972
- Unused energy
- 6,300 GWh 2025Unused energyA lead, not a guarantee: MW × hours × (1 − capacity factor) for the latest year (EIA-923), gas, coal and oil plants only. Air-permit run-hour caps, heat rate (cost to run) and capacity-market or reliability obligations can rule it out.
- Heat rate
- 8,360 Btu/kWh 2025
All 6 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory
| Attribute | Value |
|---|---|
| EPA greenhouse gas reporting (GHGRP) |
|
| Fuel burned (MMBtu), 2025 | 35,758,681 |
| Capacity factor, 2025 | 0.404 |
| Heat rate (Btu/kWh), 2025 | 8,360 |
| Net generation (MWh), 2025 | 4,277,340 |
| Balancing authority code | AZPS |
Retirement
EIA-860M September 2026StatusSome generators have retired; the rest of the plant is still in service. As of EIA-860M for September 2026.- Capacity retired
- 119.5 MW
- Generators retired
- 3
- Capacity still in service
- 1,207.4 MW
| Generator | Technology | Nameplate | State | Date |
|---|---|---|---|---|
| 4 | Natural Gas Steam Turbine | 34.5 MW | Retired | December 2002 |
| 5 | Natural Gas Steam Turbine | 16 MW | Retired | December 2002 |
| 6 | Natural Gas Steam Turbine | 69 MW | Retired | December 2002 |
Grid
EIA-860 2025Grid fieldsAs the plant reported them to EIA-860 for 2025 (Schedule 2).- Grid voltage at the plant
- 230 kV
- Transmission or distribution system owner
- Arizona Public Service Co
- Balancing authority
- Arizona Public Service Company
- NERC region
- WECC
Transmission lines within 15 mi (10)
Can the connection be reused?
A plant that retires usually leaves its substation, transmission connection and interconnection agreement behind, and those may be reusable by a new project at the same site. FERC Order No. 845 lets an interconnection customer use surplus interconnection service at an existing site, and some transmission providers' tariffs let a replacement resource take over a retiring unit's interconnection service, usually within a set time after the retirement. Whether any such right still exists here, who holds it and on what terms depends on the owner, the transmission provider and timing; this page does not establish any of that.
Ownership
2 companies2| Company | Role | Share | As of | Source |
|---|---|---|---|---|
| Arizona Public Service Co | Operator | EIA-860M | ||
| PINNACLE WEST CAPITAL CORP | Owner | 100.0% | Dec 31, 2023 | EPA GHGRP |
Timeline
- Stated Units 4, 5, 6 scheduled to retire, 119.5 MW · EIA-860M
- In service · EIA-860M
Sources
5 sourcesSources EIA-860M · LBNL · EIA · EIA-860M Preliminary Monthly Electric Generator Inventory · EPA Greenhouse Gas Reporting Program — facility register with parent-company shares (Envirofacts pub_dim_facility; FLIGHT)
Sources
- EIA-860M
- LBNLYin, Nait Belaid & Heleno (2026), Lawrence Berkeley National Laboratory, OEDI, CC BY 4.0: A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024. Modified by Inframation: HIFLD-side fields only, names re-cased, coordinates rounded.
- EIASource: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
- EIA-860M Preliminary Monthly Electric Generator Inventory
- EPA Greenhouse Gas Reporting Program — facility register with parent-company shares (Envirofacts pub_dim_facility; FLIGHT)
Around this plant
Nearby
within 15 mi| Project | Kind | Away | MW |
|---|---|---|---|
| Sierra Luna Energy Storage Announced | Storage | 8.7 mi | 150 |
| Prime Data Center Under construction | Large load | 8.9 mi | |
| Stack Data Center Filed | Large load | 9.2 mi | |
| QTS 40th Street Filed | Large load | 9.2 mi | |
| MCDOWELL ROAD DATA CENTER Built | Large load | 9.4 mi | |
| White Tank Energy Storage Under construction | Storage | 10.0 mi | 100 |
| PHOENIX DATA CENTER Built | Large load | 10.4 mi | |
| Iron Mountain Data Center Under construction | Large load | 10.5 mi | |
| AMERICAN AIRLINES - PHX DATA CENTER BLDG 1920 Under construction | Large load | 11.0 mi | |
| Crane (Avondale data centre) Filed | Large load | 11.5 mi | |
| Stream Data Center Built | Large load | 11.8 mi | |
| PHX16 Data Center Filed | Large load | 12.2 mi | |
| Vantage AZ15 Under construction | Large load | 12.3 mi | |
| Vantage Data Center 21 Under construction | Large load | 12.4 mi | |
| COMPASS DATACENTERS PHX I Built | Large load | 12.5 mi | |
| COMPASS DATA CENTER - MOONRAKER Built | Large load | 12.6 mi | |
| Microsoft Phx 83 (El Mirage data centre) Filed | Large load | 13.3 mi | |
| MICROSOFT CORP - OLIVE AVE Built | Large load | 13.4 mi | |
| Compass Datacenter Under construction | Large load | 13.6 mi | |
| Thistle Data Center Crane Filed | Large load | 13.9 mi | |
| PHX01 / PHX02 / PHX03 / PHX05 Built | Large load | 15.0 mi |
Sources EIA-860M · FAA OE/AAA · EPA ICIS-NPDES · EPA ICIS-Air