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1207.4 MW Natural Gas Fired Combined Cycle (1101 MW) + Natural Gas Fired Combustion Turbine (106 MW) operating in Maricopa, AZ
1,207.4 MW
Nameplate Capacity
10
Generators
units
Hybrid (2)
Technology
Natural Gas Fired Combined Cycle + Natural Gas Fired Combustion Turbine
1972
Operating Since
Coordinates
33.4417, -112.1583
County
Maricopa, AZ
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Arizona Public Service Co | Arizona Public Service | — |
| Owner(s) | Arizona Public Service Co | Pinnacle West Capital | — |
| Status | Operating | — | — |
The West Phoenix plant is a 1207.4 MW natural gas-fired power plant located in Maricopa County, Arizona. It began operating in 1972 and consists of 10 generators utilizing both natural gas-fired combined cycle and natural gas-fired combustion turbine technologies. The plant is owned by Pinnacle West Capital and operated by Arizona Public Service Company (APS). It is considered a hybrid plant.
West Phoenix operates within the Arizona Public Service Company balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. The plant's latest annual generation was 4,277,340 MWh, achieving a capacity factor of 40.4%. West Phoenix ranks as the 3rd largest power plant out of 26 in Arizona, and 113th out of 945 nationally.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Arizona Public Service Company (AZPS)
Grid Voltage
230.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
373.6K MWh
Latest Month
4.3M MWh
Annual Generation
40.4%
Capacity Factor
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CO₂ Intensity
635 lb/MWh
NOx
0.087 lb/MWh
SO₂
0.003 lb/MWh
CH₄
0.019 lb/MWh
N₂O
0.002 lb/MWh
Capacity Factor
28.9%
Annual Net Gen
3053 GWh
CO₂eq
636 lb/MWh
Subregion
WECC Southwest
2013
$965/kW
Est. Construction Cost
Total estimated cost: $1.2B
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This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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