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619 MW Natural Gas operating in Maricopa, AZ — Salt River Project
619 MW
Nameplate Capacity
3
Generators
units
Natural Gas Fired Combined Cycle
Technology
2003
Operating Since
Coordinates
32.9750, -112.6944
County
Maricopa, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Salt River Project | Salt River Project | — |
| Owner(s) | Salt River Project | Salt River Project | — |
| Status | Operating | — | — |
Gila River Power Block 4 is a 619 MW natural gas-fired combined cycle power plant located in Maricopa County, Arizona. The plant began operating in 2003 and is owned and operated by Salt River Project. It consists of 3 generators utilizing natural gas as its primary fuel source. Gila River Power Block 4 operates within the Salt River Project balancing authority and the Western Electricity Coordinating Council (WECC) NERC region.
In the most recent year with available data, Gila River Power Block 4 generated 2,671,230 MWh of electricity, achieving a capacity factor of 49.3%. The plant is ranked as the 19th largest in Arizona out of 26 plants, and nationally it is ranked 382nd out of 945 plants.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
32.0K MWh
Latest Month
2.7M MWh
Annual Generation
49.3%
Capacity Factor
CO₂ Intensity
1207 lb/MWh
NOx
0.083 lb/MWh
SO₂
2013
$965/kW
Est. Construction Cost
Total estimated cost: $597.4M
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-03-26
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ask pi about Gila River Power Block 4Salt River Project (SRP)
Grid Voltage
500.0 kV
Regulatory Status
RE — Regulated
Entity Type
Political Subdivision
Sector
Electric Utility
0.006 lb/MWh
CH₄
0.004 lb/MWh
N₂O
0.000 lb/MWh
Capacity Factor
45.4%
Annual Net Gen
7391 GWh
CO₂eq
1207 lb/MWh
Subregion
WECC Southwest