Gila River Power Block 3
Maricopa County, Arizona · EIA plant ID 59784 · Operator: Salt River Project
Nameplate619MWSummer 570 MW
Generators3in service
Net generation3,151GWh12 mo to Aug 2026
Capacity factor63%gas/coal/oil units, summer MW
Heat rate7,241Btu/kWhfossil units, electric fuel, HHV
First online2003Runs as baseload
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2014 | 1.1 | 0.0% | 9,930 |
| 2015 | 2,170.6 | 48.1% | 7,534 |
| 2016 | 2,386.9 | 52.8% | 7,486 |
| 2017 | 2,259.2 | 50.1% | 7,436 |
| 2018 | 2,585.9 | 57.3% | 7,507 |
| 2019 | 2,942.3 | 65.2% | 7,298 |
| 2020 | 2,835.6 | 62.7% | 7,548 |
| 2021 | 3,005.5 | 66.6% | 7,491 |
| 2022 | 2,330.2 | 46.7% | 7,802 |
| 2023 | 2,450.4 | 49.1% | 7,378 |
| 2024 | 3,204.3 | 64.0% | 7,298 |
| 2025 | 2,914.2 | 58.4% | 7,159 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| CTG5 | Natural Gas Fired Combined Cycle | CT | 174 | 164 | Jun 2003 | Operating | — | coming soon |
| CTG6 | Natural Gas Fired Combined Cycle | CT | 174 | 164 | Jun 2003 | Operating | — | coming soon |
| ST11 | Natural Gas Fired Combined Cycle | CA | 271 | 242 | Jun 2003 | Operating | — | coming soon |
Owner / operator
Operator: Salt River Project. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Tucson Electric Power Co | 75.0% | 464 MW |
| UNS Electric, Inc | 25.0% | 155 MW |
Nearby plants
Within 80 km.
| Gila River Power Station | 619 MW | 0 km |
| Gila River Power Block 1 | 619 MW | 0 km |
| Gila River Power Block 2 | 619 MW | 0 km |
| Paloma Solar Hybrid | 34 MW | 6 km |
| RE Gillespie 1 LLC | 15 MW | 6.3 km |
| Cotton Center Solar Hybrid | 34 MW | 7.3 km |