Mesquite Generating Station Block 1
Maricopa County, Arizona · EIA plant ID 58557 · Operator: Salt River Project
Nameplate692MWSummer 620 MW
Generators3in service
Net generation3,007GWh12 mo to Aug 2026
Capacity factor55%gas/coal/oil units, summer MW
Heat rate7,514Btu/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) |
|---|---|---|---|
| 2013 | 578.4 | 12.3% | 7,515 |
| 2014 | 1,797.8 | 34.5% | 7,610 |
| 2015 | 2,370.8 | 45.5% | 7,392 |
| 2016 | 1,980 | 37.9% | 7,447 |
| 2017 | 1,982.7 | 38.0% | 7,422 |
| 2018 | 2,315.4 | 44.4% | 7,442 |
| 2019 | 3,216 | 61.7% | 7,341 |
| 2020 | 3,360.3 | 64.3% | 7,369 |
| 2021 | 2,759 | 50.8% | 7,390 |
| 2022 | 3,249.6 | 59.8% | 7,435 |
| 2023 | 3,596.3 | 66.2% | 7,412 |
| 2024 | 3,581.1 | 65.8% | 7,540 |
| 2025 | 3,522.5 | 64.9% | 7,564 |
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 |
|---|---|---|---|---|---|---|---|---|
| GT1 | Natural Gas Fired Combined Cycle | CT | 185.3 | 160 | Jun 2003 | Operating | — | coming soon |
| GT2 | Natural Gas Fired Combined Cycle | CT | 185.3 | 160 | Jun 2003 | Operating | — | coming soon |
| ST1 | Natural Gas Fired Combined Cycle | CA | 321 | 300 | 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).
| Salt River Project | 100.0% | 692 MW |
Nearby plants
Within 80 km.
| Mesquite Generating Station Block 2 | 692 MW | 0 km |
| Arlington Valley Energy Facility | 713 MW | 2.4 km |
| Red Hawk | 1,127 MW | 2.5 km |
| Sun Streams, LLC | 160 MW | 2.8 km |
| Arlington Valley Solar Energy I | 127 MW | 3 km |
| Agave | 150 MW | 3.3 km |