Granite Mountain Solar West, LLC
Iron County, Utah · EIA plant ID 59945 · Operator: clearway renewable operation & maintenance llc
Nameplate50MWSummer 50 MW
Generators1in service
Net generation121GWh12 mo to Aug 2026
Capacity factor27%solar units, summer MW
Heat rate—thermal plants only
First online2016
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), solar 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.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2016 | 25.7 | 17.4% | — |
| 2017 | 128 | 29.0% | — |
| 2018 | 123.6 | 28.0% | — |
| 2019 | 125.4 | 28.4% | — |
| 2020 | 131.3 | 29.6% | — |
| 2021 | 125.1 | 28.3% | — |
| 2022 | 110.7 | 25.1% | — |
| 2023 | 120.9 | 27.4% | — |
| 2024 | 128.2 | 29.0% | — |
| 2025 | 125.2 | 28.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GMSW | Solar Photovoltaic | PV | 50.4 | 50.4 | Sep 2016 | Operating | — | coming soon |
Owner / operator
Operator: clearway renewable operation & maintenance llc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Clearway Energy, Inc | 100.0% | 50 MW |
Nearby plants
Within 80 km.
| Fiddler's Canyon #2 | 3 MW | 3.4 km |
| Granite Mountain BESS East | 80 MW | 7 km |
| Fiddler's Canyon #1 | 3 MW | 8.1 km |
| Granite Mountain Solar East, LLC | 80 MW | 8.8 km |
| Fiddler's Canyon 3 | 3 MW | 11.9 km |
| Three Peaks Power | 80 MW | 16.5 km |