Mount Signal Solar Farm V
Imperial County, California · EIA plant ID 61202 · Operator: Imperial Valley Solar 3, LLC
Nameplate252MWSummer 252 MW
Generators1in service
Net generation632GWh12 mo to Aug 2026
Capacity factor29%solar units, summer MW
Heat rate—thermal plants only
First online2018
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) |
|---|---|---|---|
| 2018 | 79.8 | 21.6% | — |
| 2019 | 624.5 | 28.3% | — |
| 2020 | 596 | 26.9% | — |
| 2021 | 644.9 | 29.2% | — |
| 2022 | 623.4 | 28.2% | — |
| 2023 | 639.6 | 28.9% | — |
| 2024 | 602.1 | 27.2% | — |
| 2025 | 674.3 | 30.5% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| MTSG3 | Solar Photovoltaic | PV | 252.3 | 252.3 | Nov 2018 | Operating | — | coming soon |
Owner / operator
Operator: Imperial Valley Solar 3, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Imperial Valley Solar 3, LLC | 100.0% | 252 MW |
Nearby plants
Within 80 km.
| Imperial Valley Solar, LLC | 200 MW | 2.1 km |
| Heber Solar | 11 MW | 4.5 km |
| Wistaria Ranch Solar | 107 MW | 4.9 km |
| Second Imperial Geothermal | 75 MW | 4.9 km |
| Mount Signal Solar Farm II | 154 MW | 5.9 km |
| Heber Geothermal | 92 MW | 6.1 km |