Imperial Solar Energy Center South
Imperial County, California · EIA plant ID 57490 · Operator: CSOLAR IV South LLC
Nameplate129MWSummer 129 MW
Generators1in service
Net generation251GWh12 mo to Dec 2025
Capacity factor22%solar units, summer MW
Heat rate—thermal plants only
First online2013
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) |
|---|---|---|---|
| 2013 | 155.7 | 81.8% | — |
| 2014 | 323.8 | 28.4% | — |
| 2015 | 319.7 | 28.3% | — |
| 2016 | 294.2 | 26.0% | — |
| 2017 | 280.6 | 24.9% | — |
| 2018 | 274.5 | 24.3% | — |
| 2019 | 281.5 | 24.9% | — |
| 2020 | 243 | 21.5% | — |
| 2021 | 291.2 | 25.8% | — |
| 2022 | 290.9 | 25.8% | — |
| 2023 | 277.2 | 24.6% | — |
| 2024 | 264.3 | 23.3% | — |
| 2025 | 251.1 | 22.2% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 56819 | Solar Photovoltaic | PV | 128.9 | 128.9 | Nov 2013 | Operating | — | coming soon |
Owner / operator
Operator: CSOLAR IV South LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Tenaska CSOLAR South Holdings, LLC | 49.0% | 63 MW |
| Tenaska IV South Partners, LLC | 48.0% | 62 MW |
| Tenaska CSOLAR South, LLC | 3.0% | 4 MW |
Nearby plants
Within 80 km.
| LeConte Energy Storage | 125 MW | 1.9 km |
| Drew Solar LLC | 100 MW | 2.7 km |
| Mount Signal Solar Farm II | 154 MW | 2.8 km |
| Centinela Solar Energy | 175 MW | 2.8 km |
| Wistaria Ranch Solar | 107 MW | 3.9 km |
| Imperial Valley Solar, LLC | 200 MW | 6.7 km |