Edwards Sanborn S4
Kern County, California · EIA plant ID 65677 · Operator: Terra-Gen Operating Co-Hybrid
Nameplate60MWSummer 60 MW
Generators2in service
Net generation93GWh12 mo to Aug 2026
Capacity factor26%solar units, summer MW
Heat rate—thermal plants only
First online2022
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) |
|---|---|---|---|
| 2022 | 10.1 | 16.8% | — |
| 2023 | 68.7 | 19.1% | — |
| 2024 | 72.4 | 20.2% | — |
| 2025 | 88.9 | 24.8% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| BESS | Batteries | BA | 18.8 | 18.8 | Jul 2023 | Operating | — | coming soon |
| PV | Solar Photovoltaic | PV | 41.2 | 41.2 | Nov 2022 | Operating | — | coming soon |
Owner / operator
Operator: Terra-Gen Operating Co-Hybrid. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| EdSan 1B Group 1 Sanborn, LLC | 100.0% | 60 MW |
Nearby plants
Within 80 km.
| Edwards Sanborn S3 | 71 MW | 0.5 km |
| Sanborn Hybrid 3 | — | 1.9 km |
| Edwards Sanborn S1 | 85 MW | 2.1 km |
| Sanborn BESS 1 | 100 MW | 2.5 km |
| Sanborn BESS 3 | 169 MW | 2.5 km |
| Sanborn BESS 2 | 100 MW | 2.5 km |