Coso Battery Storage
Inyo County, California · EIA plant ID 63943 · Operator: Arevon Asset Management
Nameplate60MWSummer 60 MW
Generators1in service
Net generation-13GWh12 mo to Aug 2026
Capacity factor—not meaningful for storage
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), primary-fuel units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
No capacity factor available.
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 | -9.1 | — | — |
| 2023 | -12.1 | — | — |
| 2024 | -12.8 | — | — |
| 2025 | -14.2 | — | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 61730 | Batteries | BA | 60 | 60 | Apr 2022 | Operating | — | coming soon |
Owner / operator
Operator: Arevon Asset Management. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| John Hancock | 75.0% | 45 MW |
| Capital Dynamics | 25.0% | 15 MW |
Nearby plants
Within 80 km.
| Mordor ES1 | 25 MW | 0.4 km |
| Mordor ES2 | 20 MW | 0.4 km |
| Coso Energy Developers | 90 MW | 2.1 km |
| Coso Power Developers | 90 MW | 2.2 km |
| Coso Finance Partners | 92 MW | 3.5 km |
| Haiwee | 6 MW | 17.4 km |