Black Walnut Energy Storage LLC
Ventura County, California · EIA plant ID 65396 · Operator: black walnut energy storage llc
Nameplate15MWSummer 15 MW
Generators1in service
Net generation-0GWh12 mo to Dec 2025
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online2025
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) |
|---|---|---|---|
| 2025 | -0.3 | — | — |
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 |
|---|---|---|---|---|---|---|---|---|
| BW1 | Batteries | BA | 15 | 15 | Oct 2025 | Operating | — | coming soon |
Owner / operator
Operator: black walnut energy storage llc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| black walnut energy storage llc | 100.0% | 15 MW |
Nearby plants
Within 80 km.
| Santa Paula Energy Storage LLC | 30 MW | 0.2 km |
| Saticoy | 100 MW | 14.5 km |
| Springville Hydroelectric | 1 MW | 14.9 km |
| Ventura Solar | 3 MW | 15 km |
| Hecate Grid Gwent Storage 1 | — | 16.5 km |
| Silverstrand Grid Energy Storage System | 11 MW | 16.8 km |