Electrolyte BESS
Kings County, California · EIA plant ID 66661 · Operator: Henrietta BESS LLC
Nameplate99MWSummer 99 MW
Generators1in service
Net generation-5GWh12 mo to Aug 2026
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online2025
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) |
|---|---|---|---|
| 2025 | -2.9 | — | — |
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 |
|---|---|---|---|---|---|---|---|---|
| HEN | Batteries | BA | 99.4 | 99.4 | May 2025 | Operating | — | coming soon |
Owner / operator
Operator: Henrietta BESS LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Henrietta BESS LLC | 100.0% | 99 MW |
Nearby plants
Within 80 km.
| Henrietta Peaker | 98 MW | 0.1 km |
| American Kings Solar, LLC | 128 MW | 0.6 km |
| Henrietta D Energy Storage LLC | 10 MW | 1.3 km |
| RE Kent South, LLC | 20 MW | 1.6 km |
| Slate Hybrid | 440 MW | 1.7 km |
| Kings CSG 3 LLC Community Solar | 3 MW | 2 km |