Franklin Battery Storage
Twin Falls County, Idaho · EIA plant ID 67183 · Operator: Idaho Power Co
Nameplate60MWSummer 60 MW
Generators1in service
Net generation-8GWh12 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) |
|---|---|---|---|
| 2024 | -1.3 | — | — |
| 2025 | -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 |
|---|---|---|---|---|---|---|---|---|
| FRBS | Batteries | BA | 60 | 60 | Feb 2025 | Operating | — | coming soon |
Owner / operator
Operator: Idaho Power Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Idaho Power Co | 100.0% | 60 MW |
Nearby plants
Within 80 km.
| Jackpot Solar, LLC | 120 MW | 1.1 km |
| Franklin Solar Hybrid | 100 MW | 1.3 km |
| Rock Creek Dairy | retired | 34.2 km |
| Low Line Rapids | 3 MW | 36.8 km |
| Amalgamated Sugar Twin Falls | 13 MW | 40.5 km |
| Cargill Dry Creek Biofactory | retired | 40.6 km |