Pediment BESS I
Maricopa County, Arizona · EIA plant ID 68477 · Operator: Pediment BESS I LLC
Nameplate250MWSummer 250 MW
Generators1in service
Net generation-18GWh12 mo to Aug 2026
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online2026
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.
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Batteries | BA | 250 | 250 | Apr 2026 | Operating | — | coming soon |
Owner / operator
Operator: Pediment BESS I LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Pediment BESS I LLC | 100.0% | 250 MW |
Nearby plants
Within 80 km.
| Mesa Carport PV | 5 MW | 1 km |
| Queen Creek Solar Farm | 19 MW | 9.8 km |
| Santan | 1,326 MW | 14 km |
| Banner Solar Ironwood | 1 MW | 16.2 km |
| Gilbert Solar Facility I, LLC | 2 MW | 18.6 km |
| South Consolidated | 1 MW | 20.7 km |