Atlas VIIIUnder construction
La Paz County, Arizona · EIA plant ID 68323 · Operator: Atlas VIII LLC
382 MW under construction (Batteries), first expected Dec 2026 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service · 382 MW building
Net generation—GWh12 mo
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online—
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 |
|---|---|---|---|---|---|---|---|---|
| ALT8A | Batteries | BA | 210 | 210 | planned Dec 2026 | Under construction | — | coming soon |
| ALT8B | Batteries | BA | 172.4 | 172.4 | planned Jan 2027 | Under construction | — | coming soon |
Owner / operator
Operator: Atlas VIII LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
Nearby plants
Within 80 km.
| Atlas BESS IV LLC | — | 0 km |
| ATLAS II | — | 0 km |
| ATLAS SOLAR IV | — | 0 km |
| Atlas IX | 150 MW | 0 km |
| Atlas VII | 300 MW | 0 km |
| ATLAS Solar VI, LLC | 100 MW | 0.5 km |