SE Athos II, LLC
Riverside County, California · EIA plant ID 64290 · Operator: SE Athos II, LLC
402 MW under construction (Batteries), first expected Jan 2027 · EIA-860M
Nameplate200MWSummer 200 MW
Generators1in service · 402 MW building
Net generation510GWh12 mo to Aug 2026
Capacity factor29%solar units, summer MW
Heat rate—thermal plants only
First online2021
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), solar units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
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) |
|---|---|---|---|
| 2021 | 33.3 | 22.4% | — |
| 2022 | 615.7 | 35.1% | — |
| 2023 | 575.3 | 32.8% | — |
| 2024 | 487.5 | 27.8% | — |
| 2025 | 562 | 32.1% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| IPAT2 | Solar Photovoltaic | PV | 200 | 200 | Dec 2021 | Operating | — | coming soon |
| ATH1N | Batteries | BA | 100 | 100 | planned Jan 2027 | Under construction | — | coming soon |
| ATH1S | Batteries | BA | 102.3 | 102.3 | planned Jan 2027 | Under construction | — | coming soon |
| ATHB2 | Batteries | BA | 200 | 200 | planned Jan 2027 | Under construction | — | coming soon |
Owner / operator
Operator: SE Athos II, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| SE Athos II, LLC | 100.0% | 200 MW |
Nearby plants
Within 80 km.
| Athos Solar Project | 250 MW | 0 km |
| Oberon Solar Project | 375 MW | 3.5 km |
| Oberon II Solar Project | 375 MW | 3.5 km |
| Easley Solar | 350 MW | 4.2 km |
| Desert Harvest, LLC | 80 MW | 5.9 km |
| Desert Harvest II LLC | 105 MW | 5.9 km |