Optimist
Clay County, Mississippi · EIA plant ID 68536 · Operator: Origis Energy USA, Inc
Nameplate250MWSummer 250 MW
Generators2in service
Net generation301GWh12 mo to Aug 2026
Capacity factor26%solar units, summer MW
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), 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.
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 |
|---|---|---|---|---|---|---|---|---|
| MS7_S | Batteries | BA | 50 | 50 | Jan 2026 | Operating | — | coming soon |
| OEMS7 | Solar Photovoltaic | PV | 200 | 200 | Jan 2026 | Operating | — | coming soon |
Owner / operator
Operator: Origis Energy USA, Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Origis Energy USA, Inc | 100.0% | 250 MW |
Nearby plants
Within 80 km.
| SR Magnolia | — | 24.8 km |
| Golden Triangle | 250 MW | 25.1 km |
| Golden Triangle II | 200 MW | 25.5 km |
| New Caledonia | — | 25.9 km |
| Mississippi State University | 26 MW | 28.7 km |
| Caledonia | 801 MW | 29.8 km |