Twelvemile Solar 3Under construction
Mayes County, Oklahoma · EIA plant ID 68089 · Operator: Leeward Asset Management, LLC
200 MW under construction (Solar Photovoltaic), first expected Dec 2026 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service · 200 MW building
Net generation—GWh12 mo
Capacity factor—no 923 generation in the last 12 months
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 |
|---|---|---|---|---|---|---|---|---|
| TS03 | Solar Photovoltaic | PV | 200 | 200 | planned Dec 2026 | Under construction | — | coming soon |
Owner / operator
Operator: Leeward Asset Management, 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.
| Saltbranch Solar 1 | 73 MW | 0 km |
| Twelvemile Solar 2 | 52 MW | 0 km |
| Twelvemile Solar 1 | 152 MW | 0 km |
| Saltbranch 2 | 73 MW | 0 km |
| Markham | 128 MW | 11.9 km |
| Chouteau | 1,070 MW | 12.9 km |