Flat Ridge 4
Harper County, Kansas · EIA plant ID 68222 · Operator: Public Service Co of Oklahoma
Nameplate134MWSummer 134 MW
Generators1in service
Net generation375GWh12 mo to Feb 2026
Capacity factor43%wind units, summer MW
Heat rate—thermal plants only
First online2025
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), wind 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) |
|---|---|---|---|
| 2025 | 282.7 | 41.1% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| OP | Onshore Wind Turbine | WT | 134 | 134 | Jun 2025 | Operating | — | vestas V150-14.5 |
Owner / operator
Operator: Public Service Co of Oklahoma. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Public Service Co of Oklahoma | 100.0% | 134 MW |
Nearby plants
Within 80 km.
| Kingman Municipal Power and Light Plant | 19 MW | 6.9 km |
| Flat Ridge 5 | 153 MW | 15.7 km |
| Anthony | 11 MW | 21.1 km |
| Flat Ridge 2 Wind Energy LLC | 470 MW | 22.1 km |
| Viola Generating Station | — | 30.4 km |
| Flat Ridge 3 | 128 MW | 36.2 km |