Royal SlopePlanned
Grant County, Washington · EIA plant ID 70419 · Operator: Royal Slope Solar LLC
520 MW planned (Batteries, Solar Photovoltaic), first expected Oct 2027 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service
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 |
|---|---|---|---|---|---|---|---|---|
| RSBA | Batteries | BA | 260 | 260 | planned Oct 2027 | Planned | — | coming soon |
| RSPV | Solar Photovoltaic | PV | 260 | 260 | planned Oct 2027 | Planned | — | coming soon |
Owner / operator
Operator: Royal Slope Solar 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.
| Wanapum | 1,220 MW | 3.9 km |
| Vantage Wind Energy LLC | 90 MW | 21.4 km |
| Priest Rapids | 950 MW | 26.5 km |
| Wild Horse | 273 MW | 27.6 km |
| PEC Headworks | retired | 30.8 km |
| Ostrea Solar, LLC | 80 MW | 39.6 km |