MammothPlanned
Kanawha County, West Virginia · EIA plant ID 70559 · Operator: GSRP
166 MW planned (Batteries, Solar Photovoltaic), first expected Dec 2028 · 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 |
|---|---|---|---|---|---|---|---|---|
| BESS1 | Batteries | BA | 70 | 70 | planned Jun 2029 | Planned | — | coming soon |
| BESS2 | Batteries | BA | 10 | 10 | planned Jun 2029 | Planned | — | coming soon |
| GEN1 | Solar Photovoltaic | PV | 86 | 86 | planned Dec 2028 | Planned | — | coming soon |
Owner / operator
Operator: GSRP. 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.
| London | 14 MW | 5.6 km |
| Glen Ferris Hydro | 6 MW | 10.6 km |
| Hawks Nest Hydro | 102 MW | 13.5 km |
| Marmet | 14 MW | 23.3 km |
| Gauley River Power Partners | 80 MW | 36.6 km |
| New River Clean Energy | 3 MW | 45.5 km |