Firefly Solar PAPlanned
Lawrence County, Pennsylvania · EIA plant ID 67984 · Operator: vesper energy development llc
402 MW planned (Solar Photovoltaic), first expected Dec 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 |
|---|---|---|---|---|---|---|---|---|
| FFLPA | Solar Photovoltaic | PV | 401.6 | 401.6 | planned Dec 2027 | Planned | — | coming soon |
Owner / operator
Operator: vesper energy development 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.
| New Castle Plant | 354 MW | 5.4 km |
| Hickory Run Energy Station | 1,034 MW | 7.1 km |
| Carbon Limestone | retired | 10.5 km |
| Mahoning | 4 MW | 13 km |
| Beaver Valley Patterson Dam | 1 MW | 22.8 km |
| Townsend Hydro | 5 MW | 24 km |