Hecate Energy Longhorn Solar LLC
Jack County, Texas · EIA plant ID 68839 · Operator: Repsol Renewables NA
Nameplate650MWSummer 650 MW
Generators1in service
Net generation737GWh12 mo to Aug 2026
Capacity factor31%solar units, summer MW
Heat rate—thermal plants only
First online2026
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), solar 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.
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 |
|---|---|---|---|---|---|---|---|---|
| RRPS | Solar Photovoltaic | PV | 650 | 650 | Apr 2026 | Operating | — | coming soon |
Owner / operator
Operator: Repsol Renewables NA. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Repsol Renewables NA | 100.0% | 650 MW |
Nearby plants
Within 80 km.
| O'Bannion Energy Storage | — | 0.4 km |
| Barton Chapel Wind Farm | 120 MW | 6.2 km |
| Senate Wind LLC | 150 MW | 18.1 km |
| Keechi Wind | 110 MW | 20 km |
| Graham | 635 MW | 27.2 km |
| Jack County | 1,280 MW | 36.3 km |