Duffy BESSUnder construction
Matagorda County, Texas · EIA plant ID 69295 · Operator: Duffy Energy Storage LLC
236 MW under construction (Batteries), first expected Dec 2026 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service · 236 MW building
Net generation—GWh12 mo
Capacity factor—not meaningful for storage
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 |
|---|---|---|---|---|---|---|---|---|
| DFBSS | Batteries | BA | 235.9 | 235.9 | planned Dec 2026 | Under construction | — | coming soon |
Owner / operator
Operator: Duffy Energy Storage 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.
| Eldora Energy LLC | — | 3.7 km |
| South Texas Project | 2,709 MW | 7.6 km |
| Isaac Solar | — | 15.8 km |
| Pavlov | 10 MW | 16 km |
| Blackcat BESS | — | 16 km |
| Matagorda Clean Energy Center (BESS) | — | 16.1 km |