Arroyo StorageUnder construction
Cameron County, Texas · EIA plant ID 69151 · Operator: BT Cantwell Solar, LLC
180 MW under construction (Batteries), first expected Nov 2026 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service · 180 MW building
Net generation-1GWh12 mo to Aug 2026
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online—
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), 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 |
|---|---|---|---|---|---|---|---|---|
| ARY_B | Batteries | BA | 180 | 180 | planned Nov 2026 | Under construction | — | coming soon |
Owner / operator
Operator: BT Cantwell 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.
| Harryoung PV and BESS | — | 2.5 km |
| Los Vientos Wind 1A | 200 MW | 7.8 km |
| Aggreko MSR Grid PC5 | 10 MW | 9.4 km |
| E. Porte Ct. | 9 MW | 9.6 km |
| La Chalupa, LLC | 199 MW | 10.1 km |
| Los Vientos Wind 1B | 202 MW | 10.9 km |