# Cunningham Storage

ERCOT asset profile · https://askthegrid.com/assets/facilities/cunningham-storage

Rayburn County Electric Cooperative · Hunt County · ERCOT

Cunningham Storage is a battery energy storage facility with 190 MW of EIA-reported operating capacity and 380 MWh of reported energy capacity in Hunt County, Texas, registered as EIA Plant ID 65410. Acciona Energy USA Global, LLC is the registered plant entity or operator. Commercial operation began in 2023.

## Profile

- **Grid role:** storage arbitrage, peaking, grid stability, ancillary services
- **Context:** ACCIONA stated the 190 MW / 380 MWh Cunningham facility would be the largest operating battery energy storage project on the Texas grid upon commissioning (ACCIONA press release, Dec 13, 2022).
- **Physical build:** 190 MW / 380 MWh battery energy storage system consisting of 159 cabinets (cabinetized BESS blocks) of 2.4 MWh each (manufactured by Sungrow) using liquid-cooled cells supplied by CATL.

## Metrics

- **Power / energy:** 190 MW / 380 MWh — Reported plant capacity and configuration.
- **Technology:** Batteries — Primary generation technology.
- **Registry anchor:** Plant 65410 — Acciona Energy USA Global, LLC · Hunt County · ERCOT
- **Storage duration:** 2 hours — Battery subsystem rating.
- **Operating status:** Operating — Cunningham Storage is operating.
- **Equipment:** 159 containers — Installed equipment documented in public project records. ([source](https://www.sungrowpower.com/en/products/utility-energy-storage-system))
- **Commercial operation:** 2023 — Best-supported operating milestone.
- **Resource stack:** 1 resource — TURQBESS_ESR1

## Facts

- **Reported capacity:** 190 MW — Batteries · confidence: high
- **Energy:** 380 MWh — 2-hour storage duration · confidence: medium
- **Commercial operation:** 2023 · confidence: medium
- **Operating status:** operating — Cunningham Storage is operating. · confidence: medium
- **Location:** Hunt County — ERCOT · confidence: high
- **Owner:** ACCIONA Energía — These together support listing ACCIONA Energía as the public owner name. · confidence: medium

## Related parties

- **Owner / operator:** ACCIONA Energía — Owner / operator for Cunningham Storage ([source](https://acciona-energia.com/))
- **Battery supplier:** Sungrow (CATL cells) — Battery supplier for Cunningham Storage ([source](https://sungrowpower.com/))
- **Optimizer:** Habitat Energy — Optimizer for Cunningham Storage ([source](https://habitat.energy/))

## Sources

- [~* TEX>~](https://interchange.puc.texas.gov/Documents/53385_3113_1478599.PDF) — interchange.puc.texas.gov · regulatory — owner of the Cunningham Storage Project located in Hunt County
- [Combo & Single Model ESR Names](https://www.ercot.com/files/docs/2025/02/14/single-model-esr-names_18Sep2025-as-of-9-22-25-1600.xlsx) — ercot.com · regulatory — Feb 14, 2025 — TURQBESS_ESR1, 45687.
- [Combo & Single Model ESR Names](https://www.ercot.com/files/docs/2025/02/14/single-model-esr-names.xlsx) — ercot.com · regulatory — Feb 14, 2025 — The Single Model Energy Strorage Resource Names that become effective with the RTCB. 45687.
- [cunningham battery energy storage system](https://www.acciona.com/projects/cunningham-battery-storage) — acciona.com · other — Jan 30, 2025 — The 190MW/380MWh Cunningham facility is one of the largest operating battery energy storage projects on the Texas grid. 190MW/380MWh (2-hour storage)
- [Habitat Energy to optimize ACCIONA Energía’s 190MW Cunningham battery](https://habitat.energy/habitat-energy-to-optimize-acciona-energias-cunningham-battery-in-ercot/) — habitat.energy · other — Habitat will begin operating the battery from June 2024 in time for the critical summer period when high demand and variable renewable generation have driven increased price volatility in recent years.
- [ACCIONA Energía acquires largest battery storage project...](https://www.acciona.com/updates/news/acciona-energia-acquires-largest-battery-storage-project-in-texas-and-1gw-of-bess-pipeline) — acciona.com · other — Dec 13, 2022 — The 190MW/380MWh Cunningham facility will be the largest operating battery energy storage project on the Texas grid upon commissioning next year

---

Canonical page: https://askthegrid.com/assets/facilities/cunningham-storage
Website: [ACCIONA Energía](https://acciona-energia.com/)
Profile published: 2026-07-17T03:34:11.189Z
Source: Ask the Grid — https://askthegrid.com/