# Cartwheel 1 - Storage, LLC

ERCOT asset profile · https://askthegrid.com/assets/facilities/cartwheel-1-storage-llc

Cartwheel BESS, LLC - Hopkins County - ERCOT

Cartwheel 1 - Storage, LLC is a 150 MW / 300 MWh battery energy storage system (BESS) located in Sulphur Springs, Hopkins County, Texas. The facility is owned and operated by Cartwheel BESS, LLC, a wholly owned subsidiary within the RWE group. It is interconnected with Oncor Electric Delivery Company's transmission system at Tap 345kV 1697 Sulphur Springs Switch–2464 Cash Switch and operates in the ERCOT market as a wholesale generation resource. The facility was commissioned in late 2025 and provides energy storage capacity to support grid stability and resilience in the ERCOT region.

## Metrics

- **Nameplate capacity:** 300 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 68513 — plant-68513

## Facts

- **Technology:** Batteries
- **Operator:** Cartwheel BESS, LLC

## Related parties

- **Owner / operator:** Cartwheel BESS, LLC — legal facility owner and operator
- **Owner / parent company:** RWE Investco EPC Mgmt, LLC — direct ownership parent of Cartwheel BESS, LLC
- **Parent company / equity investor:** RWE Investco Mgmt, LLC — 95% owner of RWE Investco EPC Mgmt, LLC
- **Parent company / equity investor:** RWE Clean Energy Development, LLC — 5% owner of RWE Investco EPC Mgmt, LLC
- **Parent company:** RWE US Holdings, LLC — parent of RWE Clean Energy, LLC
- **Parent company:** RWE Renewables International Participations BV — upstream parent
- **Parent company:** RWE Renewables Europe & Australia GmbH — upstream parent
- **Parent company:** GBV ZweiunddreiBigste Gesellschaft fur Beteiligungsverwaltung GmbH — upstream parent
- **Parent company:** RWE AG — ultimate corporate parent ([source](https://www.rwe.com/en))
- **Operator / O&M provider:** RWE Clean Energy, LLC — developer and operating group ([source](https://www.rwe.com/en))
- **EPC contractor / construction contractor:** RES — design, engineering, and construction partner ([source](https://www.res-group.com/en))
- **Construction contractor:** Sendero Energy Services — civil construction, substation, and switchyard contractor ([source](https://senderoenergyservices.com/))
- **Equipment supplier:** SMA Americas — inverter supplier
- **Transmission owner / interconnecting utility:** Oncor Electric Delivery Company, LLC — transmission owner and interconnecting utility ([source](http://oncor.com/content/oncorwww/us/en/home.html))
- **Balancing authority / market operator:** Electric Reliability Council of Texas (ERCOT) — market operator and balancing authority ([source](https://www.ercot.com))

## Sources

- [americas.rwe.com](http://americas.rwe.com/press/2024-10-02-rwe-surpasses-900-mw-of-battery-storage-projects-under-construction-in-the-us) — americas.rwe.com · public_source — Source retained for exact-record publication review.
- [interchange.puc.texas.gov](http://interchange.puc.texas.gov/Documents/54974_339_1528061.PDF) — interchange.puc.texas.gov · authoritative — Source retained for exact-record publication review.
- [mgrid.org](https://mgrid.org/2026/03/05/mgrid-org-cartwheel-150-mw-300-mwh-sulphur-springs-microgrid/) — mgrid.org · public_source — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/cartwheel-1-storage-llc

Source: Ask the Grid — https://askthegrid.com/