Cartwheel 1 - Storage
Cartwheel BESS, LLCHopkins County
Battery enclosures under construction at RWE's Cartwheel project.
Source: RWECartwheel 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.
Mapped infrastructure geometry associated with this asset.
EIA plant 68513 · Inventory for Aug 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| CWHBA | Batteries | Operating | 300 | 300 |
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| CWHBA | 300 MW 300 MW summer | Batteries Electricity used for energy storage · BA | Dec 2025 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
Sendero Energy Services announced its award of civil site work including site preparation, grading, fill, access roads, drainage, and environmental protection for the Cartwheel BESS, substation, and switchyard.
EIA-923 reports gross generation and net grid exchange for storage plants. Gross generation is shown as a discharge proxy; it is not a cycle count or conventional capacity factor.
1 ERCOT market resource · Battery / storage
Cycles/day is discharged energy vs. usable capacity (~305 MWh). Capacity factor is avg discharge vs. peak.
Observed ERCOT settlement prices at CARTWHL_RN over 365 days (2025-10-12 to 2026-10-11).
The TB2 figure is a price benchmark, not revenue: it values one perfect-foresight cycle per day between the 2 cheapest and 2 dearest hours of each day, gross of round-trip losses, and excludes ancillary services. It describes what this node’s price shape was worth over the window — it is not this asset’s realized capture, and no dispatch is assumed or modelled.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Bright Arrow Solar, LLC | 403.6 MW | TX | |
| Cartwheel 1 - Storage, LLCCurrent | 300 MW | TX | |
| Peregrine Solar | 300 MW | TX | |
| Fifth Standard Solar PV, LLC (Hybrid) | 287 MW | CA | |
| Radfords Run Wind Farm | 278 MW | IL | |
| Emily Solar, LLC | 273.6 MW | IL | |
| Pyron Wind Farm LLC Hybrid | 258.9 MW | TX | |
| Copper Mountain Solar 3 | 255 MW | NV |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioRWE announced that onsite construction was underway at Cartwheel 1, with completion and commissioning planned for 2025; the project was described as 150 MW / 300 MWh.
Cartwheel BESS, LLC filed a notice of self-certification as an exempt wholesale generator with FERC (Docket EG25-000, Accession 20250520-5155). The filing stated that Cartwheel BESS would own and operate an approximately 150 MW / 300 MWh facility in Sulphur Springs, with commercial operation estimated for late 2025.
Cartwheel BESS entered commercial operation. RWE's March 2026 project review identified Cartwheel as a recently completed 150 MW / 300 MWh BESS project commissioned during 2025.
ERCOT SCED disclosure is delayed, so plant performance windows end at the latest disclosed interval.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Cartwheel 1 - Storage reports 300 MW battery storage of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.
Cartwheel 1 - Storage is a batteries facility in Hopkins County, TX, participating in the ERCOT market.
Cartwheel 1 - Storage is in Hopkins County, TX, inside the ERCOT balancing area.
Cartwheel 1 - Storage is operated by RWE Clean Energy according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Cartwheel 1 - Storage reported 34.2 GWh over the twelve months to 2026-07. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.
By capacity, Cartwheel 1 - Storage ranks #16 of 1,061 operating plants of the same technology nationally. It ranks #4 of 254 in TX.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.