# Sealy BESS

ERCOT asset profile · https://askthegrid.com/assets/facilities/sealy-bess

Sealy Power LLC - Austin County - ERCOT

Sealy BESS is a 200 MW standalone battery energy storage system in Austin County, Texas, near the town of Sealy. The single-unit lithium-ion facility, registered with EIA under project company Sealy Power, LLC, began commercial operation in July 2025. The plant sells into ERCOT, settling at its own Walstrom BESS (Sealy BESS) price node. No whole-plant or unit retirement is scheduled; the facility is fully operating with all of its nameplate capacity in service.

## Metrics

- **Nameplate capacity:** 200 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 69045 — plant-69045

## Facts

- **Technology:** Batteries
- **Operator:** Sealy Power LLC

## Related parties

- **Owner / operator:** Sealy Power LLC — Facility registrant and plant operator identified in PUCT registration and FERC MBR index
- **Owner / parent company:** Tesla, Inc. — Identified as new controlling owner in PUCT amendment filed April 22, 2025 ([source](https://www.tesla.com))
- **Former owner / parent company:** Castleman Power Development LLC — Prior owner/control holder identified in PUCT amendment as owner before change to Tesla, Inc. ([source](https://castlemanpower.com))
- **Transmission owner / interconnecting utility:** CenterPoint Energy Houston Electric, LLC — Transmission Service Provider and Transmission Owner identified in ERCOT interconnection agreement and PUCT registration ([source](https://www.centerpointenergy.com))
- **Balancing authority / market operator / regulator:** Electric Reliability Council of Texas (ERCOT) — Regional balancing authority and wholesale market operator for the facility ([source](https://www.ercot.com))
- **Construction contractor:** Rueben Group — Civil construction contractor for Sealy BESS project ([source](https://ruebengroup.com))

## Sources

- [interchange.puc.texas.gov](https://interchange.puc.texas.gov/Documents/35077_1649_1314811.PDF) — interchange.puc.texas.gov · authoritative — Source retained for exact-record publication review.
- [interchange.puc.texas.gov](https://interchange.puc.texas.gov/Documents/57993_1_1491460.PDF) — interchange.puc.texas.gov · authoritative — Source retained for exact-record publication review.
- [interchange.puc.texas.gov](https://interchange.puc.texas.gov/search/documents/?controlNumber=35077&itemNumber=1649) — interchange.puc.texas.gov · authoritative — Source retained for exact-record publication review.
- [ocisenergy.com](https://ocisenergy.com/project/sealy-bess) — ocisenergy.com · public_source — Source retained for exact-record publication review.
- [ruebengroup.com](https://ruebengroup.com/more-projects) — ruebengroup.com · public_source — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/sealy-bess

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