How big is Sealy BESS?

Sealy BESS has a reported capacity of 200 MW. Source: EIA Form 860M.

What kind of plant is Sealy BESS?

Sealy BESS is a batteries facility in Austin County, TX, participating in the ERCOT market.

Where is Sealy BESS located?

Sealy BESS is in Austin County, TX, inside the ERCOT balancing area.

Who operates Sealy BESS?

Sealy BESS is operated by Sealy Power, LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Sealy BESS generate?

Sealy BESS reported 127.8 GWh over the twelve months to 2026-06. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.

How does Sealy BESS compare to other plants?

By capacity, Sealy BESS ranks #48 of 962 operating plants of the same technology nationally. It ranks #18 of 223 in TX.

Sealy BESS — 200 MW battery storage, Austin County, TX

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Sealy BESS — 200 MW battery storage, Austin County, TX · Ask the Grid

Overview

Nameplate capacity: 200 MW
Canonical EIA plant baseline.
Registry anchor: Plant 69045
plant-69045
Resource stack: 1 resource
WAL_ESR1

Structured profile

Technology: Batteries
Operator: Sealy Power LLC

Related assets

Similar plants ranked by technology, capacity, and distance.

Bypass BESS

Batteries · 200 MW

Fort Bend County

Same typeComparable scale43 mi away

Compare with this plant

Citadel Battery Storage Plant

Batteries · 204 MW

Harris County

Same typeComparable scale71 mi away

Compare with this plant

Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
WAL	200 MW 200 MW summer	Batteries Electricity used for energy storage · BA	Jul 2025	Operating

Performance

Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.

Peer context

Technology capacity: 200 MW; Batteries
National rank: #48; of 962 operating peers
TX rank: #18; of 223 operating peers

Monthly generation

Download CSV

Latest 12 months

127.8 GWh

Reported gross generation

Latest report

Jun 2026

EIA-923 monthly filing

Grid and market context

Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.

Market registration

ERCOT public disclosures

Settlement point

WAL_RN

medium confidence spatial and capacity match

Market resources

1 resource

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Transactions and agreements

Regulatory Filing

Jul 25, 2023

CenterPoint Energy Houston Electric filed an ERCOT Standard Generation Interconnection Agreement with Sealy Power LLC (Tesla) to the Texas Public Utility Commission. The agreement was dated June 30, 2023.

CenterPoint Energy Houston Electric, LLC · Sealy Power LLC

interchange.puc.texas.gov

Construction

2024

Rueben Group completed civil construction scope for Sealy BESS, including site clearing and grading; BESS and substation pad construction; and underground wet utilities (water, stormwater, and erosion control).

Rueben Group

ruebengroup.com

Ownership Change

Apr 22, 2025

Sealy Power LLC filed a PUCT amendment stating a change in ownership/control from Castleman Power Development LLC to Tesla, Inc. The amendment was notarized on April 15, 2025. The filing does not establish a transfer closing date or consideration amount.

Castleman Power Development LLC · Tesla, Inc. · Sealy Power LLC

interchange.puc.texas.gov

Commercial Operation

Jul 1, 2025

Sealy BESS achieved commercial operations. The project page reports Q3 2025 commercial operations; Q3 begins July 1.

Sealy Power LLC

ocisenergy.com

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Relationship graph

Drag organizations to explore the network. Select a node to pin its details and available page link.

AssetProject companyOwner / operatorOrganizationMarket / regulatorContractor

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Jul 25, 2023
Jul 25, 2023
ERCOT Standard Generation Interconnection Agreement filedinterchange...
CenterPoint Energy Houston Electric filed an ERCOT Standard Generation Interconnection Agreement with Sealy Power LLC (Tesla) to the Texas Public Utility Commission. The agreement was dated June 30, 2023.
2024
2024

Sealy BESS

Sealy BESS

Overview

Structured profile

Related assets

Bypass BESS

Citadel Battery Storage Plant

Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Market registration

Commercial, land, and environmental record

Transactions and agreements

Related parties and identifiers

Relationship graph

Timeline and sources

Project timeline

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ERCOT disclosed dispatch

Dispatch

Output by hourlocal time · 90 days through Jul 28, 2026

Latest disclosed outputhourly · 2 weeks ending Jul 28, 2026

Operating context

Nearby substations

Parties and identifiers

Reporting portfolio

Sources

Common questions about Sealy BESS