Sealy BESS is a standalone, utility-scale battery energy storage system of 200 MW in Austin County, Texas. It is eligible for renewable tax credits and reached commercial operations in the third quarter of 2025.
Mapped infrastructure geometry associated with this asset.
EIA plant 69045 · Inventory for Sep 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| WAL | Batteries | Operating | 200 | 400 |
Mapped infrastructure geometry associated with this asset.
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Current generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| WAL | 200 MW 200 MW summer | Batteries BA | Jul 2025 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
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 (~409 MWh). Capacity factor is avg discharge vs. peak.
Observed ERCOT settlement prices at WAL_RN over 365 days (2025-11-11 to 2026-11-10).
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.
Where the plant sits in ERCOT: its market, pricing node, utility territory and the network around it, each with how it is known.
The site also falls inside the San Bernard Electric Coop, Inc and Fayette Electric Coop, Inc service territories.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
Project milestones and public references behind the asset profile.
Standalone 200 MW battery storage in Austin County, TX.
EIA-860 lists generator WAL with this operating date.
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.
Sealy BESS reports 200 MW battery storage of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.
Sealy BESS is a batteries facility in Austin County, TX, participating in the ERCOT market.
Sealy BESS is in Austin County, TX, inside the ERCOT balancing area.
Sealy BESS is operated by Sealy Power, LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Sealy BESS reported 143.6 GWh over the twelve months to 2026-08. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.
By capacity, Sealy BESS ranks #58 of 1,061 operating plants of the same technology nationally. It ranks #20 of 254 in TX.
