# Wolf Tank Storage

ERCOT asset profile · https://askthegrid.com/assets/facilities/wolf-tank-storage

Webb County · ERCOT

Wolf Tank Storage is a battery energy storage facility with 150 MW of EIA-reported operating capacity and 150 MWh of reported energy capacity in Webb County, Texas, registered as EIA Plant ID 66616. Its grid role is standalone battery energy-storage resource providing dispatchable energy and ancillary services.

## Profile

- **Grid role:** Standalone battery energy-storage resource providing dispatchable energy and ancillary services (storage/ESR — storage arbitrage / grid services)
- **Grid connection:** WOVER (138-kV) · 138 kV · South Texas Electric Cooperative, Inc. / Medina Electric Cooperative, Inc.
- **Physical build:** Lithium-ion battery energy storage facility comprised of lithium-ion batteries organized in modules and installed rack towers; nameplate ~150 MW AC, one-hour (~150 MWh) storage.
- **Financing:** In July 2022, Aypa Power secured an $88 million construction and term loan facility for the Wolf Tank energy storage project.

## Metrics

- **Power / energy:** 150 MW / 150 MWh — Reported plant capacity and configuration.
- **Technology:** Batteries — Primary generation technology.
- **Registry anchor:** Plant 66616 — Wolf Tank Storage LLC · Webb County · ERCOT
- **Storage duration:** 1 hour — Battery subsystem rating.
- **Operating status:** Operating — Wolf Tank Storage is operating.
- **Grid connection:** WOVER (138-kV) — 138 kV · South Texas Electric Cooperative, Inc. / Medina Electric Cooperative, Inc.
- **Equipment:** 1 PCS units — Installed equipment documented in public project records. ([source](https://www.tesla.com/megapack))
- **Project financing:** $88M — In July 2022, Aypa Power secured an $88 million construction and term loan facility for the Wolf Tank energy storage project.
- **Resource stack:** 1 resource — WFTANK_ESR1

## Facts

- **Reported capacity:** 150 MW — Batteries · confidence: high
- **Energy:** 150 MWh — 1-hour storage duration · confidence: medium
- **Interconnection:** WOVER (138-kV) — 138 kV · South Texas Electric Cooperative, Inc. / Medina Electric Cooperative, Inc. · confidence: medium
- **Location:** Webb County — ERCOT · confidence: high
- **Operator:** Wolf Tank Storage LLC · confidence: high
- **Asset role:** batteries — ERCOT · Webb County
- **Owner:** Wolf Tank Storage LLC — The Webb County tax-abatement agreement explicitly names 'Wolf Tank Storage LLC' as the Owner. · confidence: high

## Related parties

- **Owner / operator / developer:** Aypa Power (Blackstone) — Owner / operator / developer for Wolf Tank Storage ([source](https://aypa.com/))

## Sources

- [~* TEX>~ - PUC Interchange - Texas.gov](https://interchange.puc.texas.gov/Documents/56006_354_1442787.PDF) — interchange.puc.texas.gov · regulatory — Nov 15, 2024 — Wolf Tank Storage. ETT-192. Interconnection: P21136005. Wolf Tank Storage. 138-kV Substation. Webb. Install WSL meter for Collector station at.
- [~* TEX>~](https://interchange.puc.texas.gov/Documents/55224_3_1310792.PDF) — interchange.puc.texas.gov · regulatory — I. WITHDRAWAL OF REQUEST FOR EMERGENCY RELIEF.
- [Combo & Single Model ESR Names](https://www.ercot.com/files/docs/2025/02/14/Single-Model-ESR-Names_01Oct2025-as-of-10-3-25-1545.xlsx) — ercot.com · regulatory — WFTANK ESS1 WFTANK_LD1 ESR1 WFTANK_ESR1 45687 288 286. Substation code changed from WOV to WOVER.

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Canonical page: https://askthegrid.com/assets/facilities/wolf-tank-storage
Website: [Aypa Power](https://aypa.com/)
Profile published: 2026-07-17T03:35:07.147Z
Source: Ask the Grid — https://askthegrid.com/