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.
Overview
Key fields
- 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.
- 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
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.
Structured profile
- Reported capacity
- 150 MW
Batteries
- Energy
- 150 MWh
1-hour storage duration
- Interconnection
- WOVER (138-kV)
138 kV · South Texas Electric Cooperative, Inc. / Medina Electric Cooperative, Inc.
- Location
- Webb County
ERCOT
- Operator
- Wolf Tank Storage LLC
- 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.
Units and generators
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 150 MW 150 MW summer | Batteries Electricity used for energy storage · BA | Jul 2023 | Operating |
Performance
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Peer context
- Technology capacity
- 150 MW
- National rank
- #85
- TX rank
- #35
Monthly generation
Download CSVEIA-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.
ERCOT disclosed dispatch
1 ERCOT market resource · Battery / storage
Dispatch
3 mo through May 21, 2026Cycles/day is discharged energy vs. usable capacity (~179 MWh). Capacity factor is avg discharge vs. peak.
Output by hourlocal time · 90 days through May 21, 2026
Latest disclosed outputhourly · 2 weeks ending May 21, 2026
Generation from ERCOT's 60-Day SCED Disclosure (≈60-day lag), summed over this site's market resources.
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 disclosuresOperating context
ERCOT market recordsInterconnection record
ERCOT GIS ReportMatched to the latest available ERCOT generation-interconnection queue record. Queue status and completion dates describe the queue record; operating status is verified separately against plant and market registrations.
Nearby substations
HIFLD infrastructure inventoryCommercial, land, and environmental record
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Land and environmental record
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.
Parties and identifiers
| Relationship | Entity | Basis |
|---|---|---|
| Owner / operator / developer | Owner / operator / developer for Wolf Tank Storage | |
| Market resources | WFTANK_ESR1 | Linked ERCOT resources. |
| Grid selection | plant:plant-66616 | Canonical asset page /ercot/assets/plant/wolf-tank-storage. |
Reporting portfolio
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
Timeline and sources
Project milestones and public references behind the asset profile.
Project timeline
- Tax Abatement AgreementWebb County...
Webb County, Texas, and Wolf Tank Storage LLC entered into a Tax Abatement Agreement.
- Generator enters operationEIA-860
EIA-860 lists generator 1 with this operating date.
- Latest disclosed generation interval
ERCOT SCED disclosure is delayed, so plant performance windows end at the latest disclosed interval.
Sources
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