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.
Reported plant capacity and configuration.
Primary generation technology.
Wolf Tank Storage LLC · Webb County · ERCOT
Battery subsystem rating.
Wolf Tank Storage is operating.
138 kV · South Texas Electric Cooperative, Inc. / Medina Electric Cooperative, Inc.
Installed equipment documented in public project records.
In July 2022, Aypa Power secured an $88 million construction and term loan facility for the Wolf Tank energy storage project.
WFTANK_ESR1
Batteries
1-hour storage duration
138 kV · South Texas Electric Cooperative, Inc. / Medina Electric Cooperative, Inc.
ERCOT
Similar plants ranked by technology, capacity, and distance.
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 |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
Webb County, Texas, and Wolf Tank Storage LLC entered into a Tax Abatement Agreement.
ERCOT · Webb County
The Webb County tax-abatement agreement explicitly names 'Wolf Tank Storage LLC' as the Owner.
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 (~179 MWh). Capacity factor is avg discharge vs. peak.
Observed ERCOT settlement prices at WFTANK_ESS1 over 363 days (2025-09-11 to 2026-09-10).
The TB1 figure is a price benchmark, not revenue: it values one perfect-foresight cycle per day between the cheapest and dearest hour 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.
Matched 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.
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
EIA-860 lists generator 1 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.
Wolf Tank Storage has a reported capacity of 150 MW and an energy capacity of 150 MWh. Source: EIA Form 860.
Wolf Tank Storage is a batteries facility in Webb County, TX, participating in the ERCOT market.
Wolf Tank Storage is in Webb County, TX, inside the ERCOT balancing area.
Wolf Tank Storage is operated by Wolf Tank Storage LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Wolf Tank Storage reported 61.7 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.
Wolf Tank Storage settles at WFTANK_ESS1, interconnects at WOVER (138-kV), on the South Texas Electric Cooperative, Inc. / Medina Electric Cooperative, Inc. system.
By capacity, Wolf Tank Storage ranks #85 of 962 operating plants of the same technology nationally. It ranks #35 of 223 in TX.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.
