Hidden Lakes Reliability Project
Evelyn Energy Storage LLCGalveston County
Hidden Lakes is GridStor's 220 MW / 440 MWh two-hour battery in Galveston County. Anza's exact-project case study records 204 battery units and 68 inverter skids in GridStor's self-integrated design; the project occupies about 15 acres, with enclosures on roughly five.
Mapped infrastructure geometry associated with this asset.
Illustrative BESS equipment layout for comparing sites. Not an as-built site map.
EIA plant 68809 · Inventory for Aug 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| HL001 | Batteries | Operating | 220 | 440 |
Mapped infrastructure geometry associated with this asset.
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| HL001 | 220 MW 220 MW summer | Batteries Electricity used for energy storage · BA | Oct 2025 | 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.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
Project milestones and public references behind the asset profile.
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 (~412 MWh). Capacity factor is avg discharge vs. peak.
Observed ERCOT settlement prices at EVLN_ESS_RN over 365 days (2025-10-12 to 2026-10-11). This plant is also crosswalked to HDNLAKES_RN; the point with the deepest price history is shown.
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.
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
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.
Hidden Lakes Reliability Project reports 220 MW battery storage of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.
Hidden Lakes Reliability Project is a Self-integrated battery storage facility in Galveston County, TX, participating in the ERCOT market.
Hidden Lakes Reliability Project is in Galveston County, TX, inside the ERCOT balancing area.
Hidden Lakes Reliability Project is operated by Evelyn Energy Storage LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Hidden Lakes Reliability Project reported 39.8 GWh over the twelve months to 2026-07. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.
Hidden Lakes Reliability Project interconnects at Hidden Lakes.
By capacity, Hidden Lakes Reliability Project ranks #51 of 1,061 operating plants of the same technology nationally. It ranks #16 of 254 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.