# Hidden Lakes Reliability Project

ERCOT asset profile · https://askthegrid.com/assets/facilities/hidden-lakes-reliability-project

GridStor's self-integrated 220 MW battery near Galveston Bay

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.

## Profile

- **Development history:** GridStor acquired an up-to-450 MW / 900 MWh development envelope called Evelyn, then built the smaller 220 MW / 440 MWh Hidden Lakes facility tracked by EIA.

## Metrics

- **Storage:** 220 MW / 440 MWh — Two-hour EIA/owner built capacity.
- **Battery units:** 204 — Plus 68 inverter skids.
- **Project financing:** $74M — Separate from $86M tax-credit transfer.

## Facts

- **Owner / operator:** GridStor / Evelyn Energy Storage LLC
- **Self-integrator:** GridStor

## Related parties

- **Developer / owner / operator:** GridStor — Official acquisition, project, and completion records ([source](https://gridstor.com/project/hidden-lakes/))
- **Procurement / commissioning adviser:** Anza — Exact-project case study ([source](https://www.anzarenewables.com/case-studies/how-anza-delivered-technical-certainty-for-gridstors-self-integrated-440-mwh-project/))

## Sources

- [Hidden Lakes case study](https://www.anzarenewables.com/case-studies/how-anza-delivered-technical-certainty-for-gridstors-self-integrated-440-mwh-project/) — Anza · official contractor record — Exact equipment counts and GridStor self-integration role.

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Canonical page: https://askthegrid.com/assets/facilities/hidden-lakes-reliability-project

Source: Ask the Grid — https://askthegrid.com/