How big is Desert Willow Energy Storage?

Desert Willow Energy Storage has a reported capacity of 150 MW and an energy capacity of 300 MWh. Source: EIA Form 860M.

What kind of plant is Desert Willow Energy Storage?

Desert Willow Energy Storage is a Lithium-iron-phosphate battery storage facility in Ellis County, TX, participating in the ERCOT market.

Where is Desert Willow Energy Storage located?

Desert Willow Energy Storage is in Ellis County, TX, inside the ERCOT balancing area.

Who operates Desert Willow Energy Storage?

Desert Willow Energy Storage is operated by Desert Willow Energy Storage according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Desert Willow Energy Storage generate?

Desert Willow Energy Storage reported 132.2 GWh over the twelve months to 2026-04. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.

Where does Desert Willow Energy Storage connect to the grid?

Desert Willow Energy Storage interconnects at Endeavor Switching Station.

How does Desert Willow Energy Storage compare to other plants?

By capacity, Desert Willow Energy Storage ranks #85 of 962 operating plants of the same technology nationally. It ranks #35 of 223 in TX.

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Desert Willow Energy Storage

A two-hour battery at the 345 kV Endeavor switching station

Desert Willow is esVolta's 150 MW / 300 MWh two-hour battery in Midlothian, Texas.

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ERCOT · Asset profile

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Desert Willow Energy Storage Profile | ERCOT · Ask the Grid

Overview

Storage: 150 MW / 300 MWh
Two-hour owner/EIA basis.
Site: ~13 acres
esVolta exact-project basis.

Infrastructure record

Operator: Desert Willow Energy Storage
Mapped facility footprint: 6.25 mapped acres
Mapped infrastructure geometry associated with this asset.

Profile

Interconnection basis: The SGIA separates 171.36 MVA gross inverter capability, 151.32 MW at the generator terminals, and 150 MW at the point of interconnection.
Financing scope: The disclosed $258 million credit facilities and $243 million investment cover three esVolta projects, not Desert Willow alone.

Structured profile

Developer / owner / operator: esVolta
POI: Endeavor 345 kV Switching Station

Mapped facility footprint

Mapped infrastructure geometry associated with this asset.

6.25 mapped acres.© OpenStreetMap contributors · way/1454374579

Related assets

Similar plants ranked by technology, capacity, and distance.

Sun Valley Storage

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Same typeComparable scale41 mi away

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Chillingham Storage

Batteries · 150 MW

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Same typeComparable scale101 mi away

Compare with this plant

Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
DWES	150 MW 150 MW summer	Batteries Electricity used for energy storage · BA	May 2025	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 CSV

Latest 12 months

132.2 GWh

Reported gross generation

Latest report

Apr 2026

EIA-923 monthly filing

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.

Interconnection record

ERCOT GIS Report

Queue project

Desert Willow BESS

high match · 100/100 · project name, county, capacity

Queue ID / status

23INR0195 · Completed

Point of interconnection

tap 345kV 1906 Venus_S5 - 1916 LiggettA1_5

Interconnecting entity

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.

Parties and identifiers

OrganizationRoleBasis

plant:plant-67598Grid selectionCanonical asset page /assets/facilities/desert-willow-energy-storage.

Reporting portfolio

EIA reporting entity

Desert Willow Energy Storage

Entity 66292

Operating portfolio

1 plants

1 states

Reported capacity

150 MW

Batteries

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

May 2025
May 2025
operating since May 2025EIA-860M Ju...

Sources

PublisherReferenceType

U.S. Energy Information AdministrationEIA-860 generator inventoryFederal registry

U.S. Energy Information AdministrationEIA-923 generation filingsFederal filing

HIFLDAsset record plant-67598Asset source

Desert Willow Energy Storage

Ask about Desert Willow Energy Storage

Desert Willow Energy Storage

Ask about Desert Willow Energy Storage

Overview

Infrastructure record

Profile

Structured profile

Mapped facility footprint

Related assets

Sun Valley Storage

Chillingham Storage

Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Interconnection record

Related parties and identifiers

Parties and identifiers

Reporting portfolio

Timeline and sources

Project timeline

Sources

TE Smith Storage

Connolly BESS

Roadrunner Crossing Energy Storage LLC

Wigeon Whistle Battery Storage Plant

Nearby substations

Common questions about Desert Willow Energy Storage

How big is Desert Willow Energy Storage?

What kind of plant is Desert Willow Energy Storage?

Where is Desert Willow Energy Storage located?

Who operates Desert Willow Energy Storage?

How much electricity does Desert Willow Energy Storage generate?

Where does Desert Willow Energy Storage connect to the grid?

How does Desert Willow Energy Storage compare to other plants?

Co-located assets