Holmes Western heat battery

OPERATINGSAVE + ADD TO THESIS

Rondo Energy · Kern County, CA · California DEVELOPER HEALTHWATCH

100 MWh brick thermal battery charged by a 20 MW solar array, making steam for oil production.

Long-duration storage · Multi-day, thermal and mechanical storage SEE CONNECTIONS →

ANNOUNCED
DEVELOPMENT
PERMITTED
FINANCED
CONSTRUCTION
OPERATING

Power

—

Long-duration storage · First commercial

Storage

100 MWh

energy capacity

Online

Oct 2025

actual

Capital committed

—

closed or awarded

Capital pending

—

conditional or under review

How it works

Thermal

Cheap electricity heats bricks or carbon blocks to well over 1,000°C. The stored heat comes back out as factory heat or steam hours later.

OPEN IN 3D →

Others on this approach

Capital stack

0 SOURCES

No project-level financing disclosed yet.

Milestones

Oct 15, 2025Commercial operation
Oct 16, 2025Commercial operation: 100 MWh heat battery charged by onsite solar

Grid, permits and build

Grid connection, permits, contractors and cost not researched yet for this project.

Who buys and who finances

Holmes Western Oil Corp.

Customer-owned; replaces a gas boiler

Holmes Western Oil Corp.HOST · BUYER

Dependencies

SUPPLY CHAIN →

Policy that applies

LOADING…

Holmes Western heat battery

Thermal

Capital stack

Milestones

Grid, permits and build

Who buys and who finances

Dependencies

Holmes Western heat battery

Thermal

Capital stack

Milestones

Grid, permits and build

Who buys and who finances

Dependencies

Related

Sources