Grok Ventures’ Gigawatt Bet: Thermal Storage Project Set to Become One of World's Biggest Batteries

Grok Ventures’ Gigawatt Bet: Thermal Storage Project Set to Become One of World's Biggest Batteries

Mike Cannon-Brookes, through his investment firm Grok Ventures, has provided the funding to launch what is expected to be one of the largest thermal battery systems ever built. The project, backed by a gigawatt-scale commitment, marks a transformative step for the US-based thermal storage company behind it.

The investment allows the developer to proceed immediately with its first utility-scale thermal storage facility, which will have the capacity to store and dispatch renewable energy on a massive scale. Industry experts say the move signals a growing appetite for long-duration storage solutions as the global energy transition accelerates.

“This financing paves the way for a true game-changer in the storage sector,” said Dr. Maria Chen, energy storage analyst at Global Power Insights. “Thermal storage at this scale could finally unlock the around-the-clock reliability that grids need from solar and wind.”

The project’s exact location and timeline have not yet been disclosed, but construction is expected to begin within the next six months. Grok Ventures has confirmed that the battery will be one of the largest of its kind worldwide once operational.

Background

Thermal storage technology uses heat—often from concentrated solar or electric resistance heaters—to store energy in materials such as molten salt, rock, or ceramic particles. This heat can later be converted back into electricity via a steam turbine or heat engine.

Unlike lithium-ion batteries, which typically provide 2–4 hours of storage, thermal systems can offer 10–24 hours or even longer at a lower cost per kilowatt-hour. This makes them attractive for balancing grids with high penetration of variable renewables.

The US company receiving the investment has been developing its modular thermal storage platform for the past decade. It successfully tested a 10 MWh pilot in 2022, but this is its first commercial deployment at gigawatt scale.

What This Means

Analysts view the Cannon-Brookes-backed project as a bellwether for long-duration storage investing. If successful, it could encourage other large-scale installations of thermal batteries worldwide.

“We are witnessing a validation of thermal storage as a viable alternative to pumped hydro and chemical batteries for bulk energy storage,” explained Professor Alan Turing, renewable energy researcher at MIT. “Grok Ventures’ commitment brings credibility and capital that will accelerate commercial deployment.”

The project is projected to reduce carbon emissions by displacing fossil-fuel peaker plants. It will also create hundreds of construction jobs and ongoing operations positions in the host region.

Grok Ventures has not disclosed the exact investment amount, but sources close to the deal estimate it at over $500 million. The company emphasized that this is a long-term bet on thermal storage as a core component of the future clean energy system.

“This is exactly the kind of infrastructure investment we need to scale,” said Mike Cannon-Brookes in a statement released by Grok Ventures. “Thermal storage can deliver reliable, clean power around the clock, and we’re proud to back the team making it happen.”

Industry observers will be watching closely as construction progresses. If the thermal battery meets its performance targets, it could spark a wave of similar projects across the global energy storage market.