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'World's largest' industrial heat battery runs purely on solar energy

'World's largest' industrial heat battery runs purely on solar energy
Source: interestingengineering
Author: @IntEngineering
Published: 10/17/2025

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Rondo Energy has launched what it calls the world’s largest industrial heat battery, a 100 MWh system now operational at a Holmes Western Oil facility in California. Powered entirely by an onsite solar array, the Rondo Heat Battery stores solar energy during the day and delivers continuous high-temperature heat (above 1,000 °C or 1,832 °F) around the clock, replacing natural gas in industrial processes. Over a 10-week test, it achieved over 97% round-trip efficiency and produces as much heat as 10,000 household heating systems. The system integrates seamlessly with existing gas-fired boilers and steam infrastructure without requiring modifications, enabling industries to reduce carbon emissions and exposure to volatile energy costs. The technology relies on simple, widely available materials—bricks and wires—to store thermal energy, avoiding rare minerals, fire risks, and toxic leaks common in other energy storage methods. It charges for about six hours daily using low-cost or off-grid solar power and then supplies continuous heat

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energyrenewable-energyindustrial-heat-batterysolar-powerdecarbonizationthermal-energy-storageclean-technology