Analysis
Antora Energy closed a $550 million Series C round co-led by G2 Venture Partners and Eclipse, valuing the thermal-battery maker at roughly $2.47 billion. New investors including Ribbit Capital, Salesforce Ventures, Activate Capital, John Doerr, Westly Group, StepStone Group, and Liberty Mutual Strategic Ventures joined the round alongside existing backers Breakthrough Energy Ventures, Lowercarbon Capital, Decarbonization Partners, Impact Science Ventures, and Trust Ventures.
Antora's thermal batteries store energy as heat rather than in conventional lithium-ion chemistry, letting heavy industry and data centers draw power from renewable sources even when the sun isn't shining or the wind isn't blowing. The round follows directly on the heels of Antora deploying one of the largest battery storage systems in the world -- a 5 gigawatt-hour installation in South Dakota that went from initial construction to delivering power in under 12 months, an unusually fast timeline for utility-scale energy infrastructure.
The capital will fund a second US manufacturing hub and a more domestic supply chain, positioning Antora to scale production as AI data centers' electricity demand becomes one of the most consequential drivers of new venture interest in industrial energy storage. For climate-tech investors, a $550 million round this size, with a bench of investors spanning traditional VC, strategic corporates, and public-market-adjacent funds like StepStone, signals that energy storage for AI infrastructure has become one of 2026's most credible non-AI-native venture categories. What to watch: whether the second manufacturing hub comes online on schedule, and whether Antora's South Dakota deployment timeline becomes the industry benchmark other thermal-storage players get measured against.
