Antora raises $550 million for US-made thermal battery storage

Antora Energy has raised $550 million in a Series C funding round that saw the US energy storage company secure capital from new and existing investors.

The funding announcement quickly follows the company’s deployment of a 50 MW/5GWh thermal battery project in South Dakota. Antora deployed over 200 thermal batteries at POET’s Big Stone City bioprocessing facility, delivering the project from initial construction to commissioning in under 12 months.

Antora’s thermal batteries work by storing electricity as heat in insulated blocks of solid carbon. The batteries are built at a factory in San Jose, California, which was expanded in spring 2026 with the addition of two new facilities – doubling manufacturing capacity, according to Antora.

Funds raised in the latest financing round will allow Antora to deploy more projects, more quickly, according to Nehali Jain, the company’s VP of strategy and growth. Antora plans to invest in further production capacity expansion, which will include establishing  a second US manufacturing facility.

The funding round was co-led by G2 Venture Partners and Eclipse, with participation from new investors including Ribbit Capital, Salesforce Ventures, Activate Capital, John Doerr, Westly Group, StepStone Group, and Liberty Mutual Strategic Ventures. Existing investors also contributed to the round, including Decarbonization Partners, Impact Science Ventures, Trust Ventures, Breakthrough Energy Ventures, and Lowercarbon Capital.

“From factories to data centers, energy is the bottleneck to industrial growth,” said Andrew Ponec, co-Founder and CEO of Antora. “Antora has shown we can help break that bottleneck—delivering energy fast, at massive scale, with American innovation. With this funding round, we’re continuing to strengthen our investment in U.S. manufacturing, delivering affordable energy across the country and around the world.”