What about Antora Energy closed a $550 million Series C on July?

Antora Energy closed a $550 million Series C on July 30, 2026, co-led by G2 Venture Partners and Eclipse, pushing its total funding past $1 billion.

What about Antora's thermal batteries store electricity as heat in solid carbon?

Antora's thermal batteries store electricity as heat in solid carbon blocks heated resistively to 2,400C, then convert it back to electricity or process heat through a thermophotovoltaic system.

What about Antora's 50 MW / 5 GWh system for POET's Big?

Antora's 50 MW / 5 GWh system for POET's Big Stone City bioprocessing plant in South Dakota went from construction to commissioning in under 12 months.

What about Antora manufactures its batteries at a three-building campus in San?

Antora manufactures its batteries at a three-building campus in San Jose, California, and doubled manufacturing capacity in spring 2026.

What about New investors include Ribbit Capital, Salesforce Ventures, and John Doerr;?

New investors include Ribbit Capital, Salesforce Ventures, and John Doerr; existing backers Breakthrough Energy Ventures and Lowercarbon Capital also returned.

Antora Closes $550 Million Series C for US Thermal Battery Storage

C&I Storage Energy Storage News
Marin Holt
August 5, 2026
0
196
4 minutes read

Antora Energy closed a $550 million Series C on July 30, 2026, co-led by G2 Venture Partners and Eclipse, pushing its total funding past $1 billion.
Antora's thermal batteries store electricity as heat in solid carbon blocks heated resistively to 2,400C, then convert it back to electricity or process heat through a thermophotovoltaic system.
Antora's 50 MW / 5 GWh system for POET's Big Stone City bioprocessing plant in South Dakota went from construction to commissioning in under 12 months.
Antora manufactures its batteries at a three-building campus in San Jose, California, and doubled manufacturing capacity in spring 2026.
New investors include Ribbit Capital, Salesforce Ventures, and John Doerr; existing backers Breakthrough Energy Ventures and Lowercarbon Capital also returned.

Antora Energy closed a $550 million Series C round on July 30, 2026. The funding will expand thermal battery manufacturing and deployment across the United States. G2 Venture Partners and Eclipse co-led the round. The raise brings Antora total funding past $1 billion.

What Is Being Built

Antora batteries store electricity as heat in solid carbon blocks. Resistive heating charges the blocks to temperatures up to 2,400 C. A thermophotovoltaic system converts light from the hot carbon back into electricity. It can also deliver heat directly to an industrial process. The design stores energy for multiple days, not just hours, to match steady industrial demand.

Antora builds the systems at a three-building campus in San Jose, California. The company doubled its manufacturing capacity in spring 2026. It has deployed more than 200 thermal batteries. Its largest project so far sits in South Dakota. It is a 50 MW, 5 GWh system built for the POET Big Stone City bioprocessing plant. That system went from construction to commissioning in under 12 months.

Why It Matters

Antora targets factories and processing plants that need constant heat or power. Those sites cannot wait years for a new gas connection or transmission upgrade. A 5 GWh system paired with an existing industrial site skips the interconnection queue. That queue stalls new generation in many regions.

New investors in the round include Ribbit Capital, Salesforce Ventures, and Activate Capital. John Doerr, Westly Group, StepStone Group, and Liberty Mutual Strategic Ventures also joined. Existing backers Decarbonization Partners, Impact Science Ventures, Trust Ventures, Breakthrough Energy Ventures, and Lowercarbon Capital returned too. Antora plans to use the funds to build large projects, expand production, and open a second US manufacturing hub.

CEO Andrew Ponec said energy has become “the bottleneck to industrial growth.” He framed the round as a way to deliver power fast and at scale from domestic manufacturing.