The brief

Analyst view

• Antora's thermal batteries store cheap electricity as heat in carbon blocks, usable for industrial heat or power generation.
• The company commissioned a 5 GWh system at POET's bioethanol facility in May 2026, the largest thermal storage project worldwide.
• Series C funding of $550M (July 2026, $2.47B valuation) will expand production and establish a second U.S. facility.

Technical approach

As reported

Storage

Heat in solid carbon blocks

Electricity converts to heat in insulated carbon blocks at 500-700°C. Heat can power industrial equipment directly or generate electricity.

Duration

Multi-day discharge without degradation

The system discharges over hours or days to match industrial or grid demand patterns without self-discharge losses.

Scaling

Modular 50 MWh units

Each thermal battery module is 50 MWh. Projects build from multiples of this module, scaling gigawatts without redesign.

Cost

Lower capex than long-duration batteries

Carbon blocks and simple mechanics cost less than advanced chemistry, reducing capital cost per MWh.

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