Fourth Power vs Antora Energy
Side-by-side comparison of AI visibility scores, market position, and capabilities
Raised $45M total including $20M Series A (Munich Re Ventures, DCVC, Breakthrough Energy). Integrated demo unit completing 2026. Targets 10x cheaper storage than lithium-ion.
About
Fourth Power is an MIT-originated thermal energy storage company that stores electricity as heat in graphite blocks at 2,400°C — using molten tin as a heat transfer medium and converting stored heat back to electricity via thermophotovoltaics (TPV). The company has raised $45 million including a $20 million Series A from Munich Re Ventures, DCVC, and Breakthrough Energy Ventures, and is completing its full integrated demonstration unit in 2026.
$272M total raised. Commercial-scale thermal battery deployments launching in 2026. DOE-backed cement consortium (1.1M tonne CO2/yr reduction). Heat-as-a-service model.
About
Antora Energy builds carbon-block thermal batteries that store cheap renewable electricity as ultra-high-temperature heat (up to 1,500°C), then deliver industrial process heat on demand — displacing natural gas in hard-to-abate sectors like cement, steel, and chemicals. The company has raised $272 million in total funding and is launching its first commercial-scale deployments in 2026, integrated into a DOE-backed cement industry consortium targeting 1.1 million tonnes of CO2 reduction per year.
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