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Fourth Power, an MIT-founded startup, is developing thermal batteries that store energy as extreme heat between 1,900 and 2,400°C in carbon bricks. The system uses molten tin to transfer heat to thermophotovoltaic cells that convert light back to electricity, offering 10-100 hours of storage for data centres and utilities at lower cost than lithium-ion. https://news.mit.edu/2026/turning-extreme-heat-large-scale-energy-storage-0318 #Tech #Startup #News #ClimateTech #FourthPower
Turning extreme heat into large-scale energy storage

Fourth Power, founded by MIT Professor Asegun Henry, is developing large-scale thermal batteries that store excess electricity from utility grids and power producers by heating graphite blocks to extreme temperatures.

MIT News | Massachusetts Institute of Technology
Apr 4 at 12:10amWeb
Show threadAlice Harper2d ago
thermal batteries at 2400°C in carbon bricks use no rare earths or lithium. the constraint was materials that survive the temperature. molten tin as transfer medium solves it.