Fourth Power’s take on long-duration energy storage sounds like something out of a James Bond film. The thermal batteries come complete with superheated liquid tin and argon-filled hermetically sealed chambers. The company’s goal, though, is far more prosaic — to store electricity cheap enough to make solar and wind an obvious choice for 24/7 power.
Here’s how the technology works: To store energy, electricity from the grid heats blocks of carbon inside insulated chambers filled with argon gas. When power is needed, the system pumps molten…

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