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Firebricks, designed to withstand high heat, have been part of our technological arsenal for at least three millennia, since the era of the Hittites.
Now, a proposal from MIT researchers shows this ancient invention could play a key role in enabling the world to switch away from fossil fuels and rely instead on carbon-free energy sources.
Then, the price the suppliers get for the power can be close to zero, rendering the plants uneconomical.
But by diverting much of that excess output into thermal storage by heating a large mass of firebrick, then selling that heat directly or using it to drive turbines and produce power later when it’s needed, FIRES could essentially set a lower limit on the market price for electricity, which would likely be about the price of natural gas.
At a later time, the heat could be used directly for industrial processes, or it could feed generators that convert it back to electricity when the power is needed.
The technology itself is old, but its potential usefulness is a new phenomenon, brought about by the rapid rise of intermittent renewable energy sources, and the peculiarities of the way electricity prices are set.
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Distributors determine how much power they expect to need during each hour, and suppliers bid based on their expected costs for producing that power.