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Firebrick thermal energy storage could reach 170 GW in the U.S. by 2050
(pv-magazine-usa.com)
This is a most excellent place for technology news and articles.
They're not converting it back into electricity, this is for industrial process heat. They have 100 units of electrical energy and 98 units go into whatever the industry needs to heat.
Lots of industries use ovens, kilns or furnaces. Mostly fueled by gas at the moment. Using electricity would be very expensive unless they can timeshift usage and get low spot prices. Since they need heat anyway, thermal storage is pretty cheap and efficient.
Oh, my bad. That makes perfect sense and I have no objections for purely thermal storage.
It said steam to customer, my brain filled that in with turbine.