engines compress and heat air with a fuel suitable for an . For example, burning natural gas or heats compressed air, and then a conventional engine or the rear portion of a expands it to produce work. can recharge an . The apparently-defunct [pdf]
Imagine storing electricity in an underground balloon—that’s essentially what compressed air energy storage (CAES) does. This technology converts excess electricity into compressed air, which gets stored in underground salt caverns or artificial chambers. [pdf]
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