This system stores energy by squeezing air into a tank at extremely high pressures, specifically above 225 bars. When energy is needed, the compressed air is heated by a special unit containing a material that stores heat, making the process of turning the air back into power much more efficient. The entire system, including the tank and heat exchanger, is designed to handle these very high pressures.
Why it matters: Advances in high-pressure material science and manufacturing techniques could make the specialized tanks and heat exchangers more feasible. Improved latent heat storage materials may also enhance the system's thermal efficiency since 2015.
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