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A comment on Goldman Sachs invests $250M in compressed air energy storage. Parent comment

Re:Goldman Sachs invests $250M in compressed air energy storage by count on Wednesday January 12, 2022 @01:14PM (#29910696)
They don't need to be air/water tight for long term, just tight enough with a known leakage factor.
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Re:Goldman Sachs invests $250M in compressed air energy storage by edzillion on Wednesday January 12, 2022 @04:46PM (#29913138)
But how cheap is it to determine the leakage factor? I suppose they can just pour in the equivalent water and see if it leaks?
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