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credit_guy 5 days ago

This is a fairly elegant idea. But it's definitely not "long term storage" as they claim it to be. A long-term storage solution that only holds energy for 8 hours is quite useless. Also, a long-term storage solution needs to be proportionally less expensive than a short term one in order to be equally profitable. For example, if you charge-discharge a lithium battery on a daily basis, and you use any long term solution to charge-discharge every 100 days, then the second needs to be 100 times cheaper if you want to get the same profit, because you sell the electricity only once vs 100 times for the battery. But this solution claims to be only slightly less expensive than lithium batteries, certainly not by a factor of 100. Not even by a factor of 2.