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Old 06-05-2019, 04:34 PM
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What this thread needs, for ignorati like me, is a brief list of storage methods other than battery with efficiency figures. (Sure, speak of a Manhattan Project for best battery, but let's review other approaches.)

Pumping water upward near hydro-electric power stations? What is the efficiency there as a percent?

How does net efficiency of hydrogen compare with batteries? What if the hydrogen need not be transported or compressed? What other local energy storage methods make sense?

How do big power systems store energy at present, or do they?

Last edited by septimus; 06-05-2019 at 04:35 PM.