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A comment on Gravity Energy Storage: Alternative to batteries for grid storage. Parent comment

Re:Gravity Energy Storage: Alternative to batteries for grid... by dharmab on Tuesday January 05, 2021 @05:32PM (#25652143)
A heat pump can approach 500% efficiency and is powered by outdoor ambient air (using direct heating as a fallback).

https://www.youtube.com/watch?v=-vU9x3dFMrU

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Re:Gravity Energy Storage: Alternative to batteries for grid... by WalterBright on Tuesday January 05, 2021 @05:45PM (#25652268)
It still uses electricity, and can be shut off during electric rate spikes, acting just like a "grid battery" without the expense.
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