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A comment on How Water Heaters Have Evolved into Grid-Scale Energy-Storage Devices (2014). Parent comment

Re:How Water Heaters Have Evolved into Grid-Scale Energy-Sto... by pofilat on Sunday January 27, 2019 @11:24AM (#19012282)
You are describing charging a battery: https://www.tesla.com/powerwall

Also, see Gravity battery: https://news.ycombinator.com/item?id=17789456

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