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MIT scientists propose power storage using cement blocks
(www.datacenterdynamics.com)
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this post was submitted on 04 Aug 2023
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10kWh is enough to run one 110VAC outlet at full capacity for about 10 hours. I don't know where that 10kWh figure comes from but most American houses use between 15-30kWh per day.
So that 10 foot cube would need to be closer to 15ft cubed. It's huge. Perhaps the foundation of the structure would work, as someone else mentioned.
UK average is 8 kWh / 24 hours for electricity per household of 2.4 people.