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A comment on Stacking concrete blocks is a surprisingly efficient way to store energy. Parent comment

Re:Stacking concrete blocks is a surprisingly efficient way ... by gammarator on Saturday August 18, 2018 @09:51PM (#17792068)
Doesn't seem to have worked out so well for Lightsail Energy... http://energystoragesense.com/uncategorized/lightsail-anothe...
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