Comment on 'Never-before-seen material' can store vast amounts of energyparentComments−eru16yIndeed.What comes close, if you do not care about moving around with energy stored in it and safety at the same time, is the humble fly-wheel.−hugh316yAlso as long as you don't care about energy leakage -- no matter how good your bearings are, they're imperfect. Flywheels store energy for minutes or hours, batteries for days or weeks, non-volatile hydrocarbons for millions of years.
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Indeed.
What comes close, if you do not care about moving around with energy stored in it and safety at the same time, is the humble fly-wheel.
Also as long as you don't care about energy leakage -- no matter how good your bearings are, they're imperfect. Flywheels store energy for minutes or hours, batteries for days or weeks, non-volatile hydrocarbons for millions of years.