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I wonder how much more energy this setup would store if they added cranes. Also it could be possible to make a circular vacuum maglev train out of these and add energy to it by accelerating.

There was an episode of Nova about energy storage that included a company that made kinetic energy storage devices. IIRC they had 5000 pound flywheels that spin in a vacuum and can be installed in your home. Expensive to purchase and install but essentially unlimited lifespan and totally renewable.

I've heard about either a working system, or a calculation of something like that but with regular trains. Long story short, it can't actually store that much energy.

More efficient (and less mechanically complicated) would be pumping water up a hill into a lake.

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