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Long-term storage of energy is a difficult technical problem that limits the usability of renewable sources of energy to replace traditional fossil fuel sources

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Can a water vortex (whirlpool) be used to efficiently store energy?

Yes, this would be horribly inefficient compared to pumped hydro or even a regular flywheel. With a rotating fluid, there's a lot of viscosity. This viscosity generates heat and slows the fluid down …
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