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Same concept as using rail cars.
https://s3.amazonaws.com/siteninja/m...S_-_101217.pdf
Central storage areas would work for highly populated areas.
Outside of populated areas, individual systems could be developed.
For instance, a chimney like structure could be added to a home with a
winch-motor-generator and a large weight. (Concrete or water)
Many years ago, I think it was Popular Science. Had a article that proposed putting a large concrete flywheel in the basement of a home for energy storage.
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