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There is enough free energy from tidal, solar, wind and geothermal sources already.

with the exception of geothermal, these are not necessarily 24/7/365 on a local basis.

if there is one missing in certain geographical area, then there is another one to replace it. Also, electricity can be transported to other regions like it is done now.

Agreed, however, as Tesla said, vacuum energy is available anywhere, it is what spawned matter. This potential energy source is inexhaustible and has zero emissions, and unlike many alternatives, it has little embodied energy in the generators and its immense density leads to very little use of land/sea.

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