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While it's physically possible it's likely not economical to setup a full global network.

What is more likely is projects like

https://www.energymagazine.com.au/milestone-for-nt-solar-far...

Where neighbouring countries share generation and consumption (lots of western European countries already do this)

In Bits and Pieces. Isn't that how the Internet grew?

Those that have more pressing needs or have more aligned opportunities will invest first, then the cost goes down as the scale and technology improves, and the global network is built.

Geopolitics might be a big stumbling block though.

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