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It would be interesting to have a similar map for submarine power cables. It's early days, but the power grid will eventually go global too.

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How does one transmit power across an ocean? It seems like we are just barely able to send DC across the English Channel with our current technology. Does a global power grid involve super lasers? Or some kind of huge plasma cannon?

We're currently crossing seas, not just the channel. Nice little map with stats here:

https://www.nationalgrid.com/our-businesses/national-grid-ve...

A few years ago I saw a talk by an industrial chemist, long distance power transmission over carbon nanotube cables. Looks like they're still not ready for primetime.

https://en.wikipedia.org/wiki/Carbon_nanotubes_in_interconne...

HVDC can go much further than across the Channel. Suncable is scheduled to go live in 2027. It will connect Australia with Singapore (3350km), the plan being that Australian solar arrays will provide 20% of Singapore's power. The current longest is 2500km [2] inside Brazil.

[1] https://suncable.sg/

[2] https://www.power-technology.com/features/featurethe-worlds-...

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