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Why are you quoting AC systems when such a system would certainly be DC? According to Wiki a UHVDC system has losses of 2.6% per 800 km leaving us with a total loss of about 10%.

https://en.wikipedia.org/wiki/High-voltage_direct_current#Ad...

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China built a 1100 kV / 12 GW line with losses of 1.5% per 1000 km. I have no idea if that's cost effective or not.

https://asian-power.com/power-utility/news/chinas-thermal-co...

Yes it's the world's most advanced and also unique tech which they designed specifically for their needs.

I do not see what it would not be cost effective for the amount of power it would be used. To power entire world with solar we would need solar installation size of Spain or bit less in Sahara, and to connect about 2000km cable over Algeria–Morocco i really do not see the issue, and that does not include current wind solar installations.

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