Comment by cinntaile

I don't get why you're feeling so attacked? I'm just citing the numbers. UHVDC is defined as >=800kV

> "HVDC transmission has typically 30-50% less transmission loss than comparable alternating current overhead lines. (For comparison: given 2500 MW transmitted power on 800 km of overhead line, the loss with a conventional 400-kv AC line is 9.4%; with HVDC transmission at 500 kV, it is only 6%, and at 800 kV it is just 2.6%.)" [1]

There are quite a few of UHVDC lines in China, not much in the rest of the world. [0] I don't know what they cost, but maybe you can estimate it based on what they decided to invest over a 10y period.

[0] https://en.wikipedia.org/wiki/Ultra-high-voltage_electricity...

[1] https://web.archive.org/web/20180730045905/https://www.sieme...