FormulaNova said..
It would be nice to have an interconnect between east and west, but I guess the cost would probably outweigh any advantages.
Q>1.Is copper what they would use? Steel? Aluminium?
A.-I think the is top secret, so nobody could copy their technology. We could not just made our own UHVDC. We need to buy a patent or pay royalties for every electron sent on network.
Q>skin effect?
Ai am almost sure the touching that 1.2MV cable may have adverse effect on your skin > (haha

, I know , you refer to ultra high frequency current, But in fact there is more to think about in your question!!!

Indeed , high voltage should cause electrostatic repulsion ! I am not sure how it works inside conductor , needs more reading and learning


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Q.It would be nice to have an interconnect between east and west, but I guess the cost would probably outweigh any advantages.
A. Lets do this weight comparison then>
a) weight of copper per kg against unlimited output from all potential green energy sources: wind , tidal, solar, hydro , attached storage- available to anybody across Australia. From everybody willing to sell to everybody willing to buy and pay for it.
We no longer need to shut down aluminium processing plants because of the lacking electric power.
We don';t need to sell cheap hydrogen to Japan because we could make something worth here.
We always could send excess of energy across ocen to Singapore buyer.
All this above only possible on DC not AC network.
BUT that assurance can not come from MACRO here on SB.We need to hire highest degree expert overseas, to tell you the same in the complex language that you don't understand but trust fully.