You need a little bit (or at least it helps a lot). Al metallization is completely pants, so a few hundred kg of copper and nickel per MW is 'necessary' insofa

You need a little bit (or at least it helps a lot). Al metallization is completely pants, so a few hundred kg of copper and nickel per MW is 'necessary' insofar as ae can't really do it without. Similarly al windings and internal cabling for wind are currently commercially viable, but al alloy undersea cabling is not great and there's some Cu needed in high strength alloys in the gearbox. We could easily get enough for a 2kW per person target by dismantling existing nuclear and coal infrastructure though.