Aluminium is almost as good by cross section, much cheaper, and the global (mainly Chinese) production is sufficient for a global (40 megameter) multi-terrawatt power grid every 18 months or so.
And yes, I did do the maths; and also yes it's really just China at the "global terrawatt" scale (they've become a dominant aluminium supplier), but a much smaller distance and power rating is probably fine even if China doesn't sell you the metal.
And yes, I did do the maths; and also yes it's really just China at the "global terrawatt" scale (they've become a dominant aluminium supplier), but a much smaller distance and power rating is probably fine even if China doesn't sell you the metal.