[cperciva]

Not necessarily. The "strained crystal" approach probably extends to other elements; mixing Pb and Cu works well since there's a large difference in their sizes, but rare earths might work just as well as Pb.

[NoMoreNicksLeft]

Can we get those in volumes necessary to do high voltage lines though?

[amluto]

REBCO tape is just starting to be available in volume, and I don’t think availability is raw materials is even close to being a limiting factor.