Pais also patented a 'room temperature' superconductor:
Piezoelectricity-induced Room Temperature Superconductor
Abstract
The present invention is a room temperature superconductor comprising of a wire, which comprises of an insulator core and a metal coating. The metal coating is disposed around the insulator core, and the metal is coating deposited on the core. When a pulsed current is passed through the wire, while the wire is vibrated, room temperature superconductivity is induced.
TANSTAAFL, Anon. There is always a cost.
Not 'free energy' - at least initially. Less energy expended or lost in transmission. Lower line loss in conventional distribution models:
Transmission & Distribution network, here are the average values of power losses at the different steps*:
1-2% – Step-up transformer from generator to Transmission line
2-4% – Transmission line
1-2% – Step-down transformer from Transmission line to Distribution network
4-6% – Distribution network transformers and cables
The overall losses between the power plant and consumers is then in the range between 8 and 15%.
https://blog.se.com/energy-management-energy-efficiency/2013/03/25/how-big-are-power-line-losses/
Potential impacts:
https://www.azom.com/article.aspx?ArticleID=19397