Depends on quite a bit more than the temperature. What about the cost? Max power handling? Maximum magnetic flux?

Sure if it's cheap you could do fun things like have a solar powered grid so what any sunny place on earth could provide power planet wide. Thus any natural peaks and valleys world wide would mostly average out. That way instead of designing your power grid for the worst case (something like sunset of the hottest day of the year) you can balance the northern hemisphere with the southern (with generally opposite weather).

It also could potentially make for "perfect" batteries, which could revolutionize various industries. Unfortunately zero resistance does not imply infinite power density.