I can't give you the magic number that it's feasible over. It depends upon the distance, the amount of electricity, what the geography is, how many different jurisdictions you have to go through, how many regions, and how many first nations or indigenous claims you have to go through. That all weighs into it. Obviously, it's easier to build something across a relatively flat prairie, let's say, than it is going across the shield or the mountains. Those are some of the challenges.
I don't really have a magic number. You also have to balance out what the other generation sources are that you'd be replacing.