Well, first of all, most of North America already has an interconnected grid. So if CA has surplus solar generation, we already get it today.
If we wanted to build a dedicated line so that only the places pumping water to CA were getting the electricity, I am skeptical that the economics work out. I'm sure CA is sunnier than the average east coast state, but enough to cancel out all transmission losses and the higher cost of operating a plant in CA?
