What we may need instead are artificial lake-tiver-dams that are amenable to -pumped hydro- so as to solve the circadian rhythms of solar/wind. By pumping in the day and letting it run downstream in the night we can solve the capacity issue with a natural battery.
You need a large reservoir at the top, another at the bottom, and as much vertical separation as possible. There aren't all that many places in the world that offer the geography necessary. It can be a good solution in places that do have the correct geography, though.
