[dTal]

You can invert this and say that solar/wind would be utterly terrible at "filling in the last part" of a nuclear-dominated grid.

The inability to generate constant, reliable power is a weakness, not a strength.

[pfdietz]

Right. It's one or the other generally (although some solar could help nuclear if demand peaks on sunny days).

However, unless nuclear gets a lot cheaper, it's looking like the nuclear dominated grid is going to be more expensive than the renewable dominated grid, even taking the cost of intermittency into account.