As long as we are going there, backing a traditional nuclear power plant with a reservoir for pumped storage would work as well. But the land needed for such is immense and limited (though great for recreation opportunities). Nuclear could also be coupled with a desalinization plant that would use excess energy to produce clean water for later use (but there are other challenges there).

If liquid hydrogen fuel was ever useful, it could produce that with excess capacity also (but again, other issues).