Just because you can't think of a solution does not mean others have not already thought of solutions. Rooftop solar for example. Doesn't work for all buildings

Just because you can't think of a solution does not mean others have not already thought of solutions. Rooftop solar for example. Doesn't work for all buildings, but we are talking about the aggregate effect on the grid, which it does work for in most locales. In other locales, there are other solutions. You mention hydrogen. Pretty corrosive and explosive stuff, but maybe.