Soldato
Who told you that the "storage or backup supply" is not nuclear?
Nuclear isn't storage for renewables, it also isn't really a "backup supply" as it's not something you can quickly bring back online; rather Nuclear would be your primary source with renewables supplementing it.
As said though, if you can store the energy produced by renewables (wind, solar, geo etc as you've mentioned) then it's possible that it could become the primary power generating source but, you're ****** without storage.
We will get there but it's a case of when.....
Or use a very long pole. Then we can have solar in the thermosphere, above all the clouds.
I think the satellite out of (James Bond) Die Another Day and a PS10-esque installation; power generation and a weapon all in one