

I would go a step further and have creative grants to people. It would work in a way similar to the BBC and similar broadcasters, where a body gets government money and then picks creative projects it thinks are worthwhile, with a remit that goes beyond the lowest common denominator. UBI ensures that this system doesn’t have a monopoly on creative output.
Not really enough information. I will assume that by “installed solar power” you mean peak generation when the sun is shining, and that instead of peak use, you mean 40% of average use, i.e. let’s suppose that at an average moment the country consumes 100GW and, if the sun is shining, generates 40GW from solar.
Assume further the sun is up for half the year and the sky is clear for half the year, meaning the total amount of your yearly electricity you can generate with solar is 10% assuming typical weather. Then you would be able to reliably power the country with a combination of nuclear totalling 90% of average use (90GW) and enough storage that you can ride out cloudy periods.