Him and his companies have achieved some very impressive things, most notably Tesla being so far ahead of the pack with EV technology, and Space X with their reusable rockets.
Regardless of your opinion of him as a person, he has achieved some impressive things.
Nuclear is a much more reliable power source, barring a breakdown, you know exactly how much a nuclear reactor will produce at any given time.
Renewables are much more finnicky, and you really need something like hydro, that has a large amount of energy storage, to back it up.