Solarpunk

well if it was a 1:1 replacement with zero growth it will be fine;

The problem is the goal economy is structured around a 10% per year (compounding) growth rate in energy use; which means we have a rather short doubling time. And it only takes 120 doubling before we exceed the total energy of the sun and long before that the Earth would be hotter than the surface of the Sun. (Even if we removed 100% of all green house gases and blocked out the Sun entirely and distributed pure electricity only)

That being said if we build a Dyson Sphere and do some Star lifting to convert it to a white dwarf star https://www.youtube.com/watch?v=pzuHxL5FD5U

and cut our growth rate significantly, we might be able to have a civilization of growth for about a billion years.

Short- and medium-term, anything that leads away from fossil fuel is a good thing. Long-term, though, it seems like taking energy that would normally have bypassed the Earth, capturing it, and then adding it into our ecosystem is probably a bad idea. I'm a total layman, here, though, mostly going off of what I've read in science fiction.

Also, yeah, the weapons potential is a problem, though I sort of feel like we've already got all the weapons we need to intentionally eliminate human life, so further refinements don't matter much. It's the accidental extermination we're worried about, and this might help with that for awhile.