Interesting question. In a solarpunk world I can imagine every type of music but if I have to find a genre with the vibe I'm thinking about indietronica.
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Seconding !music@slrpnk.net but in general I'd associate folk and punk rock because of their protest roots.
I think what's now known as Utopian Scholastic has a particularly solarpunk-y vibe, IMO. You can hear an example here.
Mad Routine is incredibly climate conscious. They regularly upcycle thrifted finds and handmake the majority of their merch. They're also 100% indie, so they avoid these rich corpo labels that prop up industries that are ruining everything. Their fans also care deeply about climate responsibility and hold anti-corporate beliefs, so it's a fun group of people!
GLOBAL PATTERN released several exploratory compilations around solarpunk: https://globalpattern.bandcamp.com/album/solarpunk-a-possible-future
for some reason marimbas or similar?
For me it's Bob Marley, of course.
We have a community for that: !music@slrpnk.net but I don't think there really is a specific music genre for Solarpunk.
Folk? Neofolk? Omnia? Faun?
Thinking Omnia's I Don't Speak Human.