We have a community for that: !music@slrpnk.net but I don't think there really is a specific music genre for Solarpunk.
Solarpunk
The space to discuss Solarpunk itself and Solarpunk related stuff that doesn't fit elsewhere.
Join our chat: Movim or XMPP client.
Seconding !music@slrpnk.net but in general I'd associate folk and punk rock because of their protest roots.
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!
Folk? Neofolk? Omnia? Faun?
Thinking Omnia's I Don't Speak Human.
GLOBAL PATTERN released several exploratory compilations around solarpunk: https://globalpattern.bandcamp.com/album/solarpunk-a-possible-future
I think what's now known as Utopian Scholastic has a particularly solarpunk-y vibe, IMO. You can hear an example here.
for some reason marimbas or similar?
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.
For me it's Bob Marley, of course.
For festivals, Electric Forest and Tomorrowland feel the most solarpunk to me