There's a no-entry-fee $5000 contest running partly through MIT for new SF under 6000 words which imagines plausible positive futures. Lots of solarpunk fits under this umbrella. Go enter!
protopianprize.com/contest-rules
The Protopian Prize is a fiction contest inviting you to share your
vision of people working toward liberatory futures, meeting obstacles,
and making real change. “Protopian”—a word coined by Kevin ...