I've played Eco Mofos, it was interesting. Leans heavily on the punk part. The system is OK to good. Gets in your way sometimes, but it might have been everyone's inexperience with it.
Fully Automated! Solarpunk RPG
Those are the only 2 of I know of and have a little experience with. Dreams and Machines is, in my opinion, more solarpunk-ish than really thoroughly solarpunk.
Have you tried simply searching the sites for what you want?
Itch.io has user curated, searchable lists of games.
This is just the first such list that appears in a simple search for "solarpunk". Solarpunk TTRPGS
.........did you even look for yourself before coming here and asking someone to do it for you?
Chill, bruh. This is literally a comm for asking what games to play. This is a fine question.
I checked and I thought that someone would have a recommendation. Something they liked. Something they have a feedback to give.