Holly Lisle, author of the Moon and Sun Trilogy, containing The Ruby Key and The Silver Door, is finally able to write the third book! The Emerald Sun. She has been working on it since last year and if you check her blog she has been making steady progress. Tho she might share spoilery little details and I didn't want to be too spoiled. I haven't read these books in like 10 years. Tbh I'm hoping they aged well... This was one of my all time favorite series as a kid/youth.
Sunbeam City is a Libertarian Socialist solarpunk instance. It is ran democratically by a cooperative of like-minded individuals.