There’s a nifty project on Mastodon where someone is running an instance entirely on solar (and I think a battery?). They’ve been tinkering with some of the code to do things like optimise images for reduced weight of CPU cost.

The project is called @solaradmin@solarcene.community and the account for the person running it is on a separate instance, presumably so petiole can message them about problems: @smallsolar@techhub.social.