What happens when a society fucks up? (Look to Windward)

What happens when the society faces a serious problem and factions develop? (Excession)

What happens if two functional but very different Solarpunk societies meet (Say an ancom group building FALGSC with every piece of tech it can and a heavily Ecosocialist group with some primativist leanings?) (The Cassini Division)

How does the society defend itself? Internally and Externally. (The Commonweal Series)

The good old Outside Context Problem ("a wild Yog Sothoth appears, he wants to marry your leader") (Excession again)

"The discontent" (Consider Phelbas)

"Solarpunk goes on a space adventure" (too many to list)

Easy stuff. There's all the classics. Humanity vs the elements, humanity vs themselves, humanity vs society.

A good story to tell would be, say, an Anarchist society brushing up against a 'raider' society. They want your stuff, and they're willing to kill you for it. How do you deal with that? Is killing them back the right thing to do? Or should you try to rehabilitate individual members?

There's so much you can dig into, it's great. Of course you could say that Solarpunk is 'utopian' only, but that's like saying that Capitalist stories can only be 'utopian'. Even ones with rosey views of Capitalism have worries and threats to deal with.

Don't let yourself be hung up on how everything has to be perfect. Have good people striving to come together to have a good society against an unforgiving cosmos.

And remember to shove in as much praxis as possible!

Check out Kim Stanley Robinson's work. I've only read Mars Trilogy, but they feature utopias or are building utopias with many solar punk elements.

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Red Star by Bogdanov (Bolshevik, heavily inspired Kim Stanley Robinson's Mars Trilogy) is a great example of this. It's about a communist society on Mars fighting against desertification and climate change. Man vs environment, if you will. There's factions, intrigue, and is very compelling stuff.