I only watched a few minutes of this video and stopped because it is too ill informed about solarpunk. Maybe it gets better, but the intro made me think that it is not worth my time.
Solarpunk is on the anticapitalist spectrum. The projects portrayed in this video as solarpunk are most certainly not. They are part of the greenwashing of eco-capitalist approaches.
Edit: If anyone would be interested to understand what solarpunk is and were it stands, andrewism would be a good starting point
The answer to this is a bit nuanced since solarpunk is not a political movement per se. Still, to reply to your question as best as I could say through political approaches like social ecology and anarchy, but I wouldn't want to restrict it.
For more on this, check out the 2 links in my previous comment.