[LewisMumford]

> there’s a -punk there, and not just because it’s become a trendy suffix. There’s an oppositional quality to solarpunk, but it’s an opposition that begins with infrastructure as a form of resistance.”

> Green, sustainable infrastructure as a form of resistance. Technical systems decoupled from the ‘authoritarian technics’ that Mumford warns us about. The embracing of the natural and the technical. This idea is where the solarpunk vision really comes into its own.

Seems to be mentioned in the article why there's a punk suffix. I think it fits. This kind of thinking is inherently subversive to the power structures in place in our societies today.