Given Wikipedia's definition Solarpunk fits squarely into the punk ethos:
The punk ethos is primarily made up of beliefs such as non-conformity, anti-authoritarianism, anti-fascism, anti-corporatism, a do-it-yourself ethic, anti-consumerist, anti-corporate greed, direct action and not "selling out".
Comes up on which media? Very often mainstream media like hollywood or video game industry love to coopt the aesthetic of a movement and water down its message.
People often complain that the idea of cyberpunk is being turned from a protest against a dystopian future to a bland scifi style with fog and neon lights.
Instead, The Dispossessed by Ursula K. Le Guin is an excellent example of solarpunk.
