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.
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".