In some ways Solarpunk is the opposite of Cyberpunk.
If solarpunk is the sun, then cyberpunk is the moon (with a secret base built by a megacorporation)
If cyberpunk is dark, gritty streets in the slum, then solarpunk is bright rooftops (with plenty of community-owned solar cells and gardens)
In other ways, they're exactly the same.
Solarpunk is what happens when the cybrepunks win.
Cybrepunk is what happens when the solarpunks stop fighting.