For a brief moment, environmental activists, energy companies, and government officials worked side by side to promote sustainable energy. In 1998, Greenpeace and Shell launched the successful Solaris campaign to convince homeowners in the Netherlands to install solar panels on their roofs. As the partnership collapsed in the early 2000s, the increasingly adversarial relation between climate activists and energy companies built on the legacy of this collaboration between Greenpeace and Shell. The history of the Solaris campaign highlights how climate activism emerged through collaboration as much as through opposition between environmentalists and energy companies. The unexpected twists and turns of their relationship present an opportunity to consider a contingent history of the Anthropocene.