Center for Resource Solutions (CRS) is a nonprofit organization based in the Presidio in San Francisco, California. It works to promote the retail renewable energy market in the United States by developing consumer-protection programs in renewable energy, greenhouse gas reductions, and energy efficiency. Founded in 1997 by Jan Hamrin, CRS administers the Green-e Climate,^[1] Green-e Energy,^[2] and Green-e Marketplace^[3] certification programs.