This document discusses gatekeepers of sustainable innovation and Demos Helsinki's Peloton co-creation process. Demos Helsinki is an independent think tank that creates new markets for sustainable consumer businesses. Through Peloton, Demos Helsinki has worked with over 15 gatekeeper groups like builders, retailers, and municipalities to develop new sustainable services. Examples include a new energy expert service from a hardware chain and a low-carbon lunch service from a food company. Peloton also operates a club called Peloton Club to bring sustainable challengers to markets. The goal is to design better existing products and services and also create radically new sustainable lifestyle services around ideas like collaborative consumption.