C2ES held its first Solutions Forum workshop, focusing on market readiness under the Clean Power Plan, in September 2015. More than 40 business leaders, state and city officials, other experts, and representatives from the Environmental Protection Agency (EPA) and the Department of Energy shared their experiences with market mechanisms to reduce pollutants. Discussion focused on cost effectively reducing greenhouse gas emissions while protecting economic growth and driving innovation. This paper summarizes the key insights of the meeting and areas of focus moving forward.