Affordable reliable electricity is a central pillar of modern life. At the same time, the generation of electricity is responsible for nearly 40 percent of U.S. carbon dioxide emissions. Advances in technology and environmental policy are driving enormous change in the power sector, which will alter its ability to provide affordable and environmentally-sustainable electricity for decades to come. The Center for Climate and Energy Solutions (C2ES) has gathered input from a diverse group of business, labor, consumer, and environmental experts to develop a set of scenarios describing the extent to which U.S. electricity in 2030 could be affordable, reliable, safe, and environmentally sound. By articulating the challenges and opportunities that the next few years may bring, C2ES hopes to equip the stakeholders to better address them.