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Solar technology, solar markets, and the solar industry have changed dramatically over the past five years. Cumulative U.S. solar deployment has increased more than tenfold, while solar’s levelized cost of energy (LCOE) has dropped by as much as 65% (Figure 1). As a result, today the solar industry is about 70% of the way towards achieving the Initiative’s 2020 goals. New challenges and opportunities have emerged as solar has become much more affordable, and we have learned many lessons as solar technologies have been deployed at increasing scale in the United States and abroad. The On the Path to SunShot series explores the remaining challenges to realizing widely available, cost-competitive solar in the United States.