Company executives and analysts alike face a number of difficulties in answering this very important question. To reach the answer requires strong fundamentals in solar PV economics. This, however, is unfortunately not enough. The data necessary to answer the question are difficult to collect and even more difficult to structure and maintain. Further, the data are highly dynamic: US incentives change in structure, decrease or expire and electricity prices change in both magnitude and composition. All of these variables affect a market’s attractiveness, which itself can change substantially over time.