Benefiting from the renewable energy incentive policies of the US state governments, more and more Americans install solar energy on their roofs, which has brought the US solar power generation to a new level and promoted the United States to become one of the world's largest solar power generation countries.According to the American media "Salon" report on December 10, the American Solar Energy Industry Association stated that in the third quarter of 2013, a total of 31,000 American households installed solar panels on their roofs. If public utility projects are included, the new solar power generation in the United States will reach 930 MW, an increase of 35% over last year. According to this trend, solar power generation in the United States will double again.The growth of solar power generation in the United States is mainly driven by large-scale photovoltaic projects. However, the installation of residential solar power equipment has grown rapidly, with an increase of 49% in 2012 alone. The increase in residential solar power generation is attributable to the country's incentive policies for renewable energy. Several states with large solar markets have introduced relevant incentive policies, including California, Arizona, North Carolina, Massachusetts, and Nevada. By the end of 2013, individual residential solar projects will reach 400,000, and the power generation capacity will reach 10GW. This means that the United States has surpassed Germany, the world champion of solar power generation, for the first time in 15 years. However, this result is also due in part to the European Union's cut in government subsidies for solar power generation.