Solar energy has become a tangible solution to rising electricity costs and carbon emissions for many Americans. Declining installation prices and solar-friendly policies in many states have led to tremendous growth in rooftop solar installations. In 2013, residential solar photovoltaic, or PV, capacity increased 60 percent over the previous year, reaching 792 megawatts. Today, a new solar power system is installed every four minutes in the United States.
The rooftop solar phenomenon took off in states such as California, Arizona, and New Jersey—the three largest U.S. solar markets—and has been spreading, albeit at a slower pace, to other states. Maryland, Massachusetts, and New York, for example, are developing strong residential solar markets, but the number of residential installations in each state is less than half of the total residential installations in Arizona and New Jersey and less than 10 percent of the total residential installations in California.
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