San Marcos, UNITED STATES
A home with solar panels on its roof is shown in a residential neighborhood in San Marcos
A home with solar panels on its roof is shown in a residential neighborhood in San Marcos, California September 19,2013. Well over 60 percent of solar systems in states like California and Arizona today are owned by a third party and financed, allowing homeowners to go solar by paying a monthly fee for panels instead of shouldering the $20,000 to $30,000 up front cost of a system. Photo taken September 19, 2013. REUTERS/Mike Blake (UNITED STATES - Tags: ENVIRONMENT REAL ESTATE BUSINESS)