The Smart Electric Power Alliance’s (SEPA) recently released 2015 Solar Market Snapshot reports that total U.S. solar capacity reached 22.5 gigawatts AC (more than 25 gigawatts DC) last year. The amount of solar on residential rooftops across the country increased 50 percent, and the number of residential solar projects made up 97 percent of installations. However, utility-owned solar projects continue to deliver the most capacity — nearly 3,500 megawatts AC in 2015, compared to 1,800 megawatts AC for residential.