San Francisco Chronicle: Californians have more than 60 percent of the nation’s solar installations, and more than 66 percent of the state’s solar applications are in Northern California, according to a report released Monday by the Northern California Solar Energy Association, a nonprofit advocacy group. For 2007, statewide there were 50,466 photovoltaic installations, yielding 244 megawatts of electricity, according to the report. The report also tracks energy installations for 165 cities in the nine …