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Rooftop solar panels make a lot of sense for L.A., not only because the city is so frequently sun-splashed but because local power development is the easiest and cheapest way to reduce reliance on fossil fuels, since one doesn't need to build power lines to carry electricity here from desert solar plants or mountain wind farms. Compared to other cities, though, L.A. is lagging.

You might not realize it on a foggy winter morning, but Sonoma County cities are really soaking in the sun. A new study shows the county has one of the highest concentrations of solar energy users in the state.