Solar power, which makes up a tiny part of California's overall energy mix, will account for the biggest piece of the state's renewable energy pie by the end of the decade, according to the state's largest utilities, says Dana Hull of MercuryNews.com. Last year, Pacific Gas & Electric (PG&E) got most of its renewable energy from wind, bioenergy, geothermal, and small hydropower dams. Solar accounted for about 1%. But that mix is quickly changing, and by 2020, the San Francisco-based utility expects solar to account for 40% of its renewable portfolio.

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