Fossil fuels are still a large source of electricity, but California has made progress with renewables while keeping the lights on. The state recently hit a milestone: 100 days this year with 100% carbon-free, renewable electricity for at least a part of each day. The state notched the milestone while avoiding blackouts and emergency power reductions this year, even with the hottest July on record. That's according to Stanford University engineering Professor Mark Z. Jacobson. Energy experts say the progress is largely due to the substantial public and private investments in renewable energy. But California still has a long way to go to stop burning fossil fuels. Natural gas remains its single largest source of electricity.

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Four temporary power plants proposed to alleviate expected summer rolling blackouts, have been turned down by the California Energy Commission…