KPCC –

Starting in 2020, if you want to build a new house or small apartment building in California, it must have solar panels on the roof.

The California Energy Commission is expected to vote Wednesday to require solar panels in the state’s building code. A yes vote would make California the first state in the country with such a rule.

The solar panel requirement is the culmination of many years of slowly requiring new houses in California to be more and more energy efficient.

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