California might become the first state in the U.S. to require new homes to be built with solar panels, which could hike prices for consumers.

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The California Energy Commission is expected to vote on the proposal Wednesday. If approved, it would go into effect in 2020 and apply to any homes or buildings up to three stories. Homes in the shade or otherwise unable to be fitted for installation may be exempted.

The requirement would not require homeowners’ solar energy to offset energy consumed completely.

Over the near term, requiring solar installations could increase construction costs per home in the state by as much as $30,000. Over the course of about 25 years – or the average solar panel lifespan – the green-energy products could save owners anywhere from $50,000 to $60,000.

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