California Energy Commission recently mandates that new homes built in the state starting in 2020 must have rooftop solar panels, causing stocks in rooftop solar developers Vivint Solar and Sunrun to increase.

This new mandate is expected to increase housing prices. "The cost for residential solar includes relatively high marketing expenses," says Dirk Michels, a partner in Ballard Spahr's Energy and Project Finance Group. "If solar systems would be sold integrated into new homes, that would reduce marketing cost significantly, which could result in substantially lower cost for residential solar going forward."

That being said, Michels sees the financing model for residential solar shifting from third-party financing to consumer loan-style deals.

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