Transitioning the U.S. economy from fossil fuels to 100% clean energy is a massive undertaking. But from an equity, economic, and environmental perspective, the opportunities far outweigh the costs. Late last year, California instituted a revolutionary piece of policy. Starting in 2020, all new homes will be required to be built with rooftop solar panels and onsite battery storage. On top of that, developers would need to comply with a whole new host of codes to ensure the buildings will be as energy-efficient as possible.