The state of California is due to vote next week on new energy standards that would require all new homes to be constructed with solar panels from 2020 onward. If the new standards are approved, California would become the first U.S. state to make solar panels mandatory. The move would greatly increase California’s solar output and is expected to make energy more affordable for residents of homes built after 2020. The new energy standards also call for increased reliance on electricity over natural gas and increased battery storage.