California. Birthplace of the Frisbee, skateboard, television, canned tuna and (yup) fortune cookies has added another first to the list: California has become the first state in the nation to mandate the use of solar panels for new residential construction.
On May 9, 2018, the California Energy Commission (CEC) unanimously approved the state’s 2019 Building Energy Efficiency Standards. The 2019 Energy Efficiency Standards update the California Building Standards Codes found at Title 24 of the California Code of Regulations which are updated every three years. The 2019 Energy Efficiency Standards go into effect on January 1, 2020.