‘Sec. 3. 10 MRSA §9722, sub-§6, ¶O is enacted to read:
O. No later than July 1, 2020, adopt, amend and maintain an appendix to the Maine Uniform Building and Energy Code as an optional part of the code that contains energy conservation and efficiency requirements that are based on established national voluntary efficiency standards that exceed the energy code requirements established in the Maine Uniform Building and Energy Code. As the code is updated, the board shall ensure that the energy conservation and efficiency requirements in the appendix continue to exceed the requirements established in the Maine Uniform Building and Energy Code. The appendix must be made available for voluntary adoption by any municipality. The board shall maintain a list of municipalities that have voluntarily adopted the appendix to the Maine Uniform Building and Energy Code on its publicly accessible website.’