; (2) fully recover authorized fixed costs, including lost margins from lower annual sales due to energy efficiency programs; and (3) earn an incentive for shareholders if the energy efficiency standards are achieved. (j) State law Nothing in this section diminishes or qualifies any authority of a State or political subdivision of a State to adopt or enforce any law or regulation respecting electricity savings or natural gas savings, including any law or regulation establishing energy efficiency requirements that are more stringent than those under this section, except that no State law or regulation shall relieve any person of any requirement otherwise applicable under this section. . 6. Program review (a) National Academy of Sciences review The Secretary of Energy shall enter into a contract with the National Academy of Sciences under which the National Academy of Sciences shall, not later than July 1, 2025, and every 10 years thereafter, submit to Congress, the Federal Energy Regulatory Commission, and the Secretary of Energy a comprehensive evaluation of the implementation (including outcomes) of sections 610 and 611 of the Public Utility Regulatory Policies Act of 1978 (as added by this Act), including— (1) an evaluation of the effectiveness of implementation of such sections, including the specific design elements used in increasing the efficiency of retail natural gas and electricity distribution and consumption and increasing the deployment of renewable electricity capacity; (2) the opportunities for additional technologies and sources of efficiency and renewable electricity that have emerged since the date of enactment of this Act; (3) the impact of implementation of such sections on the reliability of electricity and natural gas supply; (4) the net benefits or costs of the implementation of such sections to the United States and the States, including— (A) the effects on electricity and natural gas demand and prices; (B) the economic development benefits of investment