in a manner that prevents emission to the atmosphere. . 402. Federal clean electricity standard Title VI of the Public Utility Regulatory Policies Act of 1978 ( 16 U.S.C. 2601 et seq.) is further amended by adding after section 610 (as added by this Act) the following: 611. Federal clean electricity standard (a) Clean electricity requirement (1) Definition of retail electricity supplier In this section, as determined for each calendar year, the term retail electricity supplier means an entity in the United States that sold not fewer than 20 megawatt-hours of electric energy to electric consumers for purposes other than resale during the preceding calendar year. (2) In general Effective beginning in the first compliance period of the program, and for each compliance period thereafter, each retail electricity supplier shall surrender clean electricity credits corresponding to the required percentage, as determined under paragraph (3), of the electric energy it sells to electric consumers. (3) Determination of required percentage The Secretary shall determine, and may adjust as needed, the required percentage for each compliance period, such that the power sector achieves, by 2050, a reduction in carbon dioxide emissions of 80 percent from emission levels in the year of enactment of this section, and that carbon dioxide emission levels are reduced linearly in each compliance period through 2050, provided that— (A) in 2026, the Secretary shall make a projection of the electricity generated in 2030 that could qualify for clean electricity credits under subsection (d)