; verification The regulations promulgated under this section shall include provisions governing the issuance, tracking, and verification of Federal renewable electricity credits. (B) Credit ratio Except as provided in paragraphs (2) through (4), the Commission shall issue to each generator of renewable electricity, 1 Federal renewable electricity credit for each megawatt hour of renewable electricity generated by the generator after December 31, 2018. (C) Serial number The Commission shall assign a unique serial number to each Federal renewable electricity credit. (2) Generation from certain State renewable electricity programs (A) In general If renewable electricity is generated with the support of payments from a retail electric supplier pursuant to a State renewable electricity program (whether through State alternative compliance payments or through payments to a State renewable electricity procurement fund or entity), the Commission shall issue Federal renewable electricity credits to the retail electric supplier for the portion of the relevant renewable electricity generation that is attributable to payments made by the retail electric supplier, as determined pursuant to regulations promulgated by the Commission. (B) Remaining portion For any remaining portion of the relevant renewable electricity generation, the Commission shall issue Federal renewable electricity credits to the generator, as provided in paragraph (1), except that not more than 1 Federal renewable electricity credit shall be issued for the same megawatt hour of electricity. (C) State guidance In determining how Federal renewable electricity credits will be apportioned among retail electric suppliers and generators under this paragraph, the Commission shall consider information and guidance issued by the applicable one or more States. (3) Certain power sales contracts Except as otherwise provided in paragraph (2), if a generator has sold renewable electricity to a retail electric supplier under a contract for power from a facility placed