; (B) direct sales; or (C) other transactional arrangements that sell electric energy or generating capacity either separately or combined with the transfer of zero-emission electricity credits, including transactions that pair zero-emission electricity credits with the demand of the retail electricity supplier. (b) Administration In carrying out the program under this section, the Secretary shall ensure that a zero-emission electricity credit may be— (1) submitted only once under section 202(a); and (2) only purchased by, transferred to, or otherwise secured by a retail electricity supplier. (c) Delegation of market function (1) In general In carrying out the program under this section, the Secretary may delegate, to one or more appropriate entities— (A) the administration of a transparent national market for the sale or trade of zero-emission electricity credits; and (B) the tracking of dispatch of zero-emission electricity generation. (2) Administration In making a delegation under paragraph (1), the Secretary shall ensure that the tracking and reporting of information concerning the dispatch of zero-emission electricity generation is transparent, verifiable, and independent of any interests subject to an obligation under this title. (d) Banking of zero-Emission electricity credits A zero-emission electricity credit may be used for compliance with the requirements of section 202 for— (1) the calendar year for which the zero-emission electricity credit is issued (in this subsection referred to as the applicable calendar year ); and (2) (A) any of the 5 calendar years following the applicable calendar year, if the Secretary determines under section 202(a)(4) that the average annual price of a zero-emission electricity credit is equal to or less than one half of the alternative compliance payment for each of the 3 calendar years prior to the applicable calendar year