; or (ii) $5 per million Btu of natural gas savings needed to make up any deficit with regard to a compliance obligation under the applicable performance standard. (B) Use of payments Alternative compliance payments collected by a State under subparagraph (A) shall be used by the State to administer the delegated authority of the State under this section and to implement cost-effective energy efficiency programs that— (i) to the maximum extent practicable, achieve electricity savings and natural gas savings in the State sufficient to make up the deficit associated with the alternative compliance payments; and (ii) can be measured and verified in accordance with the applicable procedures and standards under subsection (f) or paragraph (3), as applicable. (5) Review of State implementation (A) Periodic review Every 2 years, the Secretary shall review State implementation of this section for conformance with the requirements of this section in approximately ½ of the States that have received approval under this subsection to administer the program, so that each State shall be reviewed at least every 4 years. (B) Report To facilitate the review under subparagraph (A), the Secretary may require the State to submit a report demonstrating the conformance of the State with the requirements of this section, including— (i) reports submitted by retail electricity suppliers and retail natural gas suppliers to the State demonstrating compliance with applicable performance standards; (ii) the impact of the standards on projected electricity and natural gas demand within the State; (iii) an accounting of the use of alternative compliance payments by the State and the resulting electricity savings and natural gas savings achieved