; 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 established under subsection (d). (4) 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 1/2 of the States that have received approval under this subsection to administer the program, so that each State shall be reviewed not less frequently than once 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. (C) Deficiencies (i) In general In completing a review under this paragraph, if the Secretary finds deficiencies, the Secretary shall— (I) notify the State of the deficiencies; (II) direct the State to correct the deficiencies; and (III) require the State to report to the Secretary on progress made by not later than 180 days after the date on which the State receives notice under subclause (I). (ii) Substantial deficiencies If the deficiencies are substantial, the Secretary shall— (I) disallow the reported electricity savings or natural gas savings that the Secretary determines are not credible due to deficiencies