; and (2) in consultation with the Secretary, issue guidelines for the Federal Housing Administration to determine the estimated energy savings under subsection (c) for properties with an energy efficiency report. (b) Requirements The enhanced energy efficiency underwriting valuation guidelines required under subsection (a) shall include— (1) a requirement that if an energy efficiency report that meets the requirements of section 1502(c)(2) is voluntarily provided to the mortgagee, such report shall be used by the mortgagee or the Federal Housing Administration to determine the estimated energy savings of the subject property