; and (2) construction has not commenced on the date of enactment of this Act. (b) Authorization of extension Notwithstanding section 13 of the Federal Power Act ( 16 U.S.C. 806 ), on the request of a licensee of a covered project, the Federal Energy Regulatory Commission may, after reasonable notice and for good cause shown, extend in accordance with subsection (c) of this section the period during which the licensee is required to commence construction of the covered project for an additional 4 years beyond the 8 years authorized by such section 13. (c) Period of extension An extension of time to commence construction of a covered project under subsection (b) shall— (1) begin on the date on which the final extension of the period for commencement of construction granted to the licensee under section 13 of the Federal Power Act ( 16 U.S.C. 806 ) expires; and (2) end on the date that is 4 years after the latest date to which the Federal Energy Regulatory Commission is authorized to extend the period for commencement of construction under such section 13.