Instructs the Federal Energy Regulatory Commission (FERC), upon licensee request, to: (1) extend the period for commencing construction of project works for FERC project number 4656 (Arrowrock Hydroelectric Project, Idaho) for a period of three years, if the project license is in effect on the date of the enactment of this Act; or (2) reinstate the license, if it has been terminated already, and extend for an additional three years the period for commencing such construction.