services from the Falcon and Amistad Dams shall be credited to this account as discretionary offsetting collections, to remain available until expended for the sole purpose of funding the annual expenses of the hydroelectric facilities of these Dams and associated Western Area Power Administration activities: Provided further , That the sum herein appropriated for annual expenses shall be reduced as collections are received during the fiscal year so as to result in a final fiscal year 2021 appropriation estimated at not more than $228,000: Provided further , That for purposes of this appropriation, annual expenses means expenditures that are generally recovered in the same year that they are incurred: Provided further , That for fiscal year 2021, the Administrator of the Western Area Power Administration may accept up to $1,526,000 in funds contributed by United States power customers of the Falcon and Amistad Dams for deposit into the Falcon and Amistad Operating and Maintenance Fund, and such funds shall be available for the purpose for which contributed in like manner as if said sums had been specifically appropriated for such purpose: Provided further , That any such funds shall be available without further appropriation and without fiscal year limitation for use by the Commissioner of the United States Section of the International Boundary and Water Commission for the sole purpose of operating, maintaining, repairing, rehabilitating, replacing, or upgrading the hydroelectric facilities at these Dams in accordance with agreements reached between the Administrator, Commissioner, and the power customers. Federal energy regulatory commission Salaries and expenses For expenses necessary for the Federal Energy Regulatory Commission to carry out the provisions of the Department of Energy Organization Act ( 42 U.S.C. 7101 et seq.), including services as authorized by 5 U.S.C. 3109 , official reception and representation expenses not to exceed $3,000, and the hire of passenger motor vehicles, $404,350,000, to remain