; and (2) a summary of the activities carried out under the efficiency grant program. (d) Authorization of appropriations (1) In general There is authorized to be appropriated to carry out this section $5,000,000 for each of fiscal years 2021 through 2024, to remain available until expended. (2) Limitation on use of funds Of the amounts made available for grants under paragraph (1), not more than 2 percent may be used to pay the administrative costs of the Administrator. . 2005. Wastewater efficiency grant pilot program (a) Definitions In this section: (1) Administrator The term Administrator means the Administrator of the Environmental Protection Agency. (2) Pilot program The term pilot program means the wastewater efficiency grant pilot program established under subsection (b). (3) Treatment works The term treatment works has the meaning given the term in section 212 of the Federal Water Pollution Control Act ( 33 U.S.C. 1292 ). (b) Establishment Subject to the availability of appropriations, the Administrator shall establish a wastewater efficiency grant pilot program to award grants to owners or operators of publicly owned treatment works to carry out projects that create or improve waste-to-energy systems. (c) Selection (1) Applications To be eligible to receive a grant under the pilot program, an owner or operator of a treatment works shall submit to the Administrator an application at such time, in such manner, and containing such information as the Administrator may require. (2) Number of recipients The Administrator shall select not more than 15 recipients of grants under the pilot program from applications submitted under paragraph (1). (d) Use of funds (1) In general Subject to paragraph (2), a recipient of a grant under the pilot program may use grant funds for— (A) sludge collection; (B) installation of anaerobic digesters; (C) methane capture; (D) methane transfer; (E) facility upgrades and retrofits necessary to create or improve waste-to-energy systems