; and (B) not more than 50 percent to provide assistance for eligible installation projects with respect to which low-income households make up at least 25 percent of the subscribers to the project. (3) Regulations Not later than 120 days after the date of enactment of this Act, the Secretary shall publish in the Federal Register regulations to carry out this section, which shall take effect on the date of publication. (h) Authorization of appropriations (1) In general There is authorized to be appropriated to the Secretary to carry out this section $200,000,000 for each of fiscal years 2021 through 2025, to remain available until expended. (2) Amounts for planning projects Of the amounts appropriated pursuant to this section over the period of fiscal years 2021 through 2025, the Secretary shall use not more than 15 percent of funds to provide assistance to eligible planning projects. (i) Relationship to other assistance The Secretary shall, to the extent practicable, encourage eligible entities that receive assistance under this section to leverage such funds by seeking additional funding through federally or locally subsidized weatherization and energy efficiency programs.