; or (2) returned to the Secretary. (h) Regulations Not later than 90 days after the date of enactment of this Act, the Secretary shall promulgate such regulations as the Secretary determines to be necessary to carry out this section, to take effect on the date of promulgation. (i) Funding There is authorized to be appropriated to the Secretary to carry out this section $200,000,000 for each of fiscal years 2018 through 2022, to remain available until expended. 2 Safe, affordable, and environmentally sound natural gas distribution 33201. Improving the natural gas distribution system (a) Establishment of program The Secretary of Energy shall establish a program to award grants to States, in accordance with this section, for the purpose of providing incentives for natural gas distribution companies to improve the public safety and environmental performance of the natural gas distribution system. (b) Grants to States (1) In general A State may apply for a grant under this section to provide funds to natural gas distribution companies in the State that are carrying out an eligible project. (2) Requirements In applying for a grant under this section, a State shall demonstrate how the State rate-setting program will ensure that funds provided to natural gas distribution companies under this section are used in accordance with the requirements of this section. (c) Eligible projects A project that is eligible to be funded through a grant to a State under this section is a project carried out by a natural gas distribution company to accelerate, expand, or enhance the implementation of a plan approved by the State before the date of enactment of this section for— (1) replacement of cast and wrought iron and bare steel pipes and other leak-prone components of the natural gas distribution system