; and (B) each retail natural gas supplier shall submit to the Secretary a report, in accordance with regulations promulgated by the Secretary, demonstrating that it has achieved cumulative natural gas savings (adjusted to account for any attrition of savings measures implemented in prior years) in each calendar year that are equal to the applicable percentage, established under paragraph (2), (3), or (4), of the base quantity of such retail natural gas supplier. (2) Standards for 2019 through 2032 For each of calendar years 2019 through 2032, the applicable percentages are as follows: Calendar Year Cumulative Electricity Savings Percentage Cumulative Natural Gas Savings Percentage 2019 1.00 0.50 2020 2.00 1.25 2021 3.00 2.00 2022 4.25 3.00 2023 5.50 4.00 2024 7.00 5.00 2025 8.50 6.00 2026 10.00 7.00 2027 11.50 8.00 2028 13.00 9.00 2029 14.75 10.00 2030 16.50 11.00 2031 18.25 12.00 2032 20.00 13.00 (3) Subsequent years (A) Calendar years 2033 through 2042 Not later than December 31, 2030, the Secretary shall promulgate regulations establishing performance standards (expressed as applicable percentages of base quantity for both cumulative electricity savings and cumulative natural gas savings) for each of calendar years 2033 through 2042. (B) Subsequent extensions Except as provided in subparagraph (A), not later than December 31 of the penultimate reporting period for which performance standards have been established under this paragraph, the Secretary shall promulgate regulations establishing performance standards (expressed as applicable percentages of base quantity for both cumulative electricity savings and cumulative natural gas savings) for the 10-calendar-year period following the last calendar year for which performance standards previously were established. (C) Requirements The Secretary shall establish standards under this paragraph at levels reflecting the maximum achievable level of cost-effective energy efficiency potential, taking into account— (i) cost-effective energy savings achieved by leading