Fossil fuel energy The term fossil fuel energy means electric energy generated, in whole or in part, by a fossil fuel resource. (4) Fossil fuel energy credit The term fossil fuel energy credit means a credit issued under subsection (f) that represents 1 megawatt hour of fossil fuel energy. (5) Fossil fuel resource The term fossil fuel resource means coal, oil, gas, oil shale, or tar sands. (6) Retail electric supplier (A) In general The term retail electric supplier means an entity that sold not less than 1,000 megawatt hours of electric energy to electric consumers for purposes other than resale during the preceding calendar year. (B) Inclusion The term retail electric supplier includes an entity that generates not less than 1,000 megawatt hours of electric energy for use by the entity. (7) Retire The term retire , with respect to a fossil fuel energy credit, means to disqualify the fossil fuel energy credit for any subsequent use under this section, including sale, transfer, exchange, or submission in satisfaction of a compliance obligation. (b) Compliance For calendar year 2022 and each calendar year thereafter, each retail electric supplier shall meet the requirements of subsections (c) and (d) by submitting to the Administrator, not later than April 1 of the following calendar year, as applicable— (1) for a retail electric supplier that exceeds the maximum allowable percentage of fossil fuel energy generation for the applicable calendar year, as determined under subsection (c), a quantity of fossil fuel energy credits sufficient to offset that excess, as determined and certified by the Administrator