; and (bb) the regulations promulgated pursuant to that subclause shall minimize the escape or further emission of qualified carbon oxide into the atmosphere. (III) Existing requirements In promulgating regulations pursuant to this clause, the Secretary shall incorporate any existing Federal requirements for the permanent geologic storage of carbon oxides, including any requirements under section 45Q of the Internal Revenue Code of 1986. (ii) Adjusted quantity (I) In general Notwithstanding subparagraphs (B) and (C), except as provided in subclause (II), the quantity of Federal clean energy credits issued under this paragraph to a generator at which qualified carbon oxide is captured and used as a tertiary injectant in a qualified enhanced oil or natural gas recovery project shall be reduced by 50 percent. (II) No reduction If the qualified carbon oxide captured and used as a tertiary injectant in a qualified enhanced oil or natural gas recovery project by a generator achieves compliance with the conditions established pursuant to clause (i)(I)(aa), the quantity of Federal clean energy credits issued to the generator shall not be reduced. (7) Qualified energy storage systems The quantity of Federal clean energy credits issued to each qualified energy storage system shall be equal to the product obtained by multiplying— (A) the electric energy dispatched and sold by the qualified energy storage system (expressed in megawatt-hours); and (B) the difference between— (i) 1.0; and (ii) the quotient obtained by dividing— (I) the average carbon intensity of the clean energy stored in the qualified energy storage system, as determined in accordance with subsection (g) (expressed in metric tons per megawatt-hour)