; and (ii) (I) the average amounts of carbon dioxide and methane emissions, in terms of carbon dioxide equivalent, that occur during extraction, flaring, processing, and transportation in the United States of the fossil fuel consumed by the generator; or (II) with respect to a generator that the Secretary determines under subparagraph (B) has demonstrated that the fossil fuel consumed by such generator is associated with the release of smaller amounts of carbon dioxide and methane emissions than the amounts described in subclause (I), such smaller amounts. (B) Determination (i) In general The Secretary may determine that a generator has demonstrated that the fossil fuel consumed by such generator is associated with the release of smaller amounts of carbon dioxide and methane emissions than the amounts described in subparagraph (A)(ii)(I) if the generator— (I) accounts for low-frequency, high-emission events