Adds a new subsection (l) establishing a renewable natural gas fuel credit ($1.00 per gallon or gasoline gallon equivalent) with definitions, treatment of blended renewable natural gas, certification requirements, a gasoline gallon equivalent definition, and a termination date; and updates cross-references in subsections (a), (h), (i), and (j) to account for the new subsection (l).

Redesignates certain paragraphs in 6427(e), adds a new paragraph providing for payment (without interest) of the renewable natural gas fuel credit to persons who sell or use renewable natural gas in their trade or business, extends the termination provisions to cover renewable natural gas sold or used after December 31, 2035, and makes conforming amendments to cross-references and terminology to include renewable natural gas and the new paragraph numbering.