II 

118TH CONGRESS 

1ST SESSION S. 3055 

To require the Administrator of the Environmental Protection Agency to 

update the modeling used for lifecycle greenhouse gas assessments for 

approved fuel pathways under the Renewable Fuel Standard, and for 

other purposes. 

IN THE SENATE OF THE UNITED STATES 

OCTOBER 17, 2023 

Mr. THUNE (for himself, Ms. KLOBUCHAR, Mr. BROWN, Ms. DUCKWORTH, 

Mr. DURBIN, Ms. ERNST, Mrs. FISCHER, Mr. GRASSLEY, Mr. MARSHALL, Mr. RICKETTS, and Mr. ROUNDS) introduced the following bill; 

which was read twice and referred to the Committee on Environment and 

Public Works 

A BILL 

To require the Administrator of the Environmental Protection Agency to update the modeling used for lifecycle 

greenhouse gas assessments for approved fuel pathways 

under the Renewable Fuel Standard, and for other purposes. 

1 Be it enacted by the Senate and House of Representa2 tives of the United States of America in Congress assembled, 

3 SECTION 1. SHORT TITLE. 

4 This Act may be cited as the ‘‘Adopt the Greenhouse 

5 gases, Regulated Emissions, and Energy use in Transpor6 tation model Act’’ or the ‘‘Adopt GREET Act’’. 

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1 SEC. 2. DEFINITION OF ADMINISTRATOR. 

2 In this Act, the term ‘‘Administrator’’ means the Ad3 ministrator of the Environmental Protection Agency. 

4 SEC. 3. LIFECYCLE GREENHOUSE GAS EMISSIONS FOR AP5 PROVED FUEL PATHWAYS. 

6 (a) IN GENERAL.—Subject to subsection (b), not 

7 later than 90 days after the date of enactment of this Act, 

8 and not later than every 5 years thereafter, the Adminis9 trator shall update the methodology used by the Environ10 mental Protection Agency in lifecycle analyses with respect 

11 to greenhouse gas emissions that result from a fuel path12 way to which a D code has been assigned pursuant to a 

13 petition described in section 80.1416 of title 40, Code of 

14 Federal Regulations (or successor regulations), that has 

15 been approved by the Administrator. 

16 (b) REQUIREMENTS.— 

17 (1) FIRST UPDATE.—In carrying out the first 

18 update required under subsection (a), the Adminis19 trator shall adopt the most recent Greenhouse gases, 

20 Regulated Emissions, and Energy use in Transpor21 tation model (commonly referred to as the ‘‘GREET 

22 model’’) developed by Argonne National Laboratory. 

23 (2) SUBSEQUENT UPDATES.—In carrying out 

24 the second and each subsequent update required 

25 under subsection (a), the Administrator shall— 

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1 (A) as necessary, adopt, review, or update 

2 a methodology determined to be appropriate by 

3 the Administrator; or 

4 (B) adopt the methodology described in 

5 paragraph (1). 

6 (3) ESTABLISHMENT OF FUEL PATHWAYS.— 

7 For any fuel pathway to which the Administrator as8 signs a D code pursuant to a petition described in 

9 section 80.1416 of title 40, Code of Federal Regula10 tions (or successor regulations), that is approved by 

11 the Administrator after the date of enactment of 

12 this Act, the Administrator shall, not later than 90 

13 days after the date on which the Administrator as14 signs that code, adopt the methodology described in 

15 paragraph (1) for purposes of modeling lifecycle 

16 analyses with respect to greenhouse gas emissions 

17 that result from that fuel pathway. 

18 (c) REPORT.—If the Administrator fails to carry out 

19 subsection (b)(2) before the applicable deadline described 

20 in subsection (a), the Administrator shall submit to the 

21 Committees on Agriculture, Nutrition, and Forestry, En22 ergy and Natural Resources, and Environment and Public 

23 Works of the Senate and the Committees on Agriculture, 

24 Energy and Commerce, and Science, Space, and Tech25 nology of the House of Representatives a report describing 

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1 the reasons for the failure to carry out subsection (b)(2), 

2 which may include a determination by the Administrator 

3 that the methodology adopted or updated in a previous 

4 update under subsection (a) remains the most current 

5 methodology based on available data, research, and tech6 nology. 

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