U.S. Sens. John Thune (R-S.D.) and Amy Klobuchar (D-Minn.), members of the Senate Committee on Agriculture, Nutrition, and Forestry, recently requested the Environmental Protection Agency (EPA) to update its greenhouse gas modeling for biofuels and adopt the Argonne National Lab’s Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation (GREET) model. These long-overdue updates would permit consistent comparison between petroleum-based fuels, natural gas systems, electric generation, and renewable fuels.
“We ask that EPA utilize the GREET Model as the baseline GHG determination for biofuels so that stakeholders may have the opportunity to readily compare the GHG intensity of competing energy sources and policymakers may have a fuller picture of how to decarbonize the energy and transportation sectors,” the senators wrote. “The GREET Model has been among the most widely utilized sources of GHG data, underpinning research that finds corn ethanol can currently achieve 46 percent lower lifecycle carbon intensity than gasoline. This environmental benefit will only increase as biorefining and fuel technologies improve, the agriculture sector advances operational efficiencies and produces higher yields of renewable feedstock per acre, and as biofuel operations are paired with carbon capture projects.”
The letter was also signed by U.S. Sens. Sherrod Brown (D-Ohio), Dick Durbin (D-Ill.), Tammy Duckworth (D-Ill.), Joni Ernst (R-Iowa), Chuck Grassley (R-Iowa), Roger Marshall (R-Kan.), and Mike Rounds (R-S.D.).
Thune and Klobuchar introduced the Adopt GREET Act, legislation that would require the EPA to update its greenhouse gas modeling for ethanol and biodiesel. Their bill would hold EPA accountable by requiring it to update its modeling every five years or report to Congress to affirm its modeling is current or otherwise explain why no updates were made.
Full letter below:
The Honorable Michael S. Regan
Administrator
Environmental Protection Agency
1200 Pennsylvania Avenue, N.W.
Washington, D.C. 20460
Dear Administrator Regan:
We write in response to the decision by the Environmental Protection Agency (EPA) to review the scientific methodology and modeling used in the transportation sector pursuant to the Renewable Fuel Standard (RFS) to accurately ascertain the greenhouse gas (GHG) emissions of land-based biofuels. In support of this effort and the need for stakeholders to have a consistent and well-vetted standard through which all biofuels may be compared, we urge you to adopt Argonne National Lab’s Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation (GREET) Model. Adopting the GREET Model will not only permit the federal government to further standardize its comparison of GHG emissions for biofuels like ethanol, biodiesel, and sustainable aviation fuel, but enable over 50,000 registered GREET users to more readily compare renewable fuels to other sources of energy.
As presented during the March 1, 2022, EPA workshop, the GREET Model has provided annually updated lifecycle “well-to-wheels” analysis for an expanding universe of energy sources since 1995. Importantly, the GREET Model permits consistent comparison between petroleum-based fuels, natural gas systems, electric generation, and renewable fuels derived from a variety of technology pathways, accounting for the lifecycle carbon intensity of key farming inputs. We ask that EPA utilize the GREET Model as the baseline GHG determination for biofuels so that stakeholders may have the opportunity to readily compare the GHG intensity of competing energy sources and policymakers may have a fuller picture of how to decarbonize the energy and transportation sectors.
The GREET Model has been among the most widely utilized sources of GHG data, underpinning research that finds corn ethanol can currently achieve 46 percent lower lifecycle carbon intensity than gasoline. This environmental benefit will only increase as biorefining and fuel technologies improve, the agriculture sector advances operational efficiencies and produces higher yields of renewable feedstock per acre, and as biofuel operations are paired with carbon capture projects. Updated and consistent GHG modeling can provide a positive feedback loop that drives continued progress to lower carbon intensity at both the farm and fuel level. From “field-to-tailpipe,” the reduction of carbon intensity provided by biofuels deepens as consumers select higher blends of biofuels like E15, E30, E85, and B20 for their energy needs.
We applaud EPA for reviewing and updating its GHG modeling resources in accordance with its obligations under the RFS to ensure that accurate and reliable data can remain central to policies concerning energy consumption and reducing emissions. We hope that EPA will use the GREET Model as its primary resource for determining lifecycle GHG emissions of biofuels, which could immediately contribute to ongoing efforts to reduce energy emissions.
Thank you for the timely consideration of our request and your assistance to enable homegrown biofuels to serve as a solution to our nation’s growing energy challenges.
Sincerely,