Thune, Brown Introduce Bipartisan Bill to Increase Biogas Production, Promote Investment in Rural Amerca 07/22/2021 | 05:58pm EDT Send by mail : Message : WASHINGTON - U.S. Sens. John Thune (R-S.D.) and Sherrod Brown (D-Ohio) introduced bipartisan legislation to encourage investment in biodigester and nutrient recovery systems, while establishing a market for farmers who already have a surplus of waste materials that can be used for biogas production. Thune and Brown's bill, the Agricultural Environmental Stewardship Act, will help expand the market for renewable biogas by providing a 30 percent investment tax credit to help offset the upfront costs associated with building biodigester systems. U.S. Reps. Ron Kind (D-Wis.) and Tom Reed (R-N.Y.) introduced companion legislation in the House of Representatives.