; (H) assess the most cost-effective voluntary investments in biogas to reduce waste and methane emissions; and (I) identify and advance additional priorities, as determined by the Task Force. (4) Report Not later than 18 months after the date of the establishment of the Task Force, the Task Force shall submit to Congress a report that— (A) describes the steps taken by the Task Force to carry out the duties of the Task Force under paragraph (3); and (B) identifies and prioritizes policies and technology opportunities— (i) to expand the biogas industry; (ii) to eliminate barriers to investment in biogas systems in the landfill, livestock, wastewater, and other relevant sectors; and (iii) to enhance opportunities for private and public sector partnerships to finance biogas systems. (c) Advancement of biogas research (1) Study on biogas (A) In general The Secretary, in coordination with the Secretary of Energy and the Administrator, shall enter into an agreement with the National Renewable Energy Laboratory to conduct a study relating to biogas. (B) Study Under the agreement described in subparagraph (A), the study conducted by the National Renewable Energy Laboratory shall include an analysis of— (i) barriers to injecting biogas into existing natural gas pipelines; (ii) methods for optimizing biogas systems, including methods to obtain the highest energy output from biogas, including through the use of co-digestion; (iii) opportunities for, and barriers to, the productive use of biogas system co-products, carbon dioxide from biogas processing, and recovered nutrients; (iv) the optimal configuration of local, State, or regional infrastructure for the production of electricity, heat, or fuel from biogas, including infrastructure for the aggregation, cleaning, and pipeline injection of biogas