This legislation mandates the Secretary of Transportation to conduct a comprehensive study within 18 months on the use of composite material pipelines for the safe transportation of hydrogen and hydrogen blended with natural gas. The study will assess both potential and existing applications, considering commercially available materials, relevant test data, and recommended standards or Federal agency authorizations. To ensure transparency and gather diverse perspectives, the Secretary must facilitate public participation throughout the study process, including a pre-completion public meeting and a 60-day public comment period on a draft study. Following the study's completion and a post-completion public meeting to present findings, the Secretary is required to initiate a rulemaking process within 18 months to permit the use of composite materials for these specific pipeline transportation purposes.