The "Securing Energy Supply Chains Act" directs the Secretary of Energy to establish an Energy Non-Procurement List within 90 days of enactment. This list will identify entities determined to be engaged in activities detrimental to the national security, economic security, or foreign policy of the United States. The Secretary must prioritize entities involved in critical materials and batteries, and mandatorily include foreign entities of concern and those on the Department of Defense's Chinese Military Company List. The Secretary is required to revise this list annually and submit a report to Congress, including an unclassified version of the list and a classified annex detailing justifications for inclusions or removals. Beginning one year after enactment, the bill generally prohibits the Secretary from entering into or renewing contracts with covered contractors , defined as those contracting with listed entities or using their components. An exception allows for contracts if the necessary goods, services, or technologies are not otherwise procurable, subject to specific conditions and monthly contractor reporting. Additionally, the bill mandates a study, to be completed within one year, by the Secretary of Energy in coordination with other federal agencies. This study will identify and analyze existing federal lists of problematic entities, such as foreign entities of concern or those subject to sanctions. The goal is to identify overlaps and recommend ways to harmonize these lists, providing clarity on which entities the Federal Government should not contract with for goods, services, or technology.