The "Plant Safety Authorities Coordination Act of 2025" proposes to amend section 60101(a)(21) of title 49, United States Code, which defines the term "transporting gas." The primary goal of this legislation is to narrow the scope of federal oversight by excluding specific types of gas movement from this definition. Specifically, the bill clarifies that "transporting gas" does not include the movement of gas by a plant's owner or operator when that gas is used as fuel, feedstock, or for any other purpose directly supporting plant operations. This exclusion applies to gas moved through in-plant piping systems located entirely within the plant's grounds, or through transfer piping systems that extend less than one mile beyond the plant's boundaries. This amendment aims to streamline regulatory requirements for certain industrial gas movements.