In electric power, decommissioning: the permanent retirement of a generating plant or unit from operation upon reaching its maximum economic life and the generation of electricity is no longer technically viable, subject to the confirmation of the DOE under this Circular [Section 3.2, DOE Department Circular No. DC2023-07-0022, Implementing Guidelines on the Decommissioning and Mothballing of a Generating Plant or Unit Pursuant to Section 2.8 of DOE Department Circular (DC) No. DC2010-03-003]
In energy resources, hydrogen: the permanent retirement of a Hydrogen Energy facility or unit from operation upon reaching its maximum economic life or discontinued operation in the facility [Section 4(b), DOE Department Circular No. DC2024-01-0001, Providing a National Policy and General Framework, Roadmap, and Guidelines for the Hydrogen in the Energy Sector]
In nuclear energy: the administrative and technical actions taken to remove some or all of the regulatory controls from a facility [Section 5(g), Philippine National Nuclear Energy Safety Act of 2025]