In electric power, power lines obstruction: entities that own, operate, or control one or more distribution systems in the main grid, and off-grid other than DUs such as, but not limited to, Qualified Third Parties and those under management contracts for conveyance of electricity [Section 4(m), Anti-Obstruction of Power Lines Act of 2019; Section 4(ff), DOE Department Circular No. DC2020-02-0002, The Implementing Rules and Regulations of Republic Act No. 11361, Otherwise Known as the “Anti-Obstruction of Power Lines Act”]