The Commonwealth Court was required to determine whether or not Sunoco had authority to condemn property in order to advance phase two of its Mariner East pipeline project. Several property owners challenged the condemnations, arguing that Sunoco was not regulated by the Pennsylvania Utility Commission (PUC) and, therefore, could not exercise the eminent domain powers of the Commonwealth. The Commonwealth Court agreed with Sunoco, holding that the company was regulated by PUC for purposes of those portions of the project occurring solely in Pennsylvania.