Question: For which political party does Mark Christopher Butler represent an electoral division in the state of South Australia, which includes Torrens Island and Garden Island?
Sentence (from "Barker Inlet Power Station"): It was announced on 7 June 2017 by AGL Energy to replace part of its aging Torrens Island Power Station and would be built alongside the existing station on Torrens Island in the northwestern suburbs of Adelaide.
Relevant evidence: No