Opposition parties accused Wynne of having a role in the McGuinty government's costly decision to cancel the construction of gas plants in Mississauga and North-East Oakville in 2011, when she was co-chair of the Liberal campaign. Wynne denied that she was involved in the gas plant meetings or in the decision to cancel the plants, and asked the auditor general to investigate the cost of cancelling the plants. After months of investigation, the auditor general released their report on the gas plants in October 2013, suggesting the cancellation of both gas plants could cost taxpayers as much as $1.1 billion. After the report was released by the auditor general, Wynne admitted the gas plant relocations "shouldn't have happened". She apologized, vowing to ensure that "this doesn't happen again". In February 2013, the legislative committee that had been investigating the gas plants cancellation prior to McGuinty's resignation and prorogation of the legislature in October resumed its work. Wynne called for the release of all documents related to the decision to the legislature's Justice Committee, and agreed to testify before the committee, while continuing to deny that she was involved in the decision to cancel the plants. Appearing before the committee in April 2013, Wynne testified she had had no role in the decision to cancel the plants, and had learned of the decision to cancel the plants through media reports. In June 2013, opposition parties called on the Ontario Provincial Police (OPP) to open an investigation into new allegations that staffers in Premier McGuinty's office had deleted emails regarding the gas plants. On June 7, the OPP launched a criminal investigation into the deletion of the emails, after the Privacy Commissioner ruled that the gas plant emails were illegally deleted. In April 2014, OPP investigators stated that there was no evidence that the premier had been involved in the deletion of emails related to the gas plants, and that the Premier was not the subject of their investigation, which was instead focused on staffers and bureaucrats who had worked in Premier McGuinty's office. On March 24, 2014, Wynne introduced a piece of legislation called the Public Sector and MPP Accountability and Transparency Act, which implemented a wide range of new measures designed to increase government accountability and transparency. Among other things, the act required all MPPs, cabinet ministers, parliamentary assistants, opposition leaders, and their respective staff to post their expense reports