Hearings into the cancelled Mississauga and Oakville gas plants will resume at Queen's Park on Thursday.

The province's justice committee will look into the release of over 56,000 pages of documents surrounding the 2010 and 2011 decisions. Opposition parties maintain they still believe more files need to be released, including emails from former Premier Dalton McGuinty's office.

While Premier Kathleen Wynne underlined she was part of the McGuinty government which made the call in Oakville and Mississauga, she regrets they didn't make a better decision on the locations from the start.

Wynne repeated she wants the Liberal government to be transparent about the cancellation process and wants to provide all the information needed.

The premier has said she would testify at the hearings if asked.

Wynne was Liberal campaign co-chair during the 2011 provincial election, when the promise to shut down construction of the Mississauga plant was made. She maintains she had nothing to do with the decision.

Opposition continue to pursue a contempt motion against former energy minister Chris Bentley regarding the release of documents. Bentley has stepped down as MPP.

The gas plant cancellations cost taxpayers $230 million.