TORONTO – The New Democrats say the discovery of more documents on cancelled gas plants in Oakville and Mississauga shows Premier Kathleen Wynne has not been truthful, and are demanding a public inquiry.

Ontario’s opposition parties are in shock after the Liberals admitted Thursday they found a third batch of documents on the gas plants, after insisting Wednesday that all the relevant data was made public months ago.

NDP Leader Andrea Horwath says she’s convinced Wynne and senior Liberals were briefed after the Ontario Power Authority told the government last November there “likely” were more documents.

Horwath calls it “one steaming mess,” and says it’s obvious the new premier was not being truthful when she told the legislature all documents had been released.

The OPA says it “messed up some search terms” in its first two looks for files using Liberal government code names for the gas plants such as Project Vapour, Project Banana and Project Fruit Salad.

The Progressive Conservatives and NDP insisted for months that the Liberals had not released all the gas plant documents, and say there are still no files from the premier’s office or the minister of energy.

The opposition parties say they also believe the cancellation of the gas plants cost taxpayers a lot more than the $230 million the Liberals claim.