A week after an energy expert told hearings into the gas plant cancellations that the decision for both Mississauga and Oakville could cost close to a billion dollars, the Liberal government admits $40 million figure to cancel Oakville could be wrong.

Energy minister Bob Chiarelli says it's all in the Ontario Power Authorty's (OPA) hands, underlining the OPA negotiated the cancellation and did all the calculations.

Chiarelli says the OPA gave the province the $40 million figure.

The energy minister, however, won't give a specific figure relating to the Mississauga and Oakville cancellations. He says he wants to wait for an auditor general report into the issue.

Chiarelli underlines the Liberals weren't the only party which wanted to cancel the gas plants, point to promises made by the NDP and Tories.