TORONTO - The governing Liberals are at a loss to explain why construction continues at a gas plant in Mississauga they promised to shut down during the election campaign.

Critics question whether the Liberals plan of keep their promise when they won't say how they'd move a facility that's getting closer to completion.

Premier Dalton McGuinty laughed off those questions yesterday, saying his plans to cancel the project are "more complicated" than he thought.

But he insists his government, which is expected to sink $16 billion into the red this year alone, will relocate the plant.

Energy Minister Chris Bentley says the Ontario Power Authority is currently in discussions about relocating the plant, but wouldn't say how much it will cost.

Both the Progressive Conservatives and NDP say they're worried about how much taxpayers will have to pay for cancelling the gas plant and another one in Oakville -- which are both in Liberal-held ridings.