Ontario NDP Leader Andrea Horwath announced Friday her party will vote against the budget tabled this week by the minority Liberal government, meaning a June election in the province is now all but inevitable.

"I have lost confidence in Kathleen Wynne and her ability to govern," Horwath said.

UPDATE: An election has been called in Ontario for June 12.

In a campaign-style speech at Queen's Park, Horwath listed off a number of examples of what she sees as mismanagement from Wynne's Liberals, including the gas-plant scandal.

She said Liberals haven't kept the promises they made to the NDP in last year's budget, so she can't trust them to keep the 70 new promises made in Thursday's budget.

She also called the $130.4-billion spending blueprint a "mad dash" to escape scandals surrounding the cancellation of gas plants in Oakville and Mississauga and the Ornge air ambulance service by promising voters "the stars and the moon."

"We will not be voting in favour of this budget," she said. "It is time for the people to make a decision. I trust the people of Ontario to make a decision."