The lost of revenue will be greater than any savings, the Financial Accountability Office says.
The federal government is tweaking guidelines for some heavy polluters.
Premier Doug Ford's office says the government will hand over documents.
His government will wind down all green programs funded through the system.
Ontario PCs take power at the end of the month.
Federal environment minister announced funding for a green home-retrofit program.
The contenders have pledged to fight the feds on the issue.
Quebec and British Columbia include the cost as a separate line item.
Brown moves to dispel the notion he's too right wing to win.
A day after Finance Minister Charles Sousa unveiled the Liberal government's 2016 provincial budget, Premier Kathleen Wynne