Ontario’s new government hinted at more green energy project cancellations a day after the province pulled the plug on a nearly completed wind farm whose closure could cost electricity ratepayers C$100-million ($76 million).

Ontario Lt. Gov. Elizabeth Dowdeswell, who holds a largely ceremonial role, delivered the new provincial government’s first Speech from the Throne July 12, the method Canadian governments typically use to outline their legislative priorities.

The new government would respect “the wishes of...