March 1 (Reuters) - Ontario's power grid operator expects more than 3,200 megawatts (MW) of renewable capacity to be connected to the transmission system, while the province's remaining coal-fired plants will shut over the next 18 months. In a report published on Thursday, the Independent Electricity System Operator (IESO) said the renewable capacity includes the Canadian province's first two transmission grid-connected solar projects. By August 2014, the IESO said total wind and solar g