Exports of Ontario power netted the province $31.3 million in May by trading electricity with the U.S. and other provinces.
In a June 9 release, the Ministry of Energy says Ontario has collected $136 million this year in total net export revenues.
Ontario is part of an interconnected North American power grid that allows the province to buy and sell electricity. The Independent Electricity System Operator operates the wholesale electricity market to balance the province's supply and demand.
The provincial grid is connected to Manitoba, Quebec, New York, Michigan and Minnesota. The government has collected $1.5 billion through exports since 2006.