Today, about 200 operating hydroelectric plants produce over 8,000 megawatts of electricity. This hydropower makes up the vast majority of Ontario’s total renewable energy supply.
Most of Ontario’s large waterpower sites have been developed and many of the existing sites have been refurbished.
Developing the remaining commercially viable sites and upgrading others will make a modest but strategically valuable contribution to expanding Ontario’s low-cost, low-carbon electricity supply.
Hydroelectric power, together with greenhouse gas emission free nuclear generation, provides Ontario with one of the lowest-carbon electricity systems in the world. These sources also supply more than 70 percent of Ontario’s electricity.
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