Canada’s ‘green energy’ transition has begun. By 2035, the federal government is aiming to achieve a net-zero electricity grid. But is it possible? And is one of the answers to help in that transition in front of us right now? With an expected increase in energy demands, how does the aging technology of hydroelectric power plants factor in and how essential are they now to keep everything running?

The Globe’s environment data journalist, Matt McClearn, explains how important hydroelectricity is to Canada’s energy infrastructure and looks into whether the cost of keeping hydro dams in business is justified.

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