In The Hill Times' energy policy briefing published on Dec. 2, 2019, an opinion piece stated that, “Hydro reservoirs the world over are known methane sources." The piece also raised doubt about the impact of the Site C dam in British Columbia on climate change. It posed the question “what are the projected methane emissions that will occur when a third hydroelectric reservoir is created?” without providing the answer which is on the public record. Let me clear the water. Methane is a powerful greenhouse gas. Both natural and artificial waterbodies do emit methane. But methane emissions are a function of climate and oxygenation. Hydro reservoirs in Canada are colder and more oxygenated than the global average. Therefore, and, for example, the methane emissions from boreal and northern hydro reservoirs in Canada cannot and should not be equated to those in the balmy tropics. The Site C dam was required to submit a lifecycle greenhouse gas emissions study to Environment and Climate Change Canada to receive its federal environmental approval. Following the guidelines published by the Intergovernmental Panel on Climate Change, Site C was calculated to emit ten-and-a-half grams of greenhouse gases per kilowatt hour on a lifecycle basis. This is comparable to wind energy and 40 times lower than the level of greenhouse gases emitted from the combustion of natural gas for electricity generation. The independent joint review panel that assessed Site C found “the assessment conducted by BC Hydro with respect to the project’s contribution of GHGs is accurate and that the project-related emissions would be considered low.” Canadians should know and be proud that our electricity supply has the lowest lifecycle greenhouse gas emissions of all G7 nations. Why? Because 60 per cent of our annual electricity generation is from hydropower. And Canadian hydropower has one of the lowest lifecycle greenhouse gas emissions intensities of any energy resource available in North America today. Patrick Bateman Vice-president, government and regulatory affairs WaterPower Canada Ottawa, Ont.