Meet Calgary's mayoral candidates

 A total of 27 candidates are vying to become Calgary's next mayor, 24 of whom are pictured in this compilation. (supplied images) A total of 27 candidates are vying to become Calgary's next mayor, 24 of whom are pictured in this compilation. (supplied images)

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Explainer: Where do hydro poles come from?

The devastating storm in southern Ontario and Quebec last weekend damaged thousands of hydro poles across the two provinces. CTVNews.ca gives a rundown of where utility companies get their hydro poles from, as well as the climate challenges in the grid infrastructure.