Source: Jason Warick, CBC News, December 5, 2018 

SaskPower says outage caused by heavy frost on the power lines, Lights back on across most of Saskatchewan

An expert in North American electrical grids says he has never seen frost cause a major power outage.

“This isn’t the craziest I’ve heard, but it is an unlikely explanation,” said Robert McCullough, who has 40 years of experience consulting for public utilities and private energy firms in Canada and the U.S.

“It doesn’t mean it hasn’t happened. It just means in my 40 years in the business, I just haven’t seen it.”

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Image Source: SaskPower/Twitter