The Ontario Ombudsman's report was the largest investigation in the office’s history. It revealed a litany of egregious problems with billing and customer service arising from Hydro One’s disastrous installation of a new customer information system in May 2013, which affected more than 100,000 customers. File photo

A new customer information system installed in 2013 is at the heart of widespread billing problems at Hydro One, Ontario Ombudsman André Marin reported Monday.“Hydro One lost ...

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