A failed substation transformer was the cause of a power outage affecting about 3,300 North Bay Hydro customers Sunday night.

The lights went out around 9 pm in the Hwy 11 North, Thibeault Terrace, Ski Club and Airport areas.

More than half were back online around 10:30.

North Bay Hydro tweeted last night that the power was fully restored just before 11:30 pm.

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