A major power interruption is set for the Kapuskasing area next month. All Northern Ontario Wires customers in Kapuskasing as well as Hydro One customers from Calstock, Hearst to Moonbeam will be without power on Sunday, July 12th from 7 am to 5 pm, a total of 10 hours. Hydro One officials say this interruption is necessary to perform upgrades on the transmission system.