Scottish Power says thousands of customers across north Wales are currently without power after cables were blown down by Storm Doris.
It says the situation is "fluctuating" but engineers are currently working to restore connections.
Anglesey has been particularly affected with many business saying they have had to close.
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Arriva Trains Wales says twelve trains were damaged by hitting fallen trees and services will be affected this morning.
Yellow and amber warnings of strong winds remain in place across Wales, as Storm Doris batters the UK.