Western Power Distribution is working to restore electricity supplies to almost 400 homes in Exeter.
Currently, 383 properties have no power.
The problem was reported at 9.32am today.
Work is being carried out in a bid to restore supplies by 2pm.
The problem is impacting addresses in more than 20 postcodes in the city.
Western Power Distribution has categorised the power cut as a low voltage incident, meaning it is localised.
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