Almost 7,000 homes in south Oxfordshire are without power after workmen pulled down a high-voltage electricity cable.
A spokesman for Southern Electric said no one was hurt in the incident at a building site in the Milton area about 10.10am, but it had affected homes and businesses in the Sutton Courtenay, Didcot and Milton areas plus surrounding villages.
She said engineers were on scene trying to reroute the supply and hoped power would be fully restored by about 2pm.
For more information call Southern Electric's customer emergency service line on 08000 727282.
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