FIRMS on Blackpool Business Park were plunged into darkness this morning following a high voltage fault.
Electricity North West confirmed the problem in the area around Avroe Crescent was due to damage to equipment.
Engineers were sent to the scene to restore power around 7am and said it could take between three and nine hours to rectify the problem.
A spokesman for Electricity North West added: “We have a high voltage fault affecting Blackpool.
“This fault is due to damage to our equipment. Our engineers are aware of the problem.
“We expect customers close to the point of damage will be restored by 4.30pm today.
“This is our best estimate at this time and may change as additional information becomes available. We apologise for any inconvenience caused by this interruption.”