Electricity North West said it was working to restore power to 37 properties in Blackburn this evening.
The affected properties are in the Wensley Fold area and power is due to be restored by 7.30pm.
A further 63 properties are affected in Longridge and it is not known when the issue will be fixed.
Electricity North West said: “This power cut has been caused by an unexpected incident with the underground cable that provides electricity to your home or business. We didn't know before your electricity went off that this was going to happen but now we know, rest assured we will get your power back on safely and as quickly as possible.
“Please note that all our timescales are estimated based on previous experience and may change if new information becomes available while our engineers are fixing the issue.
"With underground power cuts, we may need to dig to repair the cable and this can sometime extend the length of time you are without power.”
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