Electricity North West has released a statement saying a 'significant fault' will mean 42,000 homes in Lancaster, Morecambe and Carnforth could be without power overnight.
The statement said: "We have been working onsite throughout the day but unfortunately due to unforeseen flood damage at that site a significant fault has occurred. We are calling for extra generators and engineers from across the country to help us to restore power to our customers.
We are committed to getting customers back on supply as soon as possible but cannot yet confirm when power will be restored, but we will issue a further update at 20:30 hours. "
Mark Williamson, operations director for Electricity North West, said: “Unfortunately power has been lost to customers in Lancaster and surrounding areas due to unforeseen flood damage at our substation.
“We are onsite and investigating the cause and we will update customers as soon as we find out more and again we would like to thank our customers for their patience and support during what continues to be an enormously challenging time for everyone involved.”
19,000 customers in Lancaster are still being supplied by generators that were mobilised overnight.