The second phase of a major £3.8m engineering project to upgrade the electricity supply to about 16,800 residents in Chorley will begin next week.
Electricity North West completed the first phase last summer, and will now put in place 5km of underground cable between Town Lane in Wrightington and Woodfield Road in Chorley.
The project, due to be completed by February, will replace oil-filled cables which have been in place for about 50 years, with new environmentally-friendly and efficient cables.
Major projects manager, Tim Groom, said: “This essential project will help provide a secure power supply to thousands of local homes and businesses in Chorley for many more years to come.”
He said there may be some disruption, but the long-term benefits for residents and businesses would be “worth it”.