Northern Powergrid is upgrading underground power cables as part of a £4.7 million infrastructure improvement project throughout Seaham and Ryhope.
The investment, which has already started, will see the region's electricity distributor carrying out a series of works across the region including the replacement and installation of 13.9 kilometres of underground power cables and replacement of 5.9 kilometres of overhead power lines.
Northern Powergrid will also refurbish 18.2 kilometres of power lines, replace 61 support structures and install 71 remote controlled smart switching devices at 41 locations which will help automatically restore power for customers quicker if their lights should go off in the future.
Peter Taylor, zone manager at Northern Powergrid, said: "This £4.7m investment is great news for all of our customers in Seaham and Ryhope. The work we are doing will provide a safe, secure and reliable power supply for years to come, increase flexibility across our network and support the continued economic growth of the two towns.
As part of the investment Northern Powergrid and its contractors are currently working in the North Lea area of Seaham where it has started excavations as part of a scheme to install a new substation on New Strangford Road, replace a substation on Durham Street and lay new underground cables.