More than £1 million is to be spent re-routing underground cables on Wallasea Island in Essex.
Work is underway to convert the RSPB site into Europe's largest man-made nature reserve, but to make it happen power cables need to be moved.
UK Power Networks say that should take around 8 weeks.
Chris Tyas, the RSPB's Wallasea island project manager, said: "We are very pleased to have UK Power Networks on site replacing and realigning the power cable.
"These works will allow us to complete the RSPB's Wallasea Island Wild Coast Project.
"Completion of the work will see a nature reserve that should support over 50,000 birds along with a range of other wildlife, whilst future proofing it against climate change for decades to come."