The federal US government has finalised the lease of a 122,405-acre (500 sq km) offshore wind development zone facing North Carolina that was won earlier this year by Avangrid Renewables, paving the way for more than 1GW to be built off the southeastern US in the 2020s.

Avangrid, the US utility holding company controlled by Spanish energy giant Iberdrola, won the Kitty Hawk lease with a $9.1m