The US government on Tuesday released a long-awaited draft supplement to its 2019 environmental review for the pioneering 800MW Vineyard Wind offshore project and expects to issue a final permitting decision on 18 December.

Completion of the 420-page Supplemental Environmental Impact Statement (SEIS) after 10 months is a boost for the delayed $2.8bn project and the broader US industry, which is awaiting progress on federal approvals to build more than 6.4GW