Vattenfall has confirmed its order to Siemens Gamesa to supply turbines for the 1.5GW Hollandse Kust 1-4 wind zone off the Dutch coast that will be the world’s largest once it is fully operational, which is expected in 2023.

The firm order encompasses the supply, delivery and installation of 140 of the OEM’s SG 11.0-200 DD offshore wind turbines, according to a note to the Spanish stock market regulator.