It will provide its SG-8.0-167 DD turbines for what will the world’s biggest offshore wind farm when operational in 2022.
The manufacturer will produce the majority of the blades and carry out pre-assembly work at its factory in Hull, north-east England, and also expects towers to be "partly sourced" from UK suppliers.
Siemens Gamesa added the nacelles for the turbines would be made at its new factory in Cuxhaven, northern Germany.
Ørsted has previously selected Siemens Gamesa as turbine supplier for several of its UK projects: Hornsea Project One, London Array, Race Bank, West of Duddon Sands, Walney Extension East and Westermost Rough.
The two have also teamed up for Anholt off the coast of Denmark, and Borkum Riffgrund 1 and Gode Wind 1 and 2, which are in German waters.
Siemens Gamesa unveiled the SG-8.0-167 DD model, which has a power-mode option to hit 9MW, at WindEurope’s annual conference in November. It will also be used at Vattenfall’s Kriegers Flak in the Danish Baltic Sea and Vesterhav North and South projects.
The manufacturer claims the turbine’s 81.5 metre-long blades deliver an 18% wider swept area and 20% more annual energy output (AEP) than its predecessor, the SWT-7.0-154.
In its standard 8MW mode, more than 170 units of the SG-8.0-167 DD would be needed to reach Hornsea Project Two’s 1,386MW capacity, while in the turbine’s 9MW power-mode option 154 units would be needed.
Ørsted had secured a contract for difference (CfD) deal worth £57.50/MWh (€64.10/MWh) for Hornsea Project Two in the UK’s second auction round in September — a strike price 50% lower than those reached in an earlier round two years earlier.
Duncan Clark, Ørsted’s programme director for the project, said: "Hornsea Project Two is a game-changing renewable energy project in terms of both size and cost, and this selection is an important step in the procurement and construction process."
This month, the developer also began work on a new operations hub in north-east England, from where it will serve its North Sea offshore sites, including Hornsea Project Two, and its 1.2GW Hornsea Project One site, currently under construction.