Siemens is on course to secure more orders for its Hull factory after being named preferred supplier for the world's largest offshore wind farm.
Set 75 miles off the East Yorkshire Coast, Hornsea Project One will generate enough power for 800,000 homes.
Site developer Dong Energy has now announced it will use up to 171 of Siemens' 7 megawatt (MW) turbines at the site.
The machines' blades are likely to be made at the German energy giant's factory in Alexandra Dock, east Hull.
Mats Vikholm, senior vice president for Dong's wind power division, said: "Our decision to make Siemens the preferred supplier for our Hornsea Project One wind farm is a crucial step in our efforts to lower cost of electricity.
Larger and more cost-efficient wind turbines are key to reach our strategic target of reducing cost of electricity from offshore wind.
"The decision by Siemens to open new production facilities in Hull on the British east coast is a key factor in bringing down the cost of wind turbines for this project. This preferred supplier agreement will both help reduce the cost of offshore wind and create and retain real energy jobs in the UK.
Siemens' Hull factory is already set to make blades for several other wind farms.
They include a deal to supply 102 turbines to ScottishPower Renewables for the £2bn East Anglia One site off the east coast.
The firm's machines will also be used at Race Bank off Norfolk and Walney Extension Phase 2 near Morecambe Bay.
Race Bank will use 91 of its 6MW turbines and the Walney contract is subject to a final investment decision by Dong.
Michael Hannibal, offshore chief executive officer of the wind power and renewables division at Siemens, said:"We are very pleased Dong Energy has once again chosen Siemens as preferred supplier for its major UK projects Walney Extension Phase 2 and Hornsea Project One offshore wind power plants.
"Our new factory in Hull will support these projects and further promote the growth of the UK offshore industry."