A Hull factory will supply wind turbine blades for Scottish Power in a contract worth more than £1bn.
Siemens Gamesa will manufacture the blades for 64 turbines, which will be installed at the East Anglia TWO windfarm off the Suffolk coast.
Darren Davidson, UK head of Siemens Energy and Siemens Gamesa, said the deal would allow the firm to plan for the long term in Hull and was a "real positive" for job security.
Charlie Jordan, chief executive of Scottish Power Renewables, said the £4bn windfarm would provide enough green energy to power more than a million homes.