All 67 turbines are now in place and producing power at at the Dudgeon Offshore Wind Farm off the coast of Norfolk.
Testing of the last turbines will be done in October before being handed over to operations.
The farm, owned by a subsidiary of Statoil, can power as many as 410,000 UK homes.
The towers, nacelles and blades have been shipped from Denmark to the new Siemens pre-assembly and load out site in Hull.
The towers have also been assembled here. Since January the installation vessel Sea Challenger has arrived in Hull 17 times to pick up turbine sets for installation offshore.
In the operational phase Dudgeon will create 70 UK jobs.