There were concerns the wind farm would interfere with the Ministry of Defence radar system
The Ministry of Defence (MoD) has withdrawn its objection to five offshore wind farms which it feared would affect its radar in Norfolk.
The MoD was concerned that turbines would interfere with its radar at RAF Trimingham, which detects aircraft threats.
RenewableUK, which is behind the £7bn wind farm projects, has agreed to partly fund new radar technology.
The MoD has lifted its objections to construction at five offshore sites.
About 1,000 wind turbines are planned for the area and will generate power for 1.7m homes.
The five sites include Sheringham Shoal, which is already under construction and will consist of 88 turbines.
Another site is planned off the coast near Cromer.
The government will also contribute towards the new radar, which will be in operation at Trimingham by October 2011.
Nicola Vaughan, head of aviation at RenewableUK, said: "RenewableUK is pleased that the objections by the Ministry of Defence to the development of these offshore wind farms... can now be lifted.
"Working together with government, the wind energy industry has proved that obstacles to such developments can be overcome in the interests of the UK as a whole."