At the same time, the council of ministers – equivalent to a cabinet - also has extended the concession period for the two offshore arrays to 22 years from the 20 years previously granted.
"The revision of the [support] mechanism ensures a saving of more than €1bn ($1.12bn)," energy minister Marie Christine Marghem said.
"We avoid excessive subsidies and at the same time provide the support needed for the development of renewable energy."
The minister added that the government through the decision has found equilibrium between consumer interests and the necessary development of North Sea wind parks.
The proposal also says that the green certificate-based support for Norther is expected to be €124 per megawatt hour of produced electricity, and €129.80/MWh for Rentel.
Norther, which is being developed by Dutch developer Eneco and Belgian energy producer Elicio (formerly Electrawinds), has named MHI Vestas as preferred turbine supplier, and intends to use the manufacturer's 8MW offshore turbine.
The consortium developing Rentel has confirmed Siemens for the supply and installation of 42 of its SWT 7.0-154 turbines.
Rentel is part of the Otary partnership that includes several Belgian renewable energy specialists, such as Elicio.
Otary also holds a concession for the construction of the Seastar and the Mermaid offshore wind projects.
The amended support is only valid for Rentel and Norther, and doesn't apply to the less advanced future offshore projects Mermaid, Northwester II and Seastar off the Belgian coast.
For those projects, the offshore sector is still waiting for the government to come up with a new support mechanism later this year that many think like in neighbouring countries will be based on tenders to satisfy EU regulations.
