RWE said it scaled back the capacity of the farm from a maximum of 1,200 megawatts to between 600 and 900 megawatts. The company said the decision was made to ensure wind energy is competitive when weighed against fossil fuels.
The company said the onshore infrastructure associated with Triton Knoll would be about half the size as originally planned.
"Triton Knoll's significant contribution of reducing the U.K.'s carbon emissions and tackling climate change, can now be achieved more efficiently whilst having less impact on the surrounding environment and communities," project manager Jacob Hain said in a statement.
The British government set a goal of getting 30 percent of the country's electricity generated by renewable resources by 2020.
RWE said Triton Knoll would be able to meet the energy needs of more than 550,000 British households.
Triton Knoll is still in the development phase and no time frame for commercial-scale power generation was announced by RWE.