The proposals for 200 turbines about 15km (nine miles) off Llandudno have run into opposition, and First Minister Rhodri Morgan wants a public inquiry.
Work would begin in 2010 if approved by the Department of Trade and Industry.
Npower renewables, which submitted its initial application in November 2005, has said the development would generate enough electricity for 500,000 homes, and prevent about two million tonnes of carbon dioxide being released each year.
A protest group called Save Our Scenery has claimed it would spoil the area, although there have also been demonstrations in favour.
The call for a public inquiry was made by Mr Morgan shortly before the Welsh assembly election in May.
Conservatives said they also wanted an inquiry, and both Plaid Cymru and the Liberal Democrats said during the campaign that the final decision should be devolved to the assembly, rather than made by the DTI.
The developer is now submitting revised plans to the UK government and other organisations, along with new environmental information.
The firm said it had responded to consultation by carrying out extra work "to clarify the potential environmental effects of the project and the measures which can be taken to minimise them".
Npower said its further design work would reduce the effect on the view at a points, including those from Conwy mountain, and at Llandudno from the Great Orme and the promenade.
Work would begin in 2010 if approved by the Department of Trade and Industry.
Npower renewables, which submitted its initial application in November 2005, has said the development would generate enough electricity for 500,000 homes, and prevent about two million tonnes of carbon dioxide being released each year.
A protest group called Save Our Scenery has claimed it would spoil the area, although there have also been demonstrations in favour.
The call for a public inquiry was made by Mr Morgan shortly before the Welsh assembly election in May.
Conservatives said they also wanted an inquiry, and both Plaid Cymru and the Liberal Democrats said during the campaign that the final decision should be devolved to the assembly, rather than made by the DTI.
The developer is now submitting revised plans to the UK government and other organisations, along with new environmental information.
The firm said it had responded to consultation by carrying out extra work "to clarify the potential environmental effects of the project and the measures which can be taken to minimise them".
Npower said its further design work would reduce the effect on the view at a points, including those from Conwy mountain, and at Llandudno from the Great Orme and the promenade.