Two 125-metre wind turbines will be built on farmland in rural Carmarthenshire after a campaign to stop their construction was blocked at the High Court.

The “supersized” turbines will be built on land to the north of Rhydcymerau, between Brechfa and Llanybydder and around 20 miles to the north of Carmarthen.

Planning permission for the two turbines was initially granted more than two years ago following an application by Energiekontor UK Limited, a private company that develops wind farms.

That permission, granted by Carmarthenshire Council, was on the condition that each turbine would only be 100 metres high.

However, the company behind the plans later applied to lift the height limit to 125 metres, a request which was denied by the council but granted by a government planning inspector.

The wind turbines will be erected in the Rhydcymerau area of Carmarthenshire

This decision has been the subject of fierce criticism by local resident John Finney and campaign group Villages Against Supersized Turbines (VAST).

They argued that the new size limit would see an increase in the blade length on each turbine of 43% and the area swept by the rotating arms would increase by 104%, and that the change in height represented a “fundamental alteration” to the original planning permission rather than merely varying it.

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However, senior judge, Sir Wyn Williams, has now dismissed the complaints, ruling that the government inspector, Janine Townsley, correctly applied the law when she granted the planning permission.

The judge said the challenge from opponents was based on an “over-technical” and “inflexible” approach to the inspector’s powers.

He added that Ms Townsley carried out a “meticulous planning appraisal” of the turbines and was in no doubt that she had specifically considered whether varying the condition would fundamentally alter the original plans.