Work has begun on building two wind farms in Northern Ireland. Renewable Energy Systems (RES) in England has won turnkey contracts to build both wind farms -- each of ten turbines at Corkey in County Antrim and Rigged Hill in County Londonderry. The schemes have been developed by B9 Energy Services of Larne which will operate and maintain them. RES has chosen 20 Nordtank 500 kW turbines, modified for the high wind speeds of over 9.5 m/s at both sites. The projects are expected to start operation around the end of the year when they will be handed over to the owner, Scottish Power. Planning permission for B9's third NFFO contract site at Elliot's Hill, Co. Antrim is anticipated at the end of September.