Wind turbines are to grace the roof of the London headquarters of the Royal Institute of British Architects (RIBA) after Westminster Council gave its consent to a one year demonstration project. Two 2.5 kW Proven wind turbines are to be installed on the building in Portland Place. "Planners have given us a 12 month permission for installation but we hope to be able to extend that," says RIBA's Martin Pascoe. Wind measurement tests and an acoustic survey show the 13 metre high turbines are not expected to cause noise pollution. The £50,000 project's aim is to promote sustainability and demonstrate the use of turbines in an urban environment, says Pascoe.