There have been a number of reports in the press in recent weeks about the true viability of rooftop domestic wind turbines. It is generally reported that these turbines, available from as little as £1500, can knock a third off your electricity bill, but this claim appears to have been quashed. David Gordon, chief of turbine manufacturer Windsave, is reported to have said that with a turbine height of "between 4-6 metres you'd save about £10 a year" but that from "6 metres onwards... you could save... £50 to £100". Visit the BBC for more information on this.
The Sustainable Energy Group and DTI Renewables Advisory Board have also made similar comments. Take a look at The Mirror for more details.
The alternative to rooftop turbines are the ground mounted models which stand in a building's grounds. In either case, however, it is certainly important to ensure that the proposed location has sufficient wind to provide the amount of electricity required.