A new type of small wind turbine for home electricity generation, intended to match the popularity and potential of solar power, is being developed in Europe.
This will be the second time that attempts have been made by the European Commission (EC) to get wind turbines generally accepted for domestic and small-scale commercial use.
Fifteen years ago, before solar panels became affordable, small wind turbines fixed to house roofs and chimneys were heralded as one of the best ways of helping to save the planet from global warming and cutting household bills, but it was an energy revolution that petered out.
The problem was that the turbines frequently vibrated and made an unacceptable noise, while wind in urban areas was often too turbulent for efficient use.
Although 940,000 small wind turbines were in use around the world by the end of 2014, they are generally uneconomic, and it is a revolution that has yet to happen.
Despite these setbacks, the dream of small-scale turbines has refused to die, and a combination of European Research grants and co-operation between engineers and researchers has led to the development of a new generation of turbines.