Domestic wind turbine producers should be clearer on the use of micro-wind turbines, according to green consultants Encraft.
In a study of 39 small-scale wind turbines, the group discovered that in some cases they provided sufficient electricity to power an energy efficient house, but in other cases didn't generate enough to power a lightbulb.
The Coventry Telegraph reports that Encraft managing director Matthew Rhodes said: "We know wind power is a fantastic renewable technology in the right place. But, unfortunately, near trees and buildings is not the right place."
Tests carried out on turbines bought by participants themselves showed variation between them of a factor of "more than 20", a fact he claimed allowed salespeople to mislead customers.
Mr Rhodes said: "We all know they work on tall buildings and near the coast so why not just say that. If providing this information means customers choose to buy loft insulation or solar panels rather than wind turbines for some houses then this is properly-informed market economics working well."
Domestic wind power could help homes reduce their energy costs, if they generate enough electricity.
They could also earn homeowners above-market payments for any electricity sold to the National Grid.
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