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The world鈥檚 first year-long customer field trial looked at 26 grid-connected micro wind turbines from five manufacturers on sites across the UK between October 2007 and November 2008.

Encraft said the research suggested that a turbine鈥檚 performance would make a significant contribution to a building鈥檚 energy and carbon saving 鈥渙nly on the most exposed sites and tallest buildings鈥�.

Other findings include:

• the average energy generated per turbine per day is 214Wh, sufficient to power four 9W low energy lamps for five hours a day
• the value of average power consumption produced per site per year, at a typical electricity cost of 拢0.1452 per kWh, is 拢33.39
• the best performing turbine produced electricity worth 拢126.18
• on the poorest site the electricity generated was less than the energy required to run the electronics of the turbine.

The report emphasises how much a turbine鈥檚 performance is linked to its location: turbines on high-rise sites generated as much energy in one month as other turbines in the trial did in one year.

Encraft specialises in microgeneration, on-site renewables and low carbon buildings. The trial was funded by Pilkington Energy Efficiency Trust, Warwick district council, BRE Trust and homeowners. It was supported by the Department of Enterprise, Trade and Investment, the British Wind Energy Association, Warwickshire county council, Action 21 and the Micropower Council.