small scale wind power

Small wind turbines suitable for properties with sufficient space are available from 600W upwards. Well-sited turbines can generate tangible amounts of electrical energy over a full year and are an effective renewable technology in the right contexts. A 1-2kW turbine would have a rotor diameter of around 3m and in our trials these have generated up to 900kWh a year on good sites. In exceptional circumstances (for example windy and exposed Scottish hilltops) this size of turbine can generate up to 2000kWh in theory.

The output (hence payback) of wind turbines varies significantly depending on location. The same turbine can generate 20 times as much energy on one site as it does on another less than a mile away. Common sense and experience are very important in siting systems, and ideally you should measure actual wind speeds in the location you plan to install any turbine for a year before making your investment. You should also be wary of your own perceptions (we all think we have windy locations in the UK!) and sales messages which will always tend to err on the optimistic. Wind power is a super technology, but one which repays rational and careful customer research.

Larger turbines can be installed if you have space: a 6m diameter turbine might generate up to ten times the energy of a 2m diameter turbine on the same site.

Some companies are now racing to offer roof-mountable turbines, that can be fitted directly to properties. Encraft can tell you the potential benefits of these turbines in your postcode area by doing the necessary calculations for you.

The main issues in choosing wind power relate to planning permission, which can become onerous if your tower height exceeds 7m. You also need to consider the cost of foundations, which will vary by site, and of connecting to the grid or your property. Micro-wind suppliers promise to eliminate all these barriers on your behalf.

Turbines work best well away from surrounding obstructions, so you get a nice smooth air flow, but this doesn't mean you can't get some power closer to buildings or trees. Ideally you should site your turbine in the windiest possible location.

The smallest turbines should cost less than £2000, although you will have to pay for towers, foundations and ancilliaries on top of this. Grants are available.

Our design tools, site assessments and evaluations from plans can provide you with a tailored estimate and specification for your needs. This will include a sizing calculation, so we can estimate a rotor diameter, power rating and cost for a turbine to suit your particular requirements.

images courtesy of iskra wind, sundog and earth centre