Wind
Wind turbines fall into three main categories: micro, medium, and large. Medium and large turbines are a mature and reliable technology. The larger the wind turbine, the better the performance. Large turbines are those that generate more than one megawatt, and these represent the most effective of all renewable energy technologies currently on the market. It is also often the most controversial though, but studies undertaken by Ipsos on behalf of the British Wind Energy Association have revealed that 74 per cent of the people surveyed were in favour of wind turbines.
There will be few developments lucky enough to have sufficient land and space for larger wind turbines. In addition, noise, shadow flicker and migratory birds are key considerations. Further information on the relationship between power and diameter can be found by clicking here.
Generally speaking, micro turbines are turbines that can be mounted on buildings, while medium size units are tower-mounted and rated from around a few kilowatts to a few hundred kilowatts. The recent Warwick Wind Trials, an important study into the effectiveness of micro-wind turbines, demonstrated that micro wind is only effective when very carefully sited. Click here to view PDF (7.1MB)
The United Kingdom has the greatest wind energy potential in northern Europe. BERR provides access to the NOABL wind speed database which can be used to gain an indication of energy production at a given location. Medium and large schemes should undertake site analysis for a minimum of one year as part to gain an accurate assessment of the available resource
Summary
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Turbine blades convert airflow into rotation that drives a generator
- Capacity factor: 20-40% for large wind; 1-10% for small wind
- Constraints: scale, land area, wind resource, access to the grid, controversy, turbine availability
- Advantages: large wind is commercially attractive
- Typical lifespan of 20 years
Case Studies
- Single high-mast-mounted wind turbine
- Site located on a hill in an exposed location
- Installed by Equinox Energy
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Case Study - Brill School Renewables Portfolio (PDF 226 KB)
Links
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British Wind Energy Association: http://www.bwea.co.uk/
- For planners: Case Study - Somerset Wind Initiative (PDF 167 KB)
- Short technology summary: Regen SW Wind Energy Information Sheet (PDF 170 KB)
- Primer on micro-wind: Regen SW Micro-Wind Information Sheet (PDF 296 KB)
- Publication by BRE: Micro Wind Turbines in Urban Environments
