neighbourhood-planning-wind-guidance

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We are an independent national charity that shares our knowledge and experience to help people change the way they think and act on energy 3 St Peter’s Court Bedminster Parade, Bristol BS3 4AQ 0117 934 1400 info@cse.org.uk www.cse.org.uk www.facebook.com/EnergySavingAdvice www.twitter.com/@cse_bristol www.youtube/user/csebristol Charity 298740 | Company 2219673 Founded 1979
The numbers game ... Below is the illustration used on page 17 of CSE’s guidance note How to identify suitable areas for onshore wind development in your neighbourhood plan. It illustrates the point that while smaller wind turbines obviously have less visual impact, taller ones with longer blades can supply power to many more homes. So how did we get the numbers? The first thing to be aware of is that for each given ‘size’ (e.g. kW rating) of wind turbine in our illustration we’ve taken a ‘typical’ figure from within a range of possible blade lengths, heights and power outputs. So while our 10kW turbine has a blade length of 4.5 meters and is 15 meters tall, other 10 kW turbines may have shorter or longer blades or be taller or shorter in height. And likewise, depending on the turbine’s height and the wind speeds it is subjected to, it may produce more or less power in the course of a year. And we’ve deliberately erred on the conservative side. Most 100 kW turbines with a height of 30 meters and a swept area diameter of 22 meters will likely produce more than the 209,000 kWh that we have given the second smallest turbine in the graphic below. Figure 3: Comparing the annual output of different sizes of wind turbine. The figures are based on typical outputs and wind speeds and are on the conservative side. The height is measured at the hub, and is within the typical range for turbines of this rating. Each yellow square (n) represents one house. Rating: 10kW Rating: 100kW Rating: 1MW Rating: 2.5MW Diameter of swept area 9m Diameter of swept area 22m Diameter of swept area 52m Diameter of swept area: 100m Height: 15m Height: 30m Height: 60m Height: 80m Annual output: 22,800 kWh Annual output: 209,000 kWh Annual output: 2,190,000 kWh Annual output: 5,457,000 kWh Homes: 5 Homes: 55 Homes: 550 Homes: 1,350 nnnnn nnnnnnnnnn nnnnnnnnnn nnnnnnnnnn nnnnnnnnnn nnnnnnnnnn nnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnn The hub of the London Eye is about 65 meters above the ground
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