Wind power costs breakdown | Features

Micro wind turbines
	Capital cost £/turbine	Net present value for 60 years £/turbine	Expected annual output kWh
Average wind speed 5m/s
Wind turbine, rotor sweep area 2-4m2, nominal rating 1-1.5-kWh, to EN 61400-2.	2,000-2,250	4,922	700-800
Wind turbine, rotor sweep area 16 - 25m2, nominal rating 5-6-kWh, to EN 61400-2.	22,000-25,000	35,980	6,500-8,250
Average wind speed 7m/s
Wind turbine, rotor sweep area 2-4m2, nominal rating 1-1.5kWh, to EN 61400-2.	2,000-2,250	2,128	1,800-1,900
Wind turbine, rotor sweep area 16-25m2, nominal rating 5-6kWh, to EN 61400-2.	22,000-25,000	11,441	14,500-18,000
A discount rate of 3% is used to calculate net present values. Installation includes foundations or fixings, mast or tower as well as the wind turbine and direct connection to the house’s mains electrical system. Generic service life of 20 years is assumed. Maintenance allows for: inspections, servicing and minor repairs. Electricity produced is included in the lifecycle cost as an income, based on a domestic rate of £0.10/ kWh. An energy price escalator has not been applied. Lifecycle costs are based on averaged values. Electrical output based on generic power curves for turbine type, wind speed distribution Weibull shape factor of two, wind turbine height of 10m, no adjustments for air density or surface roughness. A cost analysis based on project specific information is essential for a realistic best value appraisal. BLP provides latent defect warranties for buildings www.blpinsurance.com