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2001 European Wind Energy Conference and Exhibition EWEA Bella Center, Copenhagen, Denmark, 2-6 July 2001 3. ASSUMPTIONS AND BOUNDARIES The foundations and wind turbine are included in this LCA, while the grid connection is disregarded. It means that this LCA only deals with the wind turbine itself, and does not include the distribution of the generated electricity. Not all materials are included, as this is unrealistic to achieve. The goal has been to include a certain amount of the materials, as follows: • 80% of the weight of all materials for the nacelle • 95% of the weight of all materials for the tower • 90% of the weight of all materials for the blades • 90% of the weight of all materials for the foundations In this study the nacelle is taken to comprise the generator, gear, transformer, control electronics, cables etc. The above-mentioned goals have been reached. But for some materials/products the information has been inadequate, and here the information has been estimated from identical products. The LCA is based on the following main assumptions: • A production of 8 GWh/wind turbine per year. • A wind turbine lifetime of 20 years. • No replacement of main components during the lifetime. 4. DATA QUALITY Data on the production of the tower, nacelle and blades have been collected from Vestas Wind Systems A/S, who has collected a valuable infinite number of data through their environmental management system. Data for the materials have been collected from suppliers. Data about the production of the foundations have mainly been based on in-house information, since Tech-wise A/S is main consultant to the Horns Rev Wind Farm. Information about transport, assembly, erection, installation, maintenance and decommissioning of the wind turbine has partly been acquired in-house from Tech-wise A/S, from contractors and from Vestas Wind Systems A/S’ service department. The data are of varying quality, and the focus has been on the areas where the greatest environmental impact originate. 5. RESULTS The main result of the LCA study is an improvement of the former LCA model for wind turbines. In an LCA the result is often presented as normalised environmental impact which is also the case here. A normalisation means that the contribution from 1 kWh of electricity is related to the average contribution from a normal citizen to the relevant environmental impactPDF Image | Organisations in Different Renewables
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