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Publication type: Working paper – expertise – study
Title: Ökobilanzierung des Rückbaus von Windkraftanlagen
Authors: Eymann, Lea
Stucki, Matthias
et. al: No
DOI: 10.21256/zhaw-25941
Extent: 47
Issue Date: 20-Dec-2016
Publisher / Ed. Institution: Bundesamt für Energie
Publisher / Ed. Institution: Bern
Language: German
Subjects: Ökobilanzierung; Life cycle assessment; Windenergie; Erneuerbare Energie; Fussabdruck; Clean energy
Subject (DDC): 333.79: Energy
Abstract: Wind energy production in Switzerland will be expanded as part of the 2050 energy strategy. When wind turbines are dismantled at the end of their life-span, large amounts of materials need to be dis-posed of. There are various decommissioning options for the foundation of such an installation: it can either be left on the site, partially dismantled or completely removed. While it is clear that dismantling the entire foundation is associated with high costs, the environmental impact of the different decom-missioning options has yet to be investigated. Therefore, in this study, the environmental effects of dismantling wind turbines, and more specifically dismantling their foundations, is evaluated using life cycle assessment (LCA). Two different perspectives are taken into consideration in the life cycle assessment of the decommis-sioning process. In the first perspective, only the environmental impact which can be attributed to the demolition work, the transport for the decommissioning, and the disposal and recycling of materials are taken into account. In the second perspective, additional credits for the recycling of valuable mate-rials are also included in the calculation. In this way, the second scenario takes into consideration the fact that returning materials to the materials cycle contributes to the prudent use of natural resources. Viewed over the entire life cycle of a wind turbine, the decommissioning phase is responsible for 6-9% of the greenhouse gas emissions. The dismantling of the foundation is responsible for a maximum of 3% of the greenhouse gas emissions of wind-powered electricity. The results of the LCA for each of the dismantling options are strongly dependant on the point of view taken: if no credit is given for re-cycling materials, the option where the foundation is not removed or only partially dismantled per-formed best. If, on the other hand, recycling credits are used in the calculation, the best result was given by for the option where the foundation is completely removed and the materials are reused. The recycling of steel in particular makes sense from an ecological point of view, since recycling does not require energy-intensive production of pig iron. Regardless of the approach, it can be said that the returning of materials, in particular metals, to the materials cycle, contributes to the favourable environmental balance of wind power.
License (according to publishing contract): Licence according to publishing contract
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Published as part of the ZHAW project: Ökobilanzierung des Rückbaus von Windkraftanlagen
Appears in collections:Publikationen Life Sciences und Facility Management

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