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Authors: Güsewell, Joshua
Härdtlein, Marlies
Eltrop, Ludger
Title: A plant‐specific model approach to assess effects of repowering measures on existing biogas plants: the case of Baden‐Wuerttemberg
Issue Date: 2018 Zeitschriftenartikel 85-106 GCB Bioenergy 11 (2019), pp. 85-106
ISSN: 1757-1707
1757-1693 This is the peer reviewed version of the following article "Güsewell, J., Härdtlein, M. & Eltrop, L. (2019). A plant-specific model approach to assess effects of repowering measures on existing biogas plants: The case of Baden-Wuerttemberg. GCB Bioenergy 11, 1 (85-106). doi:10.1111/gcbb.12574" which has been published in final form at This is an open access article under the terms of the Creative Commons Attribution License (CC BY 4.0, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Abstract: Up to the latest versions of the German renewable energy act (EEG), there had been a constant growth of new biogas plants (BGPs). After reaching a stagnation in the last years, today the focus has shifted to improving the existing BGPs. Assuming that most plants have not reached the technical end of life, the question arises on how an operation can be realized beyond the initial EEG support period of 20 years. In addition, new legal and economic conditions require the implementation of adjustments, that is, “repowering measures.” Based on a method review, a plant‐specific model approach is presented to assess repowering measures for a wide range of BGPs differing in capacity, substrate mixture and agricultural structures. The techno‐economic model includes different performance indicators like levelized cost of electricity (LCOE) and temporal aspects like technical progress. Using a data set for BGPs in the state of Baden‐Wuerttemberg (Germany), results are illustrated for the different model modules and three repowering scenarios of an extended operation period of ten years. The scenarios regard different options to meet the requirements of the current EEG, namely the flexibilization and restrictions on energy crops, in comparison with a reference case. While in repowering scenarios, the number of plants decreases between 54% and 69% and the overall power capacity changes between -48% and 13% until 2035. The results further show a reduction potential in the specific area demand and GHG emission up to 12% and 24%, respectively. Technical progress, additional revenues and capacity premiums are shown to be an important factor for efficient substrate utilization, low LCOE and thereby the enabling of an extended operation period. The scenario results indicate that the agricultural areas for energy crop cultivation and the amount of manure used in BGPs will be reduced considerably, inducing new chances and challenges in the future.
Appears in Collections:04 Fakultät Energie-, Verfahrens- und Biotechnik

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