Abstract
Biogas plant managers often face difficulties in obtaining feedstock at stable and affordable prices. The context in which the biogas plant manager needs to purchase the feedstock could be important when the biomass is also used in valorization trajectories besides anaerobic digestion. Using a combination of qualitative research and agent-based modelling, we investigated the effect of market context on the purchase of local biomass for anaerobic digestion. This paper details the institutional arrangements of our case study, the silage maize market in Flanders and the results of a scenario analysis, simulating nine different market contexts. Silage maize is an interesting case study, as it is both used for feed by farmers and as an input in biogas plants. The results show that mainly the time of entry into the market explains the difficulties in obtaining a stable supply of silage maize to biogas plants. Furthermore, we found a silage maize price increase for farmers in competition with a biogas plant, especially in case of a silage maize deficit in the market. The different institutional arrangements used have no significant effect. Our findings may guide biogas plant managers in assessing and reducing the consequences of the establishment of a biogas plant, competing for local biomass resources.
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Notes
Decree of 8 May 2009 Decreet van 8 mei 2009 concerning general provisions relating to the energy policy (Decreet van 8 mei houdende algemene bepalingen betreffende het energiebeleid). [2]
Often other arrangements are part of the agreement as well, such as the deposition of manure by the buyer on the fields in question.
Dutch net energy system for dairy cows.
Silage maize yields can differ largely between years due to the weather conditions. As a result, farmers with a silage maize surplus still tend to plant a surplus of silage maize in order to protect themselves from a possible bad harvest. Consequently, they will not easily switch to other more profitable crops.
As farmers generally do not know themselves the exact volumes that were harvested and biogas plant managers are quite protective of their accountancy data, we were not able to gain access to quantitative data on exact prices and volumes to confirm this statement.
The equations to calculate these prices can be found in the ODD. We related this to the prices of an alternative feedstock called Ecofrit, an alternative feedstock for biogas plants composed of several products, including organic biological waste, glycerine, fats, grains and others. The biogas potential of this alternative feedstock is known to be between 160 and 185 Nm3/t depending on the exact composition.
In this paper, trust is used in the sense of loyalty towards another agent to keep the trading relationship going.
We made this choice in order to be able to compare the prices paid by the biogas plant, as for scenarios 2 and 3, he is only present on the market at year 10.
For all statistical significance tests, we used a Mann-Whitney U test
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Acknowledgments
The work of Anouk Mertens is supported by the Agency for Innovation by Science and Technology of Flanders (IWT Vlaanderen, 131479). We would like to thank the interviewees for providing inputs and valuable insights into the issues discussed.
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Mertens, A., Van Meensel, J., Mondelaers, K. et al. Context Matters—Using an Agent-Based Model to Investigate the Influence of Market Context on the Supply of Local Biomass for Anaerobic Digestion. Bioenerg. Res. 9, 132–145 (2016). https://doi.org/10.1007/s12155-015-9668-0
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DOI: https://doi.org/10.1007/s12155-015-9668-0