| Summary: | Great investments are planned in the north of Sweden the coming years, not the least in the county of Norrbotten where the projects collectively are referred to as the green transition due to the focus on fossil-free techniques. But to be able to secure a sustainable energy supply and reach the goal set by the member states of the European Union of a carbon dioxide neutral union in 2050 the production of alternative energy sources needs to intensify. The continuous phaseout of fossil energy and increased electrification, of society as well as industry, place heavy demands on the energy supply, meaning that all non-fossil energy sources become important and should increase its production to meet the ever-increasing effect need. One energy source that is produced from renewable sources and can be directly interchanged with natural gas is the methane fraction of biogas. Biomethane is currently mostly used as a vehicle fuel in Sweden but that can be subjected to change and for example become an important source of hydrogen or be used for fossil-free steel production in the north of Sweden. This thesis explored the availability of potential local substrates for biogas production in the county of Norrbotten, with certain focus on Luleå municipality. The work was performed in collaboration with Lumire (Luleå Miljöresurs AB), a municipal company that mostly produces biogas from wastewater treatment sludge and is responsible for water and sewage, as well as waste collection and recycling within Luleå. An inventory was compiled, and potential substrates evaluated in order to select two specific substrates for a techno-economic analysis with the purpose to assess energy inputs and connected costs related to the implementation of new substrates along with the potential biogas production. The energy balances included the potential energy yield, the energy consumption from the generation of the substrate, transport to the bio-gas plant, and pretreatment and was calculated for different scenarios. The effect that a biogas loss ...
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