Utsläppsminskning per extra investerad krona : En kostnadsnyttoanalys för en VA-ledning på Hisingen med hjälp av en klimatkalkyl

Sammanfattning: This project presents a cost-benefit analysis for a water and sewage pipeline project in north  Hisingen, Sweden, with a focus on the climate impact of the project. Specifically, the project examines the emissions in carbon dioxide equivalents from the project per invested Swedish krona, using a climate calculation. The results of the analysis provide important information about the cost-benefits of the project, and can be used to guide decision-making regarding pipe network investments in the future. Overall, the project highlights the importance of considering both the financial factor and greenhouse emissions in infrastructure planning and investment. The study analyzes the difference between fossil and bio-based PE-pipes and construction with open excavation and directional drilling. The results of this study gave the following conclusions: The production phase of materials in the construction stage of the life cycle has the biggest impact on the climate in water and sewage construction projects.Switching material from fossil-based to biobased has a bigger positive impact on the emissions than switching construction methods from construction with open excavation to construction with directional drilling in water and sewage construction projects. Of the four cases analyzed in this project, the case with fossil-based PE-pipes and directional drilling has the least amount of invested Swedish krona per ton carbon dioxide reduction. It is possible to reduce costs and decrease emissions simultaneously during the construction phase of a water and sewage project by switching the construction method from open excavation to directional drilling. These findings highlight the importance of considering the environmental impact of  infrastructure projects in decision-making and prioritizing sustainable solutions for future investments. In particular, the results suggest that material choice has a greater impact on emission reduction than construction methods.