Planning and Optimization of Osaelva Hydropower Project
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Due to the recent nuclear disaster and the concern on climate change, the interest for developing of hydropower is booming. The promise to cut the power generator from fusil fuel and nuclear powerplant has encouraged more renewable energy production especially in European countries. In this situation, it is likely the time to introduce new era of small hydropower development in Norway. At the moment, there are more 100 of small hydropower projects have been submitted and waiting to get license from NVE. On the other hand, Norwegian government have adopted green certificate subsidy in order to promote the renewable energy production. This green certificate is expected to start operating in January 2012. This thesis work, it focuses on planning and optimization of a small hydropower project in middle region of Norway which is the committed project for development. The main task is to do more detailed studied of all available solution including detailed cost estimated for every item in order to find the optimum design of structure and units. The goal of this thesis is to find the most feasible alternative for project development. Furthermore,the benefit from green certificate subsidy has been included in economic analysis to show the developer of project’s competence to the existing cheap hydropower and other energy sources. The report was divided in two volumes. Volume 1 is screening alternative. Four different alternatives of project had been proposed. Alternative 1 and alternative 4 were recognized as the good alternatives which have been taken to do detailed study in second stage. Volume 2 is the detail study report of selected alternatives. Alternative 1 and alternative 4 have been optimize with many aspects such installed capacity, reservoir volume, tunnel, penstock and the units of generation. After the economic analysis assessment, it was indicated that alternative 1 with 1 unit of generation(alter1-1) is the best. The install capacity was 5.14 MW which can generate 15.5 GWh annually with the optimum design discharge of 7.17 m3/s (Q250% of Qmean). The project was estimated with construction cost of 72.71 million kroner and will give 31.21million kroner as NPV. The development rate was 4.68 Kr/kWh/Year and the levelised unit cost was 0.46Kr/kWh. It is expected that the green certificate subsidy will give between 11.6 and 46.5 million kroner tothe project as additional profit with the subsidy rate between 5 Øre/kWh and 20 Øre/ kWh for 15 years of operation. Based on preliminary assessment of environmental impact, the project is expected to have smalland medium negative impact on fish, recreation, landscape and biodiversity. Overall, the project is technically and economically feasible and environmental manageable. In addition, this project will provide its energy production supply to the middle region of Norway’s grid that recently suffering with the lack of power supply and high electricity price.