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Royal Institute of Technology Stockholm (KTH) 2017

Exploring the water-energy nexus in the Omo river basin : A first step toward the development of an integrated hydrological-OSeMOSYS energy model

Sundin, Caroline

Titre : Exploring the water-energy nexus in the Omo river basin : A first step toward the development of an integrated hydrological-OSeMOSYS energy model

Auteur : Sundin, Caroline

Université de soutenance : Royal Institute of Technology Stockholm (KTH)

Grade : Master - Environmental Engineering and Sustainable Infrastructure 2017

Résumé partiel
The issues of conflicts between water, energy and food (often referred to as WEFnexus) has become a problem in countries where the energy system is rapidly expanding ; one of those countries is Ethiopia. Ethiopia has a large potential of hydropower, which is what most of the electricity production currently comes from. However, this has proven to cause problems on other practices around or close to the power plants. An example is the Omo River basin where the development of the Gibe hydropower cascading scheme, with currently the three power plants Gibe I, I and III operating, have brought up the discussion of the downstream impact. For instance, indigenous people living in the lower parts of Omo river, practice flood recession agriculture, meaning they are depending on the seasonal floods. Further, Omo river has its outflow into Lake Turkana, Kenya, and the lake is highly dependent on the flow regime of the Omo river. Studies on the Omo river have been many, an example is the ones using Topkapi-ETH, a physically based rain-fall runoff model, that models the hydrological aspects of the river and considers, among others, water abstraction for irrigation and diversions to reservoirs for hydropower. However, the hydropower modelled worked on the basis of an averaged power demand ; not necessarily reflect the actual demand. Hence, OSeMOSYS, the long-term energy optimization tool, was proposed to complement this study by modelling the energy system in Ethiopia. This current thesis had the aim to do so with the attempt to explore the possibility of a coupling between the models Topkapi-ETH and OSeMOSYS. The aim was to feed OSeMOSYS with varying water availability from Topkapi-ETH ; in return, OSeMOSYS would feed Topkapi-ETH with a more realistic required energy production demand. An OSeMOSYS model was set up for Ethiopia, with national data extracted from the study The Electricity Model Base for Africa (TEMBA), disaggregating the hydropower to be able to model each of the hydropower plants in the Gibe cascading scheme individually. To couple the two models, two approaches were developed : Storage module and Reservoir module

Mots Clés  : Water-Energy nexus, Topkapi-ETH, OSeMOSYS, Coupling of models, Omo river basin

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