Journal of Energy and Natural Resources 2018; 7(2): 54-59 http://www.sciencepublishinggroup.com/j/jenr doi: 10.11648/j.jenr.20180702.11 ISSN: 2330-7366 (Print); ISSN: 2330-7404 (Online) Estimation of Greenhouse Gas Emissions and Mitigation Methods in Electrical Power Sector of Dire Dawa City from 2015 to 2025 Solomon Derbie Gont * , Mikias Hailu Kebede Electrical and Computer Engineering Department, Debre Berhan University, Debre Berhan, Ethiopia Email address: * Corresponding author To cite this article: Solomon Derbie Gont, Mikias Hailu Kebede. Estimation of Greenhouse Gas Emissions and Mitigation Methods in Electrical Power Sector of Dire Dawa City from 2015 to 2025. Journal of Energy and Natural Resources. Vol. 7, No. 2, 2018, pp. 54-59. doi: 10.11648/j.jenr.20180702.11 Received: May 21, 2018; Accepted: June 7, 2018; Published: June 29, 2018 Abstract: This manuscript reviews and compares the results of recent greenhouse gas (GHG) emission life-cycle analyses. Specific attention is paid to fossil energy technologies and renewable energy technologies (RETs). It is therefore desirable for GHG emissions under national, regional and international mitigation policies to be accounted for over its entire life-cycle. The results presented here indicate that the most significant GHG avoidance (in absolute terms) can be made from technology substitution. The introduction of advanced fossil fuel technologies can also lead to improvements in life-cycle GHG emissions. Overall, hydro, nuclear, solar and wind energy technologies can produce electricity with the least life-cycle global warming impact. The advantage of using renewable resources for energy production from conventional resources scarcity and power system reliability point of view is too much. Using renewable resources specially wind and solar are becoming common in developing countries for electrifying the remote and rural areas where grid electrification is economically infeasible. This research work shows an investigation that uses a combination of solar and wind energy as hybrid system (HPS) for electrical generation in Dire Dawa. The generated electricity has been utilized for different purposes. The system has also integrated a diesel generator to be more reliable. This system is not linked with conventional energy. The total energy consumption of each household is 29.44 kWh/day. Measurements included the solar radiation intensity, the ambient temperature and the wind speed was collected from national meteorology agency which was collected for 15 years. To simulate the hybrid power system (HPS) HOMER was used. Emissions and renewable energy generation fraction (RF) of total energy consumption are calculated as the main environmental indicator. The net present cost (NPC) and cost of energy (COE) are calculated for economic evaluation. It is found that, for Dire Dawa climates, the optimum results of HPS show a 93.73% reduction of emissions with 99% of renewable energy fraction. Keywords: Greenhouse Gas, Renewable Energy, Dire Dawa, Hybrid Power System, HOMER 1. Introduction Nowadays, the mankind is living in facing energy crisis. The most optimist forecasts reveal the fact that the main classic energy resources (oil and natural gas) will be exhausted until 2050. Also, the combustion causes the greenhouse effect which will determine an apocalyptical scenario in the next (80-100) years. In this scenario, the only solution is finding and using new energy resources, inexhaustible and clean, which will substitute in the next 50 years the current conventional resources (fossil fuels). The growing share of renewable energy production is predictable but depends both on reducing the production costs and on finding new electrical energy storage solutions. This will ensure the injection into the power system of large quantities of renewable energy. Even more, the legislation regarding environment protection imposes the usage of this kind of energy. In March 2007, a European agreement was signed, which impose the reduction of CO 2 emission with 20% until 2020 and 50% until 2050, but also using the bio fuels with a share of 10% [5]. There are no reasons to doubt that in the future our