The Application of Energy Simulation Modeling to Decarbonize Buildings: Case Study from Sudan. Rania A. Osman 1 1 Assistant Professors, Oman College of Management and Technology, Sultanate of Oman, Rania.Basheer@omancollege.edu.om, +96892406460 Abstract. To limit global warming by 2 °C by 2050, carbon dioxide emissions in buildings would need to be reduced by 77%, according to projections. Energy consumption in buildings is one of the main sources of greenhouse gas emissions. Decarbonizing the energy demand of build- ings involves two approaches: first, reductions in energy demand, and second, a reduction in the carbon content of energy by shifting to clean renewable energy sources. Some countries that account for a large share of global CO2 emissions have started energy efficiency initiatives. Nev- ertheless, same effort is not performed by Arab countries. Of the 163 member countries of UN, listed in the 2022 Sustainable Development Report, only four countries score more than 69 points (Algeria, Tunisia, Jordan, and Oman), and Somalia ranks last with 45.6 points. Arab countries need to do more to link existing climate targets with realistic, enforceable measures. This research proposes a framework that promotes the use of energy simulation models to ensure the optimi- zation of retrofit initiatives to reduce energy consumption in buildings. The objective is to present numerical forecasts of energy demand after renovation. Extensive field measurements have been conducted and used as input data for the building energy simulation program. The proposed ren- ovation project has resulted in a 38% reduction in energy consumption, in addition to 41% of the total energy consumption met by solar energy. Keywords: Simulation; energy efficiency; energy codes, Retrofit, decarburization. 1 Introduction The pandemic has taught us that national solutions to global problems does not work, and the statement think global and act local has been used in various contexts but the real gap between SDGs and the local plans to mitigate climate change is increasing day by day. The building sector alone accounts for 38% of global energy related carbon dioxide emissions (UNEP, 2020) thus countries need to set plans to achieve a measur- able impact in mitigating climate change. These plans need to consider planning for a real modification of each building unit to be able to achieve the 77% reduction in carbon dioxide to limit the global warming by 2 °C by 2050. This research analyzes the progressive effort done by Arab countries to achieve SDGs according to UN SDG index and dashboard. A literature review is included to give an overview of the building energy codes and energy simulation importance for best de- carburization expected result. A survey was conducted to evaluate the use of simulation process to decarbonize buildings in Arab countries. Then a case study is presented to