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Hybrid Renewable Energy System is a very good solution to the energy deficit encounter in developing countries. The paper presents the optimal design of a hybrid renewable energy system regarding the technical aspect that is Loss of Power Supply Probability (LPSP), economic aspect that is Cost of Electricity (COE) and Net Present Cost (NPC) and environmental aspect that is Total Greenhouse gases emission (TGE) aspects using a multi-objective Particle Swarm Optimization algorithm for a Community multimedia center in MAKENENE, Cameroon. Optimal configurations including Photovoltaic (PV), Wind, Battery and Diesel generator (DG), separated into Scenarios 1–7 of hybrid energy systems are tested to have the most appropriate Scenario. Scenario 3 (Hybrid system with PV, Battery and DG) with Loss of Power Supply Probability, Cost of Electricity, Net Present Cost and Emission of 0.003%, 0.132 $/kWh, 38,817.7 $ and 2.2 kg/year respectively is found to be the most appropriate for the Community multimedia center.

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In this paper, we present an analysis of energy and exergy utilization in the residential sector of Cameroon by considering the sectoral energy and exergy flows for the years of 2001-2010. Exergy analysis of Cameroon residential sector utilisation indicates a less efficient picture than that obtained by the energy analysis. Cooking stands out as the most inefficient end use in the Cameroon's residential sector. In 2010, the energy and exergy efficiency are determined and were respectively 58.74% and 22.63%. Energy and exergy flows diagrams for the overall efficiencies of Cameroon residential sector are illustrated and a comparison with the residential sector of other countries is also done. To carry out this study, a survey of 250 households was conducted and the sharing of the end uses of energy was done and data were gathered.

Addressing the rapid growth in global energy demand and electricity access deficits requires that energy be produced and used in a sustainable way so as to achieve sustainable energy for all. In 2016, studies showed that about 17% of the world population (1.2 billion people) mostly in Asia-Pacific and sub-Saharan Africa still do not have access to electricity; even with an increase in power generation using renewable energy sources. [1,2] This is mainly due to the fact that most of this people live in remote areas where it is very difficult to access the regional grid.In Cameroon, the global access to electricity was 62% with a 94% in urban areas and 35% in rural areas. [3] This is mainly due to the fact that most electricity produced is used to satisfy electricity demand of urban areas. Even with this high access rate to electricity in urban areas, many households in these areas do not have access to electricity. Table 1 shows the number of households without electricity and their respective percentages in the ten regions of the country. Figure 1 shows the sectorial electricity consumption in 2014 in Cameroon; it is clearly seen that the residential sector occupies a nonnegligible percentage (20.7%) in electricity.Cameroon has two main climatic types, the equatorial and the tropical, which are divided into the following subtypes [4] (Figure 2): 1) Equatorial Guinea: it covers about one-third of Cameroon and is found in the southern part of the country. It limits to the southern part of the Adamawa region. It is characterized by rainfall all year round and the annual rainfall ranges from 1500 to 2000 mm. The average annual temperatures are about 25 C. 2) Equatorial monsoon (Equatorial Cameroon): it extends from the coast around Kribi and covers part of the western high plateau. The annual rainfall ranges from 2000 to 10 000 mm. The average annual temperatures range from 21 to 25 C. 3) Tropical humid (Tropical Sudan): it covers the North and Adamawa regions. Rainfall is spread over about 4 or 5 months only, while the other months are dry. 4) Sudano-Sahelian (Tropical Sudano-Sahelian): it extends from Maroua to the Lake Chad basin. It is characterized by a short rainy season and a marked dry season. Here, the rainfall amounts range from 900 mm around Maroua to 500 mm around Kousseri, and 400 mm around the shores of Lake Chad. The mean annual temperatures are similar to those of the Sudan type (28 C).In Cameroon, residential buildings are classified into six different categories based on the minimal area and the components of the building called T1, T2, T3, T4, T5, and T6. [5] Of these six

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