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Due to the depletion of fossil fuel reserves, it is feared that the world will run out of its energy resources soon. Besides, unpredictable fluctuation of diesel prices in electricity generation is affecting the economy of a country. Thus, for developing country that's economically leans on the use of energy, renewable energy resources should be utilized to meet the increasing energy demand. In this regards, the cogeneration system using renewable energy sources is appropriate, because it has the advantage of producing both electrical power and heat energy from a single fuel. It is suitable for commercial clients like hospital buildings which requires to supply both electric and heat load. Therefore, the aim of this study is to assess the viability to develop a cogeneration system for a hospital building load in Malaysia. The proposed cogeneration system consists of grid connected photovoltaic (PV), fuel cell, and battery. Hybrid …