Electrical energy is getting more important in our daily life. With the coming development of the Sarawak Corridor of Renewable Energy (SCORE), hydropower plant is getting more interesting to face the demand on the domestic usage. Electrical energy can be used to carry out our daily routine. Small hydropower been very adaptive solution for rural area. Hence, this paper shows the estimation of energy efficiency for hydropower generator for Belawai river located at Sarawak. Excess rainfall

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... aph and direct runoff hydrograph been use to evaluate efficiency of the power generation based on river flow. Result show river flow strength depend on the rainfall which is about 38.56% of efficiency and other environmental factors which will affect the efficiency of the converter