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Interrupted power supply and poor access to electricity (15%) have been persistent problems in Malawi for decades. Diversification of resources is required to solve the challenges. Therefore, this study is aimed at conducting a techno-economic analysis of a hybrid system to ensure electricity reliability, bill reduction, and reduced grid demand at a school. The study investigated six hybrid system scenarios that had various combinations of the grid, diesel, solar PV, wind, biogas, and battery. The HOMER Pro model was used to determine the best system combination. Six scenarios were examined further using the CRITIC-PROMETHEE II approaches. The best system configuration included grid, solar PV, and biogas electricity. Biogas generation is mainly from human excreta. The study also investigated the effect of the 2022 inflation rate on the financial performance of the system, which had shown a sharp increase in capital, replacement, O&M costs, and payback time. The proposed system’s levelized cost of electricity is 0. 095 /kWh, which is less than Malawi’s grid’s levelized cost of 0. 11 /kWh. Environmentally, the system could help to reduce greenhouse emissions, including those from the sewage system. Therefore, schools and governments should invest in alternative energy generation.
Chisale et al. (Wed,) studied this question.