Mini Hydropower Plant for Supporting the Renewable Resources at Madong, Toraja Utara Regency Sulawesi Selatan Province-Indonesia

Abstract

Sulawesi Selatan is one of the provinces with high amount of electricality consumption. By the high amount of electricity consumption, electrical energy is needed to be provided. To provide the electricity we need the energy source. The river in Madong village, Toraja Utara Regency has the characteristic that potentially can be an energy source. To get the benefit from the Madong river, we need the study of designing and economic analysis. From analyzed data of the selected flood discharge (Q100) to be 488.55 m3.s-1 and the selected plant discharge (Q40) to be 13.18 m3.s-1. This hydropower was designed with a concrete and circle-shaped weir. There are the other components such as intake, feeder canal, settling basin, volume, headrace, fore bay and penstock. The penstock is using the welded steel material, with 2 m of diameter and 12 mm of thickness. Then, there is a tailrace that will transmit the water back to the river. The selected turbines are 2 units of Francis type, with the 12.59 MW power produced and 68.92 GWh energy produced in a year. The result of economic analysis, the project is feasible with BCR 1.29, NPV 135 Billion rupiahs, IRR 12.68%, and Payback period within 15.43 years.