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Assessment of the Santong River's Consistent Discharge Potential to Meet the Energy Requirements of the Santong Micro Hydro Power Plant in North Lombok Regency

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Abstract:

The plan to harness the Santong River's surface water as a potential source for an independent Micro Hydro Power Plant aims to supply electricity to remote communities (standalone/off-grid) while also linking to the State Electricity Company's distribution network. It is essential to conduct a thorough study and analysis concerning water utilization, focusing on both reliable discharge and the prospective energy output of the Micro Hydro Power Plant, which depends on the water discharge and the electrical energy requirements. This approach ensures that the usage of this water source does not disrupt the downstream water utilization system. The water balance analysis for the Santong Micro Hydro Power Plant takes into account several factors: the reliable discharge at the dam, the water needed for river maintenance (ecosystem flow), potential reliable discharge, water requirements (power demand), and any spillover into the Sidutan River. The Santong Micro Hydro Power Plant has a production capacity of 1000 KW (1 MW), with operational requirements of a maximum of 1.5 m³/sec and a minimum of 0.4 m³/sec. The water balance analysis provides insights into the operational reliability of the plant, covering a total of 324 observation cycles: 264 cycles or 81% indicate ON Operation, while 51 cycles or 16% reflect OFF Operation, and 9 cycles or 3% involve Maintenance. In 2018, a notable decline in operational reliability due to limited reliable discharge was observed at the dam, exacerbated by earthquakes which can alter soil composition and surface flow. This decline was further influenced by signs of a Weak to Moderate El Niño (drought) in that year, as evidenced by discharge data showing 2018 registered the lowest average discharge within the 2015-2023 timeframe.

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Periodical:

Construction Technologies and Architecture (Volume 24)

Pages:

97-105

DOI:

https://doi.org/10.4028/p-I7XL7i

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Online since:

June 2026

Authors:

Restusari Evayanti*, Yunita Aprilina, Dian Lestari

Keywords:

Operational Reliability, Reliable Discharge, Water Balance

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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