Java-Bali Electricity Supply at Risk Due to Water Hyacinth Covering Saguling Reservoir

The Saguling Reservoir in West Bandung Regency (KBB), West Java, has become a frequent site for the accumulation of large quantities of water hyacinth, forming an ‘island’. If left unchecked, this condition poses a significant threat to the Java-Bali electricity supply produced by the Saguling Hydroelectric Power Plant (PLTA). Senior Manager of PLN Indonesia Power UBP Saguling, Doni Bakar, stated that the presence of water hyacinth still covering parts of the Saguling Reservoir presents a unique challenge to the operational continuity of PLTA Saguling as a renewable energy generator that supports peak loads in the Java-Bali system and regulates system frequency through load frequency control (LFC). “This rapidly growing aquatic plant has the potential to disrupt the water flow that serves as the primary energy source in the electricity generation process. PLTA Saguling relies heavily on optimal conditions in the Saguling Reservoir,” said Doni when contacted on Sunday (19/4/2026). Doni explained that the growth of water hyacinth in the Saguling Reservoir is influenced by a decline in water quality. This situation is inseparable from activities in the upstream areas, particularly the discharge of waste into the Citarum River, which flows into the reservoir. “This triggers massive water hyacinth growth. If not handled sustainably, this condition can lead to a reduction in the reservoir’s volume,” he said. Therefore, his side continues to strive to control the growth of water hyacinth to prevent disruption to the power plant’s performance while preserving the environment. PLN Indonesia Power PLTA Saguling prioritises a collaborative approach involving various stakeholders, from local communities and partner trainees to government agencies and regional authorities.