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IMPACT OF CLIMATE CHANGE ON THREE LARGE RESERVOIRS OPERATION IN CITARUM RIVER – INDONESIA Hari SUPRAYOGI Director of River and Coastal, MINISTRY OF PUBLIC WORK AND HOUSING, INDONESIA Harry M. SUNGGUH Director II, JASA TIRTA II PUBLIC CORPORATION, INDONESIA Reni MAYASARI Special Expertise Level I of Water Resources Management, JASA TIRTA II PUBLIC CORPORATION, INDONESIA 1. INTRODUCTION Citarum River with a length of ± 270 km has an upstream area that is mostly located in Bandung regency and partly in Garut regency. Citarum River flows from the south then moves towards the West which then turns to the North with the largest estuary in Muara Bendera - Java Sea. The Citarum River area which is the working area of Jasa Tirta II Public Corporation consists not only of the Citarum River basin, but is a unified hydrological system that combines the Citarum River and its surrounding rivers, the result of water resources development based on the thought of Blommestein (1949). On the Citarum River there are three stair-shaped reservoirs (cascade) with a classification of large dams, namely Saguling, Cirata, and Jatiluhur. These three reservoirs are managed by different institutions, namely Saguling by Saguling Power Generating Unit (UBP) under PT Indonesia Power, Cirata by UBP Cirata under PT PJB where PT Indonesia Power and PT PJB is a subsidiary of PT PLN (Persero) while Jatiluhur is in the management of Public Company (Perum) Jasa Tirta II (PJT-II) under the management control of State Minister of State-Owned Enterprises with related technical department is Ministry of Public Works. The water resources in the Citarum river is the main source of raw water supply other than the surrounding rivers that are integrated in the Jatiluhur infrastructure system for various purposes, including the need for raw water for drinking water of DKI Jakarta and the district / municipal water supply companies, raw water for industry, irrigation area of 240,000 ha, flood control, hydroelectricity and others. The Citarum cascade reservoir has an installed generation capacity of ± 2000 MW with an annual production of ± 3.7 TWh (3.7 x 109 kWh). Climate change is already a fact. The doubling of CO2 emissions (ppm) compared with the Industrial Revolution in the 19th century is defined as a half degree of world temperature rise. This will lead to an increase in half the degree 466