Tavip Dwikorianto; Pertamina AG Kamojang, Jawa Barat; Bambang Budiarjo dan YunisPertamina Geothermal Dit. Hulu. As the pioneer in development ofgeothermal industry in hldonesia which was declared on January 29, 1983, Area GeothermalKamojang is one of non nuclear industry that exploited geothermal energy since 1974. Electricalinstall capacity is 140 MW e, divided into Unit 1 of 30 MW e and Unit 2 & 3 which each of them is55 MWe. Good reservoir management program to keep the mass balancing in the reservoir is neededfor supporting of the steam supply to PLTP. One way of it needs the suitable reinjection scenario tomonitor the pattern of injection water and it has ever done with Tritium on 1983 and 1988
