| Title | Sustainable Energy Development and Water Supply Security in Kamojang Geothermal Field: the Energy-Water Nexus |
|---|---|
| Authors | Yayan SOFYAN, Yunus DAUD, Jun NISHIJIMA, Yasuhiro FUJIMITSU |
| Year | 2019 |
| Conference | Stanford Geothermal Workshop |
| Keywords | Gravity monitoring, Sustainable energy development, Water demand, Energy-Water Nexus |
| Abstract | The Kamojang Geothermal Field (KGF) is a typical vapor dominated hydrothermal system in West Java, Indonesia. From 1983 to 2005, more than 160 million tons of steam have been exploited from the KGF and more than 30 million tons of water were injected into the reservoir system. Between 2009 and 2011, KGF has mass deficiency rate to maintain stable production. Time lapse gravity monitoring can monitor mass balance in the reservoir system. Mass variation in the reservoir of KGF is estimated by this method. According to the calculation and history of production and injection, natural recharge to the KGF’s reservoir is estimated at about 2.77 MT/year from 1999 to 2005 and 2.75 MT/year from 1999 to 2008. Natural recharge, 50% of injected water, cooling system, drilling and other activities in KGF spend large amounts of fresh water. Water consumption for local people is about 0.055 MT/year. The water volume in KGF is between dry season 0.1 MT/month and rainy season 4.6 MT/month. The water demands for sustainable geothermal production of KGF and local people's consumption will increase in the future. Integrated planning between the energy and water sectors in KGF therefore will be essential to meet rising demands for both resources. |