| Abstract |
Geothermal power is extracted from heat stored in the earth. This geothermal energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface. This paper discusses the use of geothermal energy in our electrical power systems and potential development in Central Java. Geothermal power plant is very compatible built in Gedongsongo. Gedongsongo surface manifestations of the Ungaran geothermal prospect in Central Java, Indonesia, have high temperature properties, 72 - 870C, 2 – 6 pH and 770 ppm of chloride. The stable isotopic ratios of ä18O and äD of two adjacent manifestations show a slightly different enrichment. The western part reveals a more magmatic water influence than those of the eastern one. This is supported by the presence of relic manifestations as most occurs in the eastern part; whereas active fumaroles and steaming ground exist at western part. At present, the scale of geothermal power industry is small because of the limitation of easily exploitable high temperature geothermal resources, therefore, the development of geothermal resources have to be primarily focused on utilization of ground source heat pumps which can make good use of the enormous low temperature geothermal resources. geothermal energy would still have strong competition, if the utilization efficiency and cost could be made great progress. In view of the future development trends, geothermal energy will remain a higher growth rate than that of fossil energy for a long time, and the proportion in energy consumption will further increase, but it would not be of reality looking forward to alternate fossil energy in large scale. |