抄録
Los Alamos National Laboratory conceived the idea of the development of Hot Dry Rock geothermal energy in 1970 and they got hot water of about 150°C from a depth of around 2600 m in 1977 and 1978. This result demonstrates the technical feasibilities of HDR system so that they are constructing deeper and hotter heat-extraction loop called Phase II system to demonstrate the economic feasibilites. Japan and West Germany have participated in this program under the IEA agreement. This report outlines the activity and the problem to create Phase II system including hydraulic fracturing.
