NEDO (New Energy and Industrial Technology Development Organization) researches development of hot dry rock (HDR). In order to verify the heat extraction capacity of dual artificial reservoirs of HDR, a long-term heat extraction experiment was started on November 27, 2000. In the first year of the test, only a single reservoir was used for circulation. The test was successfully continued for over 330 days as at November 15, 2001. Max. thermal output was 9.3 MWt when recovery was over 60%. These figures had decreased to 3.6 MWt and 39%, respectively, by December 10 2001. Thermal output and surveyed temperature profile data provided clear thermal draw down of the production zones in HDR-2a. In the second year, dual reservoir circulation and a power generation test is scheduled. The model of the Hijiori system can be reevaluated with these data and will be used in the verification.

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