Status of Japanese Supercritical Geothermal project in FY2018

Hiroshi Asanuma, Toru Mogi, Noriyoshi Tsuchiya, Noriaki Watanabe, Shigemi Naganawa, Yasuo Ogawa, Yasuhiro Fujimitsu, Tatsuya Kajiwara, Kazumi Osato, Kuniaki Shimada, Seiki Horimoto, Takashi Sato, Shigeto Yamada, Kimio Watanabe, Yoshiharu Gotoh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Japanese scientists have estimated that nationwide potential of "Supercritical Geothermal Resources", which has an origin in subduction of oceanic plates, reaches hundreds GWs in Japan. Power generation using supercritical geothermal resources (supercritical geothermal power generation) in Japan can significantly contribute to energy security and reduction of emission of CO2. Temperature range of the target supercritical rock body is around 400-500 deg-C and depth is expected to be less than several kilometers. The depth of the supercritical rock body is much shallower than the other area in the world, and it brings advantages in accessibility, economy, and safety. However, there are a lot of scientific unknowns about the nature, especially in rock-mechanical and geo-chemical behavior under supercritical conditions. We also need technological breakthroughs, because temperature and pressure conditions in the supercritical geothermal systems are far beyond the current technological limitations and experiences in the foregoing ultra-high temperature geothermal drillings suggests that presence of acidic geothermal fluid should be expected. Japanese government identified the supercritical geothermal power generation as one of the key technologies in their strategy to drastically reduce emission of CO2 in/after 2050 (NESTI2050). Studies mainly to deepen understanding of nature of the supercritical rock body and engineering investigation have been conducted as NEDO-funded feasibility study until FY2017. In FY2018, NEDO has initiated six 2-3 years national projects related to supercritical geothermal development in addition to on-going METI funded two projects. Outline of the supercritical geothermal projects is described in this paper.

Original languageEnglish
Title of host publicationGeothermal
Subtitle of host publicationGreen Energy for the Long Run - Geothermal Resources Council 2019 Annual Meeting, GRC 2019
PublisherGeothermal Resources Council
Number of pages7
ISBN (Electronic)0934412243, 9781713806141
Publication statusPublished - 2019
EventGeothermal Resources Council 2019 Annual Meeting - Geothermal: Green Energy for the Long Run, GRC 2019 - Palm Springs, United States
Duration: Sept 15 2019Sept 18 2019

Publication series

NameTransactions - Geothermal Resources Council
ISSN (Print)0193-5933


ConferenceGeothermal Resources Council 2019 Annual Meeting - Geothermal: Green Energy for the Long Run, GRC 2019
Country/TerritoryUnited States
CityPalm Springs

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Geophysics


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