In Japan, in addition to the power generation of 21.5 MWe, geothermal energy is used directly at a number of sites. It is used not only in Hokkaido and Tohoku, both cold regions where demand for heat is strong, but also in Kyushu, a mild climate region. This latter region is blessed with thermal springs which are used to increase the yield of agri-and aquaculture products and to make other valuable products by heating