The Daifunto thermal area, known as the Great Onsen Fountain, near Yuzawa City in northern Japan. Responding to safety concerns in the wake of the Fukushima Daiichi nuclear disaster, the Japanese government recently said it would aim to triple renewable energy sources, including geothermal
But Mr. Ito’s heritage may be under threat. The white steam, rising lazily from the thermal springs, has attracted developers with plans for a geothermal power plant in the Kurikoma Kokutei Koen, a mountainous area behind his inn that is a national monument.