Steam rises from outdoor pools overlooking a waterfall at a 90-year-old hotel in Fukushima Prefecture¡¯s Tsuchiyu Onsen.

¡°What has saved us since the disaster are the loyal regular guests and the new visitors who have come to study our town¡¯s renewable energy plant. Without them, I¡¯m sure we would have had to close,¡± says Izumi Watanabe, who has been director of Sansuiso Tsuchiyu Spa for 37 years.

¡°People come from other onsen areas all over Japan to learn how they can become energy independent and how the binary plant we have doesn¡¯t affect our hot springs,¡± she says, challenging the preconception that onsen communities, fearing a negative impact on their tourism business, typically hold back the development of geothermal energy in Japan.