Editing Spring (hydrology) (section)

====Geothermal energy====
Hot springs have been used as a heat source for thousands of years. In the 20th century, they became a renewable resource of geothermal energy for heating homes and buildings.<ref name="ARD" /> The city of [[Beppu|Beppu, Japan]] contains 2,217 hot spring well heads that provide the city with hot water.<ref name="CSM">{{cite news |last1=Holtz |first1=Michael |title=Japan builds a head of steam for an alternative to nuclear |url=https://www.csmonitor.com/World/Asia-Pacific/2018/0309/Japan-builds-a-head-of-steam-for-an-alternative-to-nuclear |access-date=17 November 2021 |publisher=Christian Science Monitor |date=9 March 2018}}</ref> Hot springs have also been used as a source of sustainable energy for greenhouse cultivation and the growing of crops and flowers.<ref name="sustain energy">{{cite web |title=Case Studies in Hot Spring Use for Sustainable Energy |url=https://www.pref.oita.jp/uploaded/attachment/2049215.pdf |publisher=Oita Prefectural Government |access-date=17 November 2021}}</ref>