Until now, geologists have been divided as to whether this superdeep, superhot resource can be tapped.

Rock under high temperature and pressures - more than 373 degrees Celsius and 220 bars of pressure - is ductile, or gooey, as opposed to a smashable stone from your backyard. 

So far, data shows that rock that fractures at superhot conditions can be ten times more permeable than rock that fractures at conditions closer to the Earth’s surface, and can also deform more readily. 

Scientists have found that in the Taupō Volcanic Zone, supercritical conditions are as shallow as 4 km, making it one of the rare places in the world where supercritical development is both accessible and technically feasible. So far, only Iceland, Japan, the United States and Kenya have successfully drilled superhot wells. 

On today’s Climate Connections, Sheena Thomas, Interim General Manager Research Strategy and Partnership from GNS Science shares her insights on the economic potential and viability of superhot geothermal in New Zealand, and why proper environmental impact studies and collaborations with local indigenous Maori communities are absolutely critical in ensuring minimal environmental impact. She’s also a speaker at the Singapore International Energy Week this year.

GNS Science is leading a multi-year research programme 'Geothermal: The Next Generation’ - to investigate New Zealand’s ‘supercritical’ (high temperature/superhot) geothermal conditions and evaluating the economic opportunity for supercritical geothermal heat and electricity generation in New Zealand.

Feature produced and edited by: Yeo Kai Ting (ykaiting@sph.com.sg)
Voiced by: Audrey Siek
Photo credits: GNS Science
Music credits: pixabay & its talented community of contributors