Chiyoda Corp. and Sage Geosystems to conduct feasibility study on next-generation geothermal technology

Sage's proprietary EGS approach injects water into an engineered underground reservoir in hot rock and utilises both subsurface heat and the pressure energy stored in the reservoir. Water flows back up from the reservoir, limiting the loss of pressure and water, which strengthens both plant efficiency and project economics. In addition to providing stable, low-carbon baseload power, the approach is being advanced towards long-duration energy storage, using surplus electricity to store pressure energy underground for recovery in response to electricity demand.

Conventional geothermal power generation relies on naturally occurring underground steam or hot-water resources and is generally limited to specific geographic areas. EGS like Sage's apply drilling, well construction, and subsurface reservoir management technologies developed in the oil and gas industry, potentially enabling geothermal resources to be utilised in areas previously considered unsuitable for geothermal development. Unlike solar and wind power, geothermal energy is less affected by weather or the time of day and can provide continuous electricity, making it an attractive source of stable power for data centres, industrial facilities, community microgrids, and critical infrastructure. Sage is developing and commercialising EGS in the US for baseload geothermal power and long-duration energy storage.

Under the study, based on wellhead pressure, temperature conditions, fluid properties and operating conditions provided by Sage, Chiyoda will evaluate the major equipment configuration of the high-pressure surface facilities, power and energy balances, indicative capital, operating costs, and power generation cost.

This initiative has been selected for support under the Tokyo Metropolitan Government's 'TIB CATAPULT' programme, a cluster initiative to drive global innovation promoted by Plug and Play Japan, the TIB cluster representative. The study also aligns with Tokyo's 'Zero Emission Tokyo Strategy' and contributes to decarbonisation. Chiyoda and Sage will continue evaluating the technical and business aspects of deploying next-generation geothermal technology and realising a new source of stable, low-carbon power.

Shayne Dustin, SVP Engineering & Development of Sage Geosystems, said: “Chiyoda's expertise in engineering complex, high-pressure industrial facilities makes it an ideal partner as we move Sage's proprietary EGS approach toward commercial scale. This collaboration is a significant step in proving out the surface infrastructure needed to convert our subsurface innovation into gigawatt scale power generation and long-duration energy storage.”

Ken Kimeta, Head of Business Co-Creation, Assistant Division Director of Business Development & Growth Transformation Division, Chiyoda Corp., added: “Geothermal energy has significant untapped potential, and next-generation technologies like Sage's are key to unlocking it. This collaboration brings together Chiyoda's engineering strength in high-pressure facility design with Sage's subsurface methodologies. Together, we aim to accelerate the path to commercial scale deployment and deliver a dependable, low-carbon power source.”

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Read the article online at: https://www.energyglobal.com/other-renewables/27082026/chiyoda-corp-and-sage-geosystems-to-conduct-feasibility-study-on-next-generation-geothermal-technology/