About Us

ISHI Energy is a technology start-up built on extensive experience from geothermal research and industrial energy projects. Our ambition is to develop smart geological energy storage systems based on simple, robust, and elegant physical principles. Through a combination of scientific expertise, engineering, and strategic partnerships, we work toward more sustainable and locally produced energy solutions.

We believe future energy systems must be flexible, efficient, and adapted to local geological conditions. Our team is dedicated to transforming subsurface resources into reliable thermal energy storage that supports the green transition.

Please contact us if you would like to learn more about how our energy storage solutions can be applied in your specific setting. We are always open for discussions, collaborations, and new opportunities.

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Background

Our technology is based on FTES (Fracture Thermal Energy Storage), where the storage fluid circulates through natural rock fractures rather than conventional borehole heat exchanger systems. This approach enables efficient thermal exchange in naturally fractured bedrock formations while reducing drilling complexity and improving scalability.

Our proprietary iCirc technology builds further on these principles by optimizing circulation, thermal recovery, and long-term storage performance in fractured geological environments.

Several scientific studies and field investigations have demonstrated the advantages of fracture-based thermal storage systems compared with traditional borehole-based solutions, particularly in terms of thermal efficiency, storage capacity, and geological adaptability. Selected publications and research references illustrating these advantages can be provided upon request

Seasonal storage