TOYO Advances Next-Generation Geothermal Power with Coaxial Closed-Loop Technology in Japan

TOYO Selected for Feasibility Study on Coaxial Closed-Loop Geothermal Technology in Japan

Toyo Engineering advances next-generation geothermal power solutions with JOGMEC approval

October 27, 2025

Toyo Engineering Corporation (TOYO) has been officially selected by the Japan Organization for Metals and Energy Security (JOGMEC) to conduct a feasibility study under the "Next-Generation Geothermal Power Generation Technology" program. TOYO’s proposal, titled “Feasibility Study on Coaxial Closed-Loop Geothermal Power Generation Technology in Japan”, has been approved for commissioning, marking a major step toward the domestic implementation of next-generation geothermal systems.

Unlike conventional geothermal power, which relies on groundwater or natural geothermal reservoirs, the coaxial closed-loop system can generate electricity wherever heat sources exist, across a variety of geological conditions. The system works by circulating a heat transfer fluid, such as water, through an underground coaxial double-pipe structure. The fluid absorbs geothermal heat and returns to the surface, where the heat is converted into electricity—offering a sustainable, efficient, and flexible approach to geothermal power.

To accelerate the development of this technology, TOYO has signed a collaboration agreement with U.S.-based GreenFire Energy Inc. (GFE). Together, the two companies will explore the applicability of GFE’s Advanced Geothermal Systems (AGS) coaxial closed-loop technology in Japan. This partnership aims to maximize the use of Japan’s geothermal resources and contribute to the country’s clean energy transition and carbon-neutral goals.

About TOYO

Founded in 1961, TOYO Engineering is a global engineering company providing plant construction and engineering services in over 60 countries. Starting from chemical fertilizer technologies, TOYO has expanded into petrochemicals, oil and gas, resource development, and power generation. With a mission to contribute to a sustainable society through engineering, TOYO continues to introduce environmentally friendly solutions and cutting-edge technologies to support decarbonization.

Source: Toyo Engineering

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