We have been developing renewable energy sources by leveraging our long-accumulated expertise and knowledge in underground resources. To date, we have been promoting the creation of renewable energy sources, mainly geothermal and hydroelectric power generation, in order to provide a stable supply of energy with minimal environmental impact, utilizing the expertise we have accumulated.

We generate stable and clean electric power through the power plants we maintain, including the Onuma Geothermal Plant and Sumikawa Geothermal Power Station (steam supply only, power generated by Tohoku Sustainable & Renewable Energy Co. Inc.), both in the Hachimantai area of Kazuno, Akita prefecture, and the Wasabizawa Geothermal Power Plant in the Takamatsu and Akinomiya areas of Yuzawa, Akita Prefecture and the Appi Geothermal Power Plant in Hachimantai, Iwate Prefecture (both joint ventures by Mitsubishi Materials Corporation, Electric Power Development Co., Ltd., and Mitsubishi Gas Chemical Company, Inc.). In the fiscal year ended March 2026, we generated a total of 596 GWh of power by geothermal power plants (including 329 GWh from plants in which we have equity stake, etc.). The operation of our geothermal plants and steam supply systems effectively reduced CO_² emissions by approx. 132,000 tons (calculated based on emissions from Sumikawa Geothermal Power Station of Tohoku Sustainable & Renewable Energy Co. Inc., our equity stake in Wasabizawa Geothermal Power Plant of Yuzawa Geothermal Power Corporation, and our equity stake in Appi Geothermal Power Plant of Appi Geothermal Energy Corporation).
In geothermal power generation, it is important to understand the unseen underground conditions to ensure a continuous and stable supply of steam. We will continue to monitor the underground conditions through detailed verification of data since the start of operation and reanalysis of the geological structure in order to improve the amount of electricity generated and continue stable operations at the site.

In addition to the geothermal power plants described above, we are also pursuing new geothermal development projects. We launched a survey to quantify the geothermal resources in the Komonomori area (Kazuno City, Akita Prefecture) in 2021, followed by a survey in the upstream area of the Appi River (Hachimantai City, Iwate Prefecture) in 2022. In addition, we commenced a geothermal resource survey in the Southern Shikabe Area (Kayabe District, Hokkaido) in 2025. We will continue advancing new geothermal development projects with the support of the Japan Organization for Metals and Energy Security(JOGMEC).

Appi Geothermal Energy Corporation, which is a joint venture company formed by Mitsubishi Materials Corporation, Mitsubishi Gas Chemical Company Inc., and Electric Power Development Co., Ltd., started commercial operation of the Appi Geothermal Power Plant.
The Appi Geothermal Power Plant is located at an altitude of approximately 1,130 meters and operates at an output capacity of 14,900 kW utilizing promising geothermal resources in the Hachimantai region of Iwate Prefecture. This was the first time in 28 years that a geothermal power plant with an output of over 10,000 kW has operated in Iwate Prefecture. All the electricity generated will be supplied to society under the Feed-In Tariff (FIT) system for renewable energy.

This project is supported by JOGMEC through its debt guarantee program for geothermal resource development funding.
We will contribute to the expansion of the use of renewable energy through the stable operation of the Appi Geothermal Power Plant.

In 2000, Mitsubishi Materials Techno Corporation entered the business of ground-source heat, which is heat from a renewable energy source, as a provider of total engineering solutions. The company has been providing services in the process from project proposal through investigation, design, and construction. 
The company has continued its R&D efforts and acquired patented technologies through projects commissioned by the government and others, aiming to become the No.1 company in ground-source heat technologies. As a result, the company has succeeded in building infrastructure using ground-source heat by developing commercial systems with various heat exchange methods, including not only the common borehole method but also its patented foundation pile method as well as horizontal and earth retaining wall methods. At present, Mitsubishi Materials Techno Corporation is promoting sales of these technologies as systems for using ground-source heat utilized through urban infrastructure, aiming to contribute to urban development in the future. 
Approx. 140 systems from the company have been installed. Since 2020, the large-scale utilization of ground-source heat has been increasing. For example, the company completed one of the largest projects in Japan, which combines the borehole method (100 m in depth x 120 boreholes) and the horizontal method (nine units x approx. 100 m long trenches), at a city hospital in Hachimantai. It also completed one of the largest projects in the Tokyo metropolitan area, which applied the foundation pile method (66 cast-in-place piles) at the Yokohama City Hall. In May 2022, Mitsubishi Materials Techno Corporation, the Yokohama City Government, Takenaka Corporation, and other companies received the 60th Gakkai-sho Gijutsu-sho (academic society award and technology award) in the building equipment category from the Society of Heating, Air-Conditioning and Sanitary Engineers of Japan for the implementation of the Yokohama City Hall environmental and facility plans. In addition, the ground source heat pump system using urban infrastructure also won the New Energy Award 2024 (Minister of Economy, Trade and Industry Award) in January 2025. 
The company will continue to help establish a decarbonized society by expanding the use of ground-source heat as renewable energy. 

CCS is a technology that separates and captures CO₂ emissions from industrial facilities such as factories and power plants, and injects them into stable deep underground geological formations for long-term storage. The captured CO₂ is transported to storage sites via pipelines, ships, or other means and is safely contained within subsurface reservoirs. By preventing CO₂ from being released into the atmosphere, CCS complements the decarbonization of industrial sectors where emissions are difficult to reduce through renewable energy and energy efficiency measures alone. After injection, the condition of the stored CO₂ and the surrounding environment are continuously monitored to verify safety. CCS is an important technology that supports both industrial activity and a stable energy supply while reducing environmental impact, thereby contributing to the achievement of carbon neutrality.