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Kyushu Electric Power Co., Inc. generates, transmits, and distributes electricity, and sells electric power and gas to individual and corporate customers. The company utilizes various energy sources, including nuclear, thermal, hydro, geothermal, solar, wind, and biomass, to provide power and energy-related solutions.

Based in Takamatsu, Japan, Shikoku Electric Power Company, Incorporated is a comprehensive utility with domestic and international operations. The company is actively involved in the generation, transmission, distribution, and sale of electricity, utilizing a diverse energy portfolio that includes nuclear, thermal, hydroelectric, solar, wind, and biomass resources. Beyond its core power activities, it provides full-lifecycle services for renewable energy facilities, covering engineering, procurement, construction, operation, and maintenance. Shikoku Electric also extends its services into telecommunications, offering fiber optic internet, data center, and cloud solutions, alongside supplying gas and heat. As of March 31, 2022, its total electric power generating capacity reached 5,280 MW, consisting of 1,153 MW from hydro, 3,235 MW from thermal, 890 MW from nuclear, and 2 MW from solar installations. The company serves a substantial customer base, including 2.295 million residential clients and 266,000 industrial and commercial customers. Founded in 1951, its diversified operations span Electric Power, Telecommunications, Construction and Engineering, Energy, and other business segments.

Tokyo Electric Power Company Holdings, Inc. (TEPCO) operates as a key player in the energy sector, handling the entire process of electric power generation, transmission, distribution, and retail for both domestic Japanese and international markets. The company's robust energy mix features a variety of power plants, including thermal, nuclear, solar, wind, hydroelectric, and geothermal facilities. Beyond its primary electricity services, TEPCO also sells natural gas and offers specialized consulting to other electricity enterprises. Established in Tokyo, Japan, in 1951, the organization was formerly known as Tokyo Electric Power Company, Incorporated, before officially adopting its current corporate identity in April 2016. TEPCO functions as a subsidiary under the Nuclear Damage Compensation and Decommissioning Facilitation Corporation.

The Chugoku Electric Power Co., Inc. engages in generation, transmission, and distribution of electric power in Japan. It generates power through hydroelectric, thermal, nuclear, renewable, and other energy sources. The company provides thermal power, nuclear power, hydroelectric power, transportation facilities, electrical communications, electrical conductors and cables, and other materials and equipment, as well as consulting services. In addition, it owns and operates general hydropower and pumped storage power stations, as well as constructs and operates technology of photovoltaic power plant. Further, the company is involved in natural gas-fired power generation; and coal-fired power generation. The Chugoku Electric Power Co., Inc. was incorporated in 1951 and is based in Hiroshima, Japan.

Hokuriku Electric Power Company supplies electricity through power generation, transmission, and distribution systems in Japan. The company generates electricity through hydroelectric, thermal, and nuclear sources. It is also involved in the sale of LNG; construction of thermal and nuclear power plant equipment; architecture, civil engineering, and paving works; design and construction business; maintenance of hydroelectric power generation substation; distribution facilities; electricity, air conditioning, water supply and drainage, communication equipment construction, and plumbing business; and manufacturing and sale of concrete poles and piles. The company also engages in providing data transmission line and office support work services; development and sale of software, logistics management system, and stem contract; real estate rental and management, temporary staffing, and leasing business; energy solutions, home sales, and gas retail business; execution of environmental greening projects; civil engineering and construction works; administrative services related to administrative indirect operations. In addition, it is involved in investment management business; manufacturing, repair and testing of electricity meters; manufacturing and sales of transformers and switchboards; cable television broadcasting service and internet service; construction and operation of black pellet manufacturing plants. The company was incorporation in 1951 and is headquartered in Toyama, Japan.

Tokyo Energy & Systems Inc., a company founded in Tokyo, Japan, in 1947, specializes in a broad range of services for electrical and mechanical infrastructure within Japan. Its core business spans the entire project lifecycle, from initial planning and detailed studies to design, construction, and supervision. The firm is adept at developing major facilities, including thermal, nuclear, and hydroelectric power plants, chemical and industrial complexes, substations, environmental installations, and residential and commercial buildings. Beyond these primary areas, the company also provides design and construction expertise for civil engineering and architectural ventures, as well as sophisticated telecommunication and electronic systems. Its service portfolio further includes market research focused on product sales-related information, alongside comprehensive maintenance, inspection, repair, modification, demolition, and transportation services for various industrial plants and facilities. Additionally, Tokyo Energy & Systems Inc. is engaged in electricity supply, human resources (worker dispatching), and the acquisition, sale, leasing, and management of real estate. The company was previously known as Tokyo Denki Komusho Co., Ltd. before adopting its current name in April 2001.