(as of July 31, 2017)
Business field
| Name of company | Capital (Millions of yen) | Investment ratio (%) | Date of establishment | Principal businesses |
| The Nihonkai Power Generating Company, Inc. | 7,350 | 100.0 | Apr.15, 1982 | Wholesale supply of electricity |
| Kurobegawa Denryoku | 3,000 | 50.0 | Oct.20,1923 | Wholesale supply of electricity |
| Toyama Kyodo Jikahatsuden Co., Ltd. | 1,350 | 50.0 | Apr.28, 1952 | Small-scale electrical power generation |
| Hokuriku Lnes Co., Ltd. | 200 | 75.0 | Aug.31, 2001 | Sale of LNG |
| Hokuden Partner Service Inc. | 20 | 100.0 | Jul.2, 1990 | Maintenance of electrical power equipment and operation of electrical and related facilities |
| Name of company | Capital (Millions of yen) | Investment ratio (%) | Date of establishment | Principal businesses |
| Hokuriku Plant Services Co., Ltd. | 95 | 100.0 | Apr.1, 1970 | Construction of thermal and nuclear power plant equipment |
| Hokuden Techno Service | 50 | 100.0 | Apr.1, 1982 | Maintenance of hydroelectric power plant and transformer equipment |
| Nihonkaikenko Corporation | 200 | 48.0 | Mar.23, 1946 | Design and execution of civil engineering and construction projects |
| HOKURIKU ELECTRICAL CONSTRUCTION Co., LTD. | 3,328 | 46.8 | Oct.1, 1944 | Electrical work |
| Hokuden Engineering Consultants Co., Ltd. | 50 | 100.0 | Jul.1, 2001 | Research, design, and administration of civil engineering and construction projects |
| Hokuriku Electric Power Biz Energy Solutions Co., Ltd. | 110 | 100.0 | Mar.1, 2017 | Energy solution business |
| Name of company | Capital (Millions of yen) | Investment ratio (%) | Date of establishment | Principal businesses |
| Hokuriku Telecommunication Network Co., Inc. | 6,000 | 100.0 | May 25, 1993 | Wide-area Ethernet service and corporate Internet connectivity |
| Hokuden Information System Service Company, Inc. | 50 | 100.0 | Apr.1, 1987 | Software development and maintenance |
| Power and IT Company | 495 | 53.5 | Aug.11, 2009 | Data center operations |
| Name of company | Capital (Millions of yen) | Investment ratio (%) | Date of establishment | Principal businesses |
| Nihonkai Environmental Service Inc. | 50 | 100.0 | Jan.10, 1992 | Environmental research; design and execution of environmental greening projects |
| Japan Ecology and Security Service Company | 50 | 51.0 | Jun.1, 2000 | Recycling and storage of confidential documents and archives; sale of paper products |
| Name of company | Capital (Millions of yen) | Investment ratio (%) | Date of establishment | Principal businesses |
| Hokuden Sangyo Co., Ltd. | 100 | 100.0 | Jun.1, 1974 | Real estate leasing and management, temporary staffing, equipment leasing, operation of the Hyakusen Yokocho online store, and nursing care/ social welfare services |
| Hokuriku Electric Power Living Service Co., Ltd. | 50 | 100.0 | Jul.1, 1987 | Consulting to promote comfortable, energy-efficient lifestyles |
| Hokuriku Denki Shoji Co., Ltd. | 10 | 60.0 | Nov.8, 1949 | Telephone pole advertising and travel services |
| Name of company | Capital (Millions of yen) | Investment ratio (%) | Date of establishment | Principal businesses |
| Nihonkai Concrete Industries Co. | 150 | 80.0 | Feb.4, 1953 | Manufacture and sale of concrete poles and piles |
| Hokuriku Instrumentation Co., Inc. | 30 | 40.0 | Sep.1, 1970 | Manufacture, repair, and testing of power meters and other instrumentation |
| Hokuriku Energys Co., Ltd. | 48 | 25.0 | Apr.3, 1981 | Manufacture and sale of distribution switches and other equipment |
| Hokuriku Electric Co., Ltd. | 200 | 19.8 | May 17, 1944 |