Member Companies[Electric Power]
1 Hokkaido Electric Power Co., Inc.
2 Tohoku Electric power Co., Inc.
3 Tokyo Electric Power Company Holdings, Inc.
4 Chubu Electric Power Co., Inc.
5 Hokuriku Electric Power Co., Inc.
6 The Kansai Electric Power Co., Inc.
7 Chugoku Electric Power Co., Inc.
8 Shikoku Electric Power Co., Inc
9 Kyushu Electric Power Co., Inc.
10 The Okinawa Electric Power Co., Inc.
11 Electric Power Development Co., Ltd.
12 The Japan Atomic Power Co., Ltd.
13 Kashima Kyodo Electric Power Co., Ltd.
14 Kimitsu Cooperative Thermal Power Company, Inc.
15 Kurobegawa Electric Power Co., Ltd.
16 Jyoban Joint Power Co., Ltd.
17 Soma Kyodo Power Co., Ltd.
18 JERA Co., Inc
19 Japan Electric Power Information Center, Inc.
20 Thermal and Nuclear Power Engineering Society
21 The Federation of Electric Power Companies
22 Central Research Institute of Electric Power Industry
23 Japan Electric Association[Gas]
24 Osaka Gas Co., Ltd.
25 Tokyo Gas Co., Ltd.
26 Toho Gas Co., Ltd.
27 Japan LP Gas Association
28 The Japan Gas Association[Oil]
29 INPEX Corporation
30 ENEOS Power Corporation
31 Japan Energy Resources Development Association
32 Petroleum Association of Japan[Coal]
33 JAPAN CARBON FRONTIER ORGANIZATION[Nuclear Power]
34 Japan Atomic Industrial Forum Inc.
[Electric Machinery/Prime Mover]
35 IHI Corporation36 MR Japan Corporation
37 General Electric Global Services GmbH
38 TAKAOKA TOKO CO., LTD
39 Toshiba Energy Systems & Solutions Corporation
40 NGK Insulators, Ltd.
41 Hitachi, Ltd.
42 Fuji Electric Co., Ltd.
43 Mitsubishi Heavy Industries, Ltd.
44 Mitsubishi Electric Corporation
45 Meidensha Electric Manufacturing Co., Ltd.

[Electric Machinery/Prime Mover]46 Yasukawa Electric Manufacturing Co., Ltd.
47 Yokogawa Solution Service Corporation
48 DAIHEN Corporation
49 The Japan Electrical Manufacturers’ Association[Iron & Metals]
50 Kobe Steel, Ltd.
51 NIPPON STEEL CORPORATION
52 JFE Steel Corporation
53 The Japan Iron and Steel Federation[Electric Wire]
54 SWCC Corporation
55 Sumitomo Electric Industries, Ltd.
56 The Furukawa Electric Co., Ltd.
[Import & Export]
57 Sojitz Corporation
58 Marubeni Corporation
59 Mitsui & Co. Plant Systems, Ltd.
[Technical Consultant]
60 Energy and System planning corp.
61 Chiyoda Corporation
62 JGC Corporation
63 NIPPON KOEI Energy Solutions CO.,LTD.
[Construction]
64 Hazama Ando Corporation
65 Kajima Corporation
66 Kumagai Gumi Co., Ltd.
67 Konoike Construction Co., Ltd.
68 Penta-Ocean Construction Co., Ltd.
69 Shimizu Corporation
70 The Zenitaka Corporation
71 Taisei Corporation
72 Takenaka Corporation
73 Tobishima Corporation
74 Nishimatsu Construction Co., Ltd.
75 JDC Corporation76 Ohbayashi Corporation
77 Fujita Corporation
78 Maeda Corporation
79 Sumitomo Mitsui Construction Co., Ltd.
80 Japan Commission on Large Dams
81 Japan Federation of Consruction Contractors[Services to Electric Power and Gas Industries]
82 IHI Plant Services Corporation
83 Kandenko Co., Ltd.
84 Taihei Dengyo Kaisha, Ltd.
85 Chubu Plant Service Co., Ltd.
86 Tokyo Energy & Systems Inc.
87 Tokyo Gas Engineering Solutions Corporation
88 Tokyo Densetsu Service Co.,Ltd89 Tokyo Power Technology Ltd.

[Services to Electric Power and Gas Industries]
90 Toshiba Plant Systems & Services Corporation
91 Tokyo Electric Power Services CO.,Ltd.
92 Nexeraise.Co.,Ltd.
[Automobile]
93 Honda R&D Co., Ltd.
[Consulting, Inspection]
94 Abeam Consulting Ltd.
95 Japan Power Engineering and Inspection Corporation[Energy Institute]
96 The Institute of Applied Energy
97 Kanto Electrical Safety Services Foundation
98 TEPCO Memorial Foundation
99 The Japan Institute of Energy
100 The Institute of Energy Economics, Japana total of 100 companies and organizations (as of April 2024)