1971 – 1980
| 1971 | Japan NUS Co, Ltd. (JANUS) was founded based on the capital and technology of NUS Corporation and JGC Corporation and with capital participation by Tokyo Electric Power Company for the business purpose of offering nuclear power related consulting and engineering services. |
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| 1972 | JANUS has started consulting and engineering services related to environmental issues. |
| 1974 | Kansai Electric Power Company and Chubu Electric Power Company have acquired capital. |
| 1977 | JANUS expanded nuclear power field to the entire energy field. |
1981 – 1990
| 1990 | JANUS has started global-scale environment-related business and waste-related business. |
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1991 – 2000
| 1991 | JANUS has started consulting and engineering services related to system development in the general science and technology and industrial fields. |
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| 1996 | Energy-related business division of NUS Corporation was sold to Scientech. Following this, Scientech and JANUS signed a business cooperation agreement. |
| 1998 | ARIA Technologies S.A. and JANUS signed a business cooperation agreement. Virginia Power Nuclear Services and JANUS signed a business cooperation agreement. |
| 1999 | National Economic Research Associates, Inc. (NERA) and JANUS signed a business cooperation agreement. |
2001 – 2010
| 2003 | Value Management Institute, Inc. and JANUS signed a business cooperation agreement. |
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| 2004 | Tokyo Bay Ecosystem Research Center, Faculty of Science, Toho University and JANUS signed a business cooperation agreement. |
| 2006 | Tsinghua University and JANUS implemented a Chinese CDM-related project together. |
| 2007 | Sogreah (currently Artelia) and JANUS signed a business cooperation agreement. |
2011 – 2020
| 2012 | Beijing Zhenyoutang ITD Co., Ltd. and JANUS signed a business cooperation agreement. |
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