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| Year | History of Idemitsu | Social Events |
|---|---|---|
| 1996 | Idemitsu Oita Geothermal Co., Ltd. started up operations at Takigami Power Station. | March: Provisional Measures Law on the Importation of Specific Kinds of Petroleum Refined Products abolished. |
| 1998 | All Idemitsu refineries and petrochemical plants obtained ISO 14001 certification. Idemitsu's first self-serve station opened in Hachioji Tokyo. |
February: Nagano Winter Olympics held. |
| 2000 | Increased capital to 35.6 billion yens by issuing preferred shares. | |
| 2001 | IR Preparations Office established and preparations for listing begin. | September 11 terrorist attacked on the United States. Petroleum Industry Law repealed. |
| 2002 | Electronic Materials Office established. | |
| 2003 | Production discontinued at Hyogo and Okinawa refineries. Tank fire at Hokkaido Refinery. Joint venture formed between Idemitsu Credit Co., Ltd and Credit Saison Co., Ltd. |
U.S.- and British-led forces launched their invasion of Iraq. Tokachi-oki earthquake |
| 2004 | Idemitsu Kosan and Idemitsu Petrochemical are merged. | NYMEX crude oil price broke through $50/barrel level. |
| 2005 | Prime Polymer Co., Ltd. established, joint venture between Mitsui Petrochemical, Inc and Idemitsu Kosan. Capital increased to 51.3 billion yen through third-party allocation of shares and cancellation of preferred stock. |
Kyoto Protocol took effect. |