| 1970 | ITOCHU established Japan Low Sulfur Oil Co., Ltd. (JALOSCO) to conduct hydrocarbon exploration and production activities of offshore Southeast Sumatra (SES) and offshore Northwest Java (ONWJ) in Indonesia |
|---|---|
| 1971 | The first production of Cinta crude oil and Ardjuna crude oil |
| 1972 | Establishment of C. Itoh Energy Development Co., Ltd. (CIECO) for the exploration of the Vogelkop region in Indonesia Crude oil discovery in Kasim, Vogelkop |
| 1973 | The first production of Walio (Kasim) crude oil |
| 1977 | The first shipment of Ardjuna LPG |
| 1984 | CIECO merged with JALOSCO |
| 1987 | Crude oil discovery in Intan, offshore Southeast Sumatra |
| 1988 | Crude oil discovery in Widuri, offshore Southeast Sumatra |
| 1990 | Production Sharing Contract with Pertamina for the Kepala Burung block |
| 1991 | JanAcquisition of an additional working interest in onshore Vogelkop block |
| 1992 | SepAcquisition of an additional working interest in offshore Southeast Sumatra block |
| 1993 | JanCommencement of production from Kepala Burung block |
| FebAcquisition of an additional working interest in offshore Southeast Sumatra block | |
| AprC. Itoh Energy Development Co., Ltd. changed its name to ITOCHU Oil Exploration Co., Ltd. | |
| MayAcquisition of interests in three U.K. North Sea fields (Hutton, Northwest Hutton, and Hudson) | |
| 1995 | MarAcquisition of shares of Sakhalin Oil and Gas Development Co., Ltd.(SODECO) |
| 1996 | MarAcquisition of a working interest in Azeri, Chirag, and Deepwater Gunashli, South Caspian, Azerbaijan |
| JulAcquisition of an additional working interest in Azeri, Chirag, and Deepwater Gunashli, South Caspian, Azerbaijan | |
| 1997 | NovThe first production of Azeri light crude Oil |
| 1998 | DecAcquisition of a working interest in Atashkyakh, Yanan Tava, and Mugan Deniz, South Caspian, Azerbaijan Acquisition of a working interest in block 28/3, U.K. North Sea |
| 2000 | JulAcquisition of a working interest in Algeria Ohanet gas field |
| 2002 | JunAcquisition of interests in the Baku-Tbilisi-Ceyhan (BTC) Pipeline project |
| 2003 | OctThe first production of Algeria Ohanet gas |
| 2004 | MarSuccession by ITOCHU to the energy resource development business formerly belonging to CIECO |
| MayAcquisition of a working interest in the Cliff Head oil field, Australia | |
| 2005 | JunAcquisition of a working interest in the Alba field, the U.K. North Sea |
| 2006 | MayThe first production from the Cliff Head oil field |
| JunThe first transportation of ACG crude via the BTC Pipeline | |
| 2007 | JanAcquisition of exploration lease interests in the GoM Texas State Water |
| MarAcquisition of lease interests in 15 producing fields in the GoM offshore | |
| OctAcquisition of production license interests in the offshore Victoria in the southeast area of Australia | |
| 2008 | MayAcquisition of exploration blocks in Faroese Continental Shelf |
| JulAcquisition of exploration blocks in west of Shetland | |
| 2010 | AugAcquisition of an additional interest in Azeri, Chirag and Deepwater Gunashli, South Caspian, Azerbaijan. |
| OctAcquisition of exploration blocks in Niobrara (DJ Basin) Wyoming, U.S.A. | |
| 2011 | NovJoint acquisition of Samson Investment Company, a U.S. oil and gas development company. |
| 2012 | DecWestern Isles Development, two oil discoveries, Harris and Barra in the Northern Northsea was approved by DECC, U.K. |
| 2013 | SepAcquisition of exploration blocks in Eastern Siberia of Russia |
| 2014 | AprWestern Isles Project first well successfully tested |
| 2015 | OctAcquisition of an additional interest in BTC pipeline project. |
| 2016 | DecIchyodinskoye Oil Field entered into the production phase in the Eastern Siberia project. |
| 2017 | SeptExtension of PSA for ACG oil field in Azerbaijan was signed. |
| 2018 | MarAcquisition of the interests of West Qurna 1 oil field in Iraq. |
| 2021 | JunJoined the Geological Carbon Dioxide Storage Technology Research Association. |
| 2022 | AugCelebrated 50th anniversary. |
| 2023 | AprJoined the Japan Geothermal Association. |
