| 1940 |
Established Imperial Oil Co., Ltd. (Showa 16) to unify the oil mining divisions of various companies, as a semi-public semi-private national policy company based on the Imperial Oil Co., Ltd. Law. |
| 1941 |
Established as a semi-governmental national policy company based on the Imperial Oil Company Act to unify the oil and gas division of various companies |
| 1941 |
Teikoku Oil Co., Ltd. is founded as a semi-government company to unify the existing Japanese oil exploration companies at the time. |
| 1941 |
The Imperial Petroleum Company was established. It was founded as a semi-public, semi-private national policy company based on the Imperial Petroleum Company Act to unify the petroleum mining divisions of various companies. |
| 1950 |
Reorganized as a private company |
| 1950 |
Becomes a private company. |
| 1950 |
(Showa 25) Reorganized as a private company. |
| 1950 |
Reorganized as a private company (Showa 25). |
| 1950 |
Teikoku Oil Co., Ltd. Becomes a private company. |
| 1960 |
Started development of water-soluble gas in the South Kanto Gas Field (Narutō Gas Field) |
| 1960 |
Begins water-soluble gas development at the Minami Kanto Gas Field (Naruto Gas Field). |
| 1960 |
Begins water-soluble gas development at the Minami Kanto Gas Field (Naruto Gas Field). |
| 1960 |
Started development of water-soluble gas in the Minami Kanto Gas Field (Narutō Gas Field) (Showa 35). |
| 1962 |
Completed Japan's first long-distance high-pressure natural gas pipeline (Tokyo Line) between Niigata and Tokyo |
| 1962 |
Completes Japan's first long-distance natural gas pipeline between Tokyo and Niigata Prefecture (Tokyo Line). |
| 1962 |
Completes Japan's first long-distance natural gas pipeline between Tokyo and Niigata Prefecture (Tokyo Line). |
| 1962 |
Completed Japan's first long-distance high-pressure natural gas pipeline (Tokyo Line) between Niigata and Tokyo (Showa 37). |
| 1966 |
Established North Sumatra Marine Oil and Gas Resources Development Co., Ltd., the predecessor of International Petroleum Development Co., Ltd. |
| 1966 |
North Sumatra Offshore Petroleum Exploration Co., Ltd. (precursor to INPEX CORPORATION) is founded as a company promoting the independent development of overseas oil resources in accordance with a contract signed with PERMINA (now PERTAMINA). |
| 1966 |
Established North Sumatra Marine Oil Resources Development Co., Ltd., the predecessor of International Petroleum Development Co., Ltd. (Showa 41). |
| 1967 |
Changed company name to Indonesia Petroleum Resources Co., Ltd. |
| 1967 |
(Showa 42) Changed company name to Indonesia Petroleum Resources Development Co., Ltd. |
| 1967 |
Changed company name to Indonesia Oil & Gas Development Co., Ltd. (Showa 42). |
| 1970 |
Discovered Ataka oil field off Mahakam, Indonesia. |
| 1970 |
Discovers the Attaka Field in the Offshore Mahakam Block in Indonesia. |
| 1970 |
(Showa 45) Discovered Ataka Oil Field off Mahakam, Indonesia. |
| 1970 |
Discovered Ataka Oil Field off Mahakam, Indonesia (Showa 45). |
| 1973 |
Established Japan Petroleum Development Co., Ltd. (JODCO). |
| 1973 |
Acquired interests in the ADMA block (oil production project) in the United Arab Emirates. |
| 1973 |
Japan Oil Development Co., Ltd. (JODCO) is founded. |
| 1973 |
Acquires interests in the ADMA Block located offshore Abu Dhabi in the UAE. |
| 1973 |
Japan Oil Development Co., Ltd. (JODCO) is founded. Acquires interests in the ADMA Block located offshore Abu Dhabi in the UAE. |
| 1973 |
(Showa 48) Japan Oil Development Co., Ltd. (JODCO) established. Acquired interests in the ADMA Block (oil production project) in the United Arab Emirates. |
| 1973 |
Established Japan Petroleum Development Co., Ltd. (JODCO) and acquired interests in the ADMA Block in the United Arab Emirates (Showa 48). |
| 1975 |
Changed company name to Indonesia Oil Co., Ltd. |
| 1975 |
(Showa 50) The Japanese company name was changed to Indonesian Petroleum Co., Ltd. (The English company name was changed in 1977 (Showa 52)). |
| 1975 |
Its Japanese corporate name is changed in 1975. |
| 1975 |
Changed the Japanese company name to Indonesia Oil Co., Ltd. (Showa 50) (English company name was changed in 1977). |
| 1975 |
Changes its corporate name to Indonesia Petroleum, Ltd.(Its Japanese corporate name is changed in 1975). |
| 1977 |
The English company name was changed in 1977 (Showa 52). |
| 1977 |
Changes its corporate name to Indonesia Petroleum, Ltd.(Its Japanese corporate name is changed in 1975). |
| 1977 |
Changes its corporate name to Indonesia Petroleum, Ltd. (Its Japanese corporate name is changed in 1975). |
| 1977 |
(English company name was changed in 1977 (Showa 52)) |
| 1979 |
Discovered one of the largest gas fields in Japan, Minami Nagao gas field (Niigata Prefecture). |
| 1979 |
Discovers the Minami Nagaoka Gas Field containing Japan's largest natural gas reserves in Niigata Prefecture. |
| 1979 |
Discovered one of the largest gas fields in Japan, the Minami Nagaoka Gas Field (Niigata Prefecture) (Showa 54). |
| 1984 |
Koshirahara plant completed and production started at Minami Nagao gas field. |
| 1984 |
Begins production at the Minami Nagaoka Gas Field following completion of the Koshijihara Gas Plant. |
| 1984 |
(Showa 59) Koshiji Hara Plant was completed, and production began at Minami Nagaoka Gas Field. |
| 1984 |
Completed Koshiji Hara Plant and started production at the Minami Nagaoka Gas Field (Showa 59). |
| 1994 |
Koyazawa plant completed. |
| 1994 |
Completes the Oyazawa Gas Plant. |
| 1994 |
Completed Oyazawa Plant (Heisei 6). |
| 1998 |
Acquired interests in the Kazakhstan North Caspian offshore block, Australia WA-285-P block, and Indonesia Maser block. |
| 1998 |
Acquires interests in the Offshore North Caspian Block in Kazakhstan; Permit WA 285-P offshore Australia; and the Masela Block offshore Indonesia. |
| 1998 |
(Heisei 10) Acquired interests in the Kazakhstan North Caspian Sea offshore mining block, Australia WA-285-P mining block, and Indonesia Maseara mining block. |
| 1998 |
Acquired interests in the North Caspian Sea offshore mineral rights in Kazakhstan, WA-285-P block in Australia, and Maserra block in Indonesia (Heisei 10). |
| 2000 |
Discovered Kashagan oil field, Ixisgas condensate field, and Abadi gas field. |
| 2000 |
Discovers the Kashagan Oil Field in Kazakhstan and the Ichthys and Abadi gas fields in the Timor Sea. |
| 2000 |
(Heisei 12) Discovered Kashagan Oil Field, Ixis Gas Condensate Field, and Abadi Gas Field. |
| 2000 |
Discovery of Kashagan Oil Field, Ichthyus Gas Condensate Field, and Abadigas Field (Heisei 12) |
| 2001 |
Changed company name to International Petroleum Development Co., Ltd. |
| 2001 |
Changes its corporate name to INPEX CORPORATION. |
| 2001 |
(Heisei 13) Changed company name to Japan Petroleum Exploration Co., Ltd. |
| 2001 |
Changed company name to Japan Petroleum Exploration Co., Ltd. (Heisei 13) |
| 2004 |
Merged with Japan Petroleum Development Co., Ltd. (JODCO). |
| 2004 |
Listed on the First Section of the Tokyo Stock Exchange. |
| 2004 |
Acquires Japan Oil Development Co., Ltd. (JODCO). |
| 2004 |
Listed on the First Section of the Tokyo Stock Exchange. |
| 2004 |
Acquires Japan Oil Development Co., Ltd. (JODCO). Listed on the First Section of the Tokyo Stock Exchange. |
| 2004 |
(Heisei 16) Merged with Japan Petroleum Development Co., Ltd. (JODCO) and listed on the First Section of the Tokyo Stock Exchange. |
| 2004 |
Merged with Japan Oil Development Co., Ltd. (JODCO), listed on the First Section of the Tokyo Stock Exchange (Heisei 16) |
| 2005 |
Azeri oil field production started in Azerbaijan Caspian Sea ACG block. |
| 2005 |
Production starts at the ACG Oil Fields in Azerbaijan. |
| 2005 |
(Heisei 17) Production began at Azerbaijan Caspian Sea ACG Block Azeri Oil Field. |
| 2005 |
Start of production at Azerbaijan Caspian Sea ACG Block Azeli Oil Field (Heisei 17) |
| 2006 |
Established a joint holding company, International Petroleum Development Teikoku Oil Holdings Co., Ltd., by International Petroleum Development Co., Ltd. and Teikoku Oil Co., Ltd. |
| 2006 |
INPEX and Teikoku Oil integrate their management and establish a joint holding company, INPEX Holdings, Inc. |
| 2006 |
(Heisei 18) Established a joint holding company, International Petroleum Development Teikoku Oil Holdings Co., Ltd., by International Petroleum Development Co., Ltd. and Teikoku Oil Co., Ltd. |
| 2006 |
Established a joint holding company, Japan Petroleum Exploration and Teikoku Oil, called "Japan Petroleum Exploration Teikoku Oil Holdings Co., Ltd." (Heisei 18) |
| 2006 |
International Petroleum Development Co., Ltd. and Imperial Petroleum Co., Ltd. established a joint holding company, 'International Petroleum Development Teisei Holdings Co., Ltd.' |
| 2008 |
国際石油開発帝石（株）発足 |
| 2008 |
Merged into International Petroleum Development Teikoku Oil Co., Ltd., with headquarters relocated to Akasaka, Tokyo. |
| 2008 |
INPEX CORPORATION is founded through a merger of INPEX, Teikoku Oil and INPEX Holdings. |
| 2008 |
The company headquarters are moved to Akasaka, Tokyo. |
| 2008 |
INPEX CORPORATION is founded through a merger of INPEX, Teikoku Oil and INPEX Holdings. The company headquarters are moved to Akasaka, Tokyo. |
| 2008 |
(Heisei 20) The company International Petroleum Development Teikoku Oil Co., Ltd. was established through a merger of International Petroleum Development Teikoku Oil Holdings Co., Ltd., International Petroleum Development Co., Ltd., and Teikoku Oil Co., Ltd., with headquarters relocated to Akasaka, Tokyo. |
| 2008 |
INPEX CORPORATION is founded through a merger of INPEX, Teikoku Oil and INPEX Holdings; headquarters moved to Akasaka, Tokyo. |
| 2008 |
INPEX CORPORATION is founded. INPEX CORPORATION is founded through a merger of INPEX, Teikoku Oil and INPEX Holdings. The company headquarters are moved to Akasaka, Tokyo. |
| 2008 |
INPEX CORPORATION is founded. |
| 2008 |
Establishment of Japan Petroleum Exploration Teikoku Oil (Heisei 20). Merged with Japan Petroleum Exploration Co., Ltd. and Teikoku Oil Co., Ltd., relocating headquarters to Akasaka, Tokyo (Heisei 20) |
| 2008 |
Japan Petroleum Exploration Co., Ltd. was established. Japan Petroleum Exploration Holdings Co., Ltd., Japan Petroleum Exploration Co., Ltd., and Imperial Oil merged to form Japan Petroleum Exploration Co., Ltd. The headquarters was relocated to Akasaka, Tokyo. |
| 2012 |
Final investment decision for Australia Ixis LNG project. |
| 2012 |
Reaches a Final Investment Decision (FID) on the Ichthys LNG Project in Australia. |
| 2012 |
(Heisei 24) Final investment decision for the Australia Ixis LNG Project. |
| 2012 |
Final investment decision for Australia Ichthyus LNG Project (Heisei 24) |
| 2013 |
Completion of Naoetsu LNG terminal. |
| 2013 |
Starts up the Naoetsu LNG Terminal in Japan. |
| 2013 |
Completion of Naoetsu LNG Base (Heisei 25) |
| 2014 |
Extension of the expiration date for the Upper Zakum oil field interests in the United Arab Emirates. |
| 2014 |
The concession agreement for the Upper Zakum Oil Field offshore Abu Dhabi is extended. |
| 2014 |
Extension of rights for Upper Zakum Oil Field, United Arab Emirates (Heisei 26) |
| 2014 |
The concession agreement for the Upper Zakum Oil Field offshore Abu Dhabi is extended. |
| 2015 |
Acquisition of interests in the United Arab Emirates ADCO oil field (oil production project) |
| 2015 |
Participation in the Salura geothermal IPP project |
| 2015 |
Acquires a participating interest in the ADCO Onshore Concession (now the Abu Dhabi Onshore Concession) in Abu Dhabi. |
| 2015 |
Joins the Sarulla Geothermal Independent Power Producer Project in Indonesia. |
| 2015 |
Acquires a participating interest in the ADCO Onshore Concession (now the Abu Dhabi Onshore Concession) in Abu Dhabi. Joins the Sarulla Geothermal Independent Power Producer Project in Indonesia. |
| 2015 |
(Heisei 27) Acquired interests in the UAE ADCO Oil Production Project and participated in the Salura Geothermal IPP Project. |
| 2015 |
Acquisition of rights for ADCO Block (Oil Production Project), UAE, and participation in Salura Geothermal IPP Project (Heisei 27) |
| 2016 |
Start of supply for the Toyama Line |
| 2016 |
Start of crude oil shipment from the Kashagan oil field off the North Caspian Sea in Kazakhstan |
| 2016 |
Starts full-scale operations of the Toyama Line in Japan. |
| 2016 |
The dispatch of crude oil from the Kashagan Oil Field in Kazakhstan starts. |
| 2016 |
Starts full-scale operations of the Toyama Line in Japan. The dispatch of crude oil from the Kashagan Oil Field in Kazakhstan starts. |
| 2016 |
(Heisei 28) Started supply of Toyama Line; began crude oil shipment from Kashagan Oil Field, North Caspian Sea, Kazakhstan. |
| 2016 |
Starts full-scale operations of the Toyama Line in Japan and the dispatch of crude oil from the Kashagan Oil Field in Kazakhstan starts. |
| 2016 |
Starts full‑scale operations of the Toyama Line in Japan. The dispatch of crude oil from the Kashagan Oil Field in Kazakhstan starts. |
| 2016 |
Commencement of supply from Toyama Line and crude oil shipment from Kashagan Oil Field offshore North Caspian Sea, Kazakhstan (Heisei 28) |
| 2017 |
Extension of the interest period for the Azerbaijan Caspian Sea ACG oil field interests by 25 years |
| 2017 |
The concession agreement for the ACG Oil Fields in Azerbaijan is extended. |
| 2017 |
(Heisei 29) Extended the expiry of the Azerbaijan Caspian Sea ACG Block interests by 25 years. |
| 2017 |
Extension of rights for Azerbaijan Caspian Sea ACG Block by 25 years (Heisei 29) |
| 2018 |
Acquisition of interests in the United Arab Emirates Lower Zakum oil field and extension of the interest period for the Satah Umalah oil field |
| 2018 |
Start of production at the Australia Ichthys LNG project |
| 2018 |
Start of production at the Australia Prelude FLNG project |
| 2018 |
Acquires an interest in the Lower Zakum concession offshore Abu Dhabi. |
| 2018 |
The concession agreement for the Satah and Umm Al-Dalkh Oil Fields offshore Abu Dhabi is extended. |
| 2018 |
Begins production at the Ichthys LNG Project in Australia. |
| 2018 |
Production starts at the Prelude FLNG Project. |
| 2018 |
Acquires an interest in the Lower Zakum concession offshore Abu Dhabi. The concession agreement for the Satah and Umm Al-Dalkh Oil Fields offshore Abu Dhabi is extended. Begins production at the Ichthys LNG Project in Australia. Production starts at the Prelude FLNG Project. |
| 2018 |
(Heisei 30) Acquired interests in the UAE Lower Zakum Oil Field and extended the expiry of the Satyr Um Al-Dar Oil Field interests; production started at Australia Ixis LNG Project; production began at Australia Prelude FLNG Project. |
| 2018 |
Acquires an interest in the Lower Zakum concession offshore Abu Dhabi, extends the concession agreement for the Satah and Umm Al‑Dalkh Oil Fields offshore Abu Dhabi, begins production at the Ichthys LNG Project in Australia, and starts production at the Prelude FLNG Project. |
| 2018 |
Acquires an interest in the Lower Zakum concession offshore Abu Dhabi. The concession agreement for the Satah and Umm Al‑Dalkh Oil Fields offshore Abu Dhabi is extended. Begins production at the Ichthys LNG Project in Australia. Production starts at the Prelude FLNG Project. |
| 2018 |
Acquisition of rights for Lower Zakum Oil Field, UAE, extension of rights for Sator Um Al Dalk Oil Field, commencement of production at Ichthyus LNG Project, Australia, and commencement of production at Prelude FLNG Project, Australia (Heisei 30) |
| 2019 |
Approval of development plan (POD) for the Indonesia Abadi LNG project |
| 2019 |
Receives approval of the revised plan of development for the Abadi LNG Project in Indonesia. |
| 2019 |
(Reiwa 1) Approved development plan (POD) for Indonesia Abadi LNG Project. |
| 2019 |
Approval of development plan (POD) for Abadi LNG Project, Indonesia (Reiwa 1) |
| 2021 |
Announcement of "Future Business Development - Towards a Net Zero Carbon Society by 2050" |
| 2021 |
Change of company name from Inpex Corporation to INPEX Corporation |
| 2021 |
Participation in the Norway North Sea Snorre project |
| 2021 |
Participation in the Indonesia Muara Laboh geothermal power project |
| 2021 |
(Reiwa 3) Announced future business development - towards a net-zero carbon society by 2050; changed company name from Japan Petroleum Exploration Co., Ltd. to INPEX Corporation; entered the Norwegian North Sea Snorre Project; participated in the Muara Laboh Geothermal Power Project in Indonesia. |
| 2021 |
Announcement of future business development towards a net-zero carbon society by 2050, change of company name from Japan Petroleum Exploration Co., Ltd. to INPEX Corporation, entry into Norway North Sea Snorre Project, and entry into Indonesia Muara Laboh Geothermal Power Project (Reiwa 3) |
| 2021 |
Announces "Business Development Strategy - Towards a Net Zero Carbon Society by 2050." Changes its Japanese corporate name to Kabushiki Kaisha INPEX. Joins the Snorre Project in the Norwegian North Sea. Joins the Muara Laboh Geothermal Power Project in Indonesia. |
| 2021 |
Announces "Business Development Strategy - Towards a Net Zero Carbon Society by 2050." |
| 2021 |
Changes its Japanese corporate name to Kabushiki Kaisha INPEX. |
| 2021 |
Joins the Snorre Project in the Norwegian North Sea. |
| 2021 |
Joins the Muara Laboh Geothermal Power Project in Indonesia. |
| 2022 |
Announcement of "Long-term Strategy and Medium-term Management Plan (INPEX Vision @2022)" |
| 2022 |
Participation in the Netherlands offshore wind power projects (Lufta Dauen, Borssele III/IV) |
| 2022 |
Announces the formulation of the “Long-term Strategy and Medium-term Management Plan (INPEX Vision @2022).” |
| 2022 |
Joins the Luchterduinen and Borssele III/IV offshore wind power projects in the Netherlands. |
| 2022 |
(Reiwa 4) Announced 'Long-term Strategy and Medium-term Management Plan (INPEX Vision @2022)'; entered offshore wind power projects in the Netherlands (Luftadauen, Borssele III/IV). |
| 2022 |
Announcement of “Long-term Strategy and Medium-term Management Plan (INPEX Vision @2022),” and entry into offshore wind power projects in the Netherlands (Luchterduinen, Borssele III/IV) (Reiwa 4) |
| 2022 |
Announces the formulation of the “Long-term Strategy and Medium-term Management Plan (INPEX Vision @2022).” Joins the Luchterduinen and Borssele III/IV offshore wind power projects in the Netherlands. |
| 2023 |
Participation in the UK offshore wind power project (Moray East) |
| 2023 |
Joins the Moray East offshore wind power project in the UK. |
| 2023 |
(Reiwa 5) Entered the UK offshore wind power project (Moray East). |
| 2023 |
Entry into offshore wind power project in the UK (Moray East) (Reiwa 5) |
| 2025 |
Announcement of "INPEX Vision 2035" |
| 2025 |
Announces the formulation of the “INPEX Vision 2035.” |
| 2025 |
Announcement of “INPEX Vision 2035” (Reiwa 7) |
