Nippon Oil Corporation

1888	Nippon Oil established.
1914	Oil first gushed out of Kurokawa Oil Well No. 5 in Akita Prefecture.
1921	Nippon Oil merged with Hoden Oil.
1931	Mitsubishi Oil established jointly by three Mitsubishi group companies (headquarters, mining, trading) and Associated Oil (later known as Getty Oil) in the United States.
1933	Koa Oil established.
1941	Nippon Oil merged with Ogura Oil.
1951	Nippon Petroleum Refining established jointly by Nippon Oil and Caltex.
1967	Nippon Oil Staging Terminal established.
1968	Tohoku Oil established.
1973	Okinawa CTS established.
1984	All the Getty Oil-owned Mitsubishi Oil shares transferred to Mitsubishi group companies. Business alliance formed between Nippon Oil and Mitsubishi Oil.
1995	Business alliance formed between Nippon Oil and Idemitsu Kosan.
1996	Nippon Oil terminated business alliance with Caltex and acquired a full stake in Nippon Petroleum Refining.
1998	Crude oil production started at Rang Dong Oil Field offshore Vietnam.
1999	Nippon Oil and Mitsubishi Oil merged to form Nisseki Mitsubishi. Business alliance formed between Nisseki Mitsubishi and COSMO Oil.
2001	New Service Station brand ENEOS launched.
2002	Nisseki Mitsubishi Refining, Koa Oil and Tohoku Oil merged into Nippon Petroleum Refining. Nisseki Mitsubishi renamed Nippon Oil.
2003	Natural gas production started offshore Malaysia (Helang Gas Field).
2004	Consignment refining contract signed with China Oil.
2005	Nippon Oil merged with Nippon Petroleum Gas.
2006	Business alliance formed with Japan Energy. Capital tie-up formed with INPEX Holdings. Nippon Petroleum Refining merged with Nippon Petroleum Processing.
2007	Business/capital alliance formed with SK Corporation (South Korea). A memorandum of understanding regarding long-term collaboration with China National Petroleum Corporation is concluded.
2008	Nippon Petroleum Refining merged with Nippon Petrochemicals. ENEOS CELLTECH, a joint company with Sanyo Electric Company for stationary fuel cells, established. Nippon oil conducted a management integration with Kyushu oil. Conclusion of Memorandum on Management Integration with Nippon Mining Holdings.
2009	SANYO ENEOS Solar, a joint company with Sanyo Electric Company for the production and sale of thin-film solar panels, established.