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- 1924February 1924
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Nippon Juyu Co., Ltd. is founded as an importer and vendor of heavy oil.
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- 1942April 1942
- Upon assuming some of the operating assets of Nichibei Koyu Co., Ltd., Nippon Juyu Co., Ltd. changes its name to TOA Oil Co., Ltd., its current name.
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- 1950May 1950
- TOA Oil’s shares are listed on the Tokyo Stock Exchange.
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- 1952July 1952
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TOA Oil begins sales of Ostrich, a high-end lubricating oil.
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- 1953January 1953
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TOA Oil wins designation as a direct vendor of petroleum products.
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- 1955August 1955
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TOA Oil builds a refinery in Kawasaki-shi, Kanagawa Prefecture with refining capacity of 6,000 barrels per day, and begins refining operations there.
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- 1957February 1957
- TOA Oil begins sales of Kamome (“Seagull”), a kerosene product for home use.
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- July 1957
- TOA Oil increases its crude-oil processing capacity to 12,000 barrels per day.
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- 1960December 1960
- TOA Oil increases its crude-oil processing capacity to 15,000 barrels per day.
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- 1961March 1961
- TOA Oil increases its crude-oil processing capacity to 20,000 barrels per day.
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- 1962July 1962
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TOA Oil increases its crude-oil processing capacity to 50,000 barrels per day.
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- 1965August 1965
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In collaboration with Nippon Mining Co., Ltd. and Asia Sekiyu Co., Ltd., TOA Oil participates in the establishment of Kyodo Oil Co., Ltd. TOA Oil then transfers its sales and shipping segment to Kyodo Oil.
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- 1968January 1968
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TOA Oil establishes Ogishima Oil Terminal Co., Ltd.
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- 1969March 1969
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TOA Oil increases its crude-oil processing capacity to 100,000 barrels per day.
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- 1973June 1973
- TOA Oil establishes TOA Kyoseki Co., Ltd.
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- November 1973
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TOA Oil establishes Nagoya Oil Refinery.
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- December 1973
- TOA Oil transfers Nagoya Oil Refinery to TOA Kyoseki Co., Ltd.
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- 1976April 1976
- TOA Oil begins refining oil under contract to Showa Sekiyu K.K. and Shell Kosan K.K. (now Showa Shell Sekiyu K.K.).
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- August 1976
- TOA Oil establishes TOA Service Co., Ltd. (now TOA TECS Co., Ltd.).
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- 1977February 1977
- TOA Oil participates in the establishment of Niigata Joint Oil Stockpiling Co., Ltd., acquiring a stake in the company.
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- October 1977
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TOA Oil builds the “Flexicoker,” the world’s first heavy-oil thermolysis equipment.
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- 1978August 1978
- TOA Oil establishes East Ogishima Oil Terminal Co., Ltd.
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- 1979December 1979
- TOA Kyoseki is transferred to Nippon Mining Co., Ltd.
Showa Sekiyu K.K. (now Showa Shell Sekiyu K.K.) acquires a stake in TOA Oil, making it a member of the Showa Sekiyu Group.
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- 1983October 1983
- TOA Oil reduces its crude-oil processing capacity to 65,000 barrels per day.
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- 1987June 1987
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TOA Oil builds a Fluid Catalytic Cracker (FCC).
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- 2000February 2000
- TOA Oil headquarters is moved from Chiyoda-ku, Tokyo to Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture.
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- October 2000
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Showa Shell Sekiyu’s Kawasaki Refinery and TOA Oil’s Kawasaki Refinery begin unified operations under the new collective name Keihin Refinery.
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- 2001September 2001
- TOA Oil establishes Genex Co., Ltd., an independent power producer (IPP).
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- 2002December 2002
- The Company lays piping connecting to TonenGeneral Sekiyu’s Kawasaki Plant (now ENEOS Corporation Kawasaki Refinery), beginning acceptance of heavy oil from that facility.
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- 2003April 2003
- TOA Oil transfers its IPP operations to Genex Co., Ltd.
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- June 2003
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Genex’s Mizue Power Station begins operation and power sales.
The facility begins wholesale power supply to Tokyo Electric Power Company(now TEPCO Energy Partner, Inc.).
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- 2005October 2005
- TOA Oil conducts a third-party allocation of shares to Showa Shell Sekiyu K.K., making that company TOA Oil’s parent company.
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- 2008March 2008
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TOA Oil absorbs and merges with East Ogishima Oil Terminal Co., Ltd.
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- 2011September 2011
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TOA Oil ceases operation of Keihin Refinery Ogimachi Plant (now Showa Shell Sekiyu’s Kawasaki Works).
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- 2013August 2013
- TOA Oil changes its crude-oil refining capacity to 70,000 barrels per day.
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- 2017October 2017
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TOA Oil begins an operating partnership with Idemitsu Kosan Co., Ltd.
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- 2018June 2018
- TOA Oil absorbs and merges with Genex Co., Ltd.