Cosmo Oil operates the Chiba I refinery, which is located in Chiba, Japan. It is an integrated refinery owned by Cosmo Oil. The refinery, which started operations in 1963, has an NCI of 10.17.

Key processes of the refinery

Crude Distillation Unit (mbd): 177
Vacuum Distillation (mbd): 60
Catalytic Cracker (mbd): 40
Reformer (mbd): 37
Hydrotreater (mbd): 270
Isomerization (mbd): 6

The capacity of the refinery is expected to remain the same as 177mbd by 2030.

Maintenance activities at Chiba I refinery

The Chiba I refinery witnessed seven incidents during the period 2015-2020.

About Cosmo Oil

Cosmo Oil Co Ltd (Cosmo Oil), a subsidiary of Cosmo Energy Holdings Co Ltd, procures oil and refines, distributes, imports and exports petroleum products and petrochemical products. The company operates Chiba, Yokkaichi and Sakai refineries. These refineries produce petroleum products such as gasoline, kerosene, diesel oil, heavy fuel oil, naphtha and Jet fuel. Cosmo Oil also produces petrochemical products such as olefin products like Ethylene and aromatics including paraxylene, benzene and mixed xylene. The company sources its crude from the UAE, Saudi Arabia, Qatar, Mexico, Kuwait, Iran and others countries. Cosmo Oil is headquartered in Minato-ku, Tokyo, Japan.


Information on the refinery is sourced from GlobalData’s refinery database that provides detailed information on all active and upcoming, crude oil refineries and heavy oil upgraders globally. Not all companies mentioned in the article may be currently existing due to their merger or acquisition or business closure.