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Petroleum stockpiling in Japan is performed in two ways. First, there is government stockpiling, which is run directly by the Japanese government. Secondly, there is private stockpiling, which by law must be performed by private oil companies.
Under the government stockpiling scheme, approximately 50 million kiloliters of crude oil is stored in ten national petroleum stockpiling bases and tanks leased from the private sector across Japan. Under the private stockpiling scheme, approximately 40 million kiloliters of crude oil and oil products are stored by private oil companies in accordance with their obligations to stockpile oil under the law.
The national stockpiles and the private sector stockpiles of oil, totaling approximately 90 million kiloliters, form a common asset of the nation. This volume equates to approximately 168 days of import protection (as of March 2006). What this means is that the Japanese economy could continue to function normally for approximately 168 days in the event of total disruption of oil imports.

Petroleum Stockpiling System

Tomakomai-tobu National Petroleum Stockpiling Base, Hokkaido Joint Oil Stockpiling Base

Akita National Petroleum Stockpiling Base