Japan may be preparing to as tensions in the Middle East threaten global energy supplies and raise concerns over key shipping routes used by Asian economies. In fact, the country holds the , after China and the US.
A senior Japanese lawmaker said the government has instructed at least one national oil storage facility to prepare for a possible release, according to Reuters.
Akira Nagatsuma of the opposition Centrist Reform Alliance said officials at the Shibushi national oil storage base were told to get ready for a potential release. An official from the Japan Organisation for Metals and Energy Security (JOGMEC) reportedly said the instruction came from the Agency for Natural Resources and Energy. However, the timing and scale of any release remain unclear.
This raises a key question, i.e., why does Japan need one of the largest oil stockpiles in the world?
Japan is one of the largest economies in the world, but it produces very little oil of its own. To keep factories operating, transport systems moving and cities powered, the country depends heavily on imported energy.
Experts estimate Japan imports about 90–95% of the energy it consumes.
If those imports were suddenly disrupted, the consequences could be immediate. Factories might slow down or halt production, transport networks could face disruptions, and electricity supply would come under pressure. In a country where industry and trade drive economic activity, energy shortages could quickly spread across multiple sectors.
Because of this vulnerability, Japan has long treated energy imports as a matter of national security rather than simply a commercial issue.
Most of Japan’s crude oil comes from the Middle East. Countries such as Saudi Arabia, the UAE and Kuwait are among its main suppliers.
The challenge is not only where the oil comes from but also how it reaches Japan. Much of the crude shipped from the Middle East travels through the Strait of Hormuz, one of the world’s most important energy shipping routes. Any conflict or disruption in that narrow waterway can quickly threaten Japan’s supply lines.
This dependence on a single region and a critical maritime route has shaped Tokyo’s long-term strategy of keeping large oil reserves as a safety net.
To guard against supply disruptions, Japan maintains one of the largest emergency oil stockpiles in the world.
These reserves are managed through a system that combines government-controlled stocks, inventories held by private oil companies and joint reserves maintained with oil-producing countries. The structure ensures that even during a major crisis, Japan has access to fuel for months.
According to official data, Japan has about 440 million barrels of oil in its reserves, enough to cover around 204 days of imports, most of which come from the Middle East.
Such stockpiles act as a buffer during geopolitical tensions, shipping disruptions or sudden spikes in global energy prices.
Japan’s economy is highly industrialised, and many sectors still rely heavily on oil.
Petrochemical plants use crude oil to produce plastics and other materials. Aviation requires large volumes of jet fuel, while shipping and transport continue to depend on petroleum products. Oil is also used in backup power generation and various heavy industries.
Major industrial zones such as Yokohama, Osaka and other coastal manufacturing centres host large refineries and petrochemical complexes. These facilities require a steady and reliable supply of crude oil to operate smoothly.
Even though Japan has invested heavily in energy efficiency and renewable technologies, oil remains a key component of its energy mix.
Japan’s cautious approach to energy security was shaped by past crises.
The oil shock of 1973 exposed how vulnerable import-dependent economies could be when global supplies are suddenly restricted. Prices soared and many countries struggled to secure enough fuel.
Decades later, another major event reshaped Japan’s energy policy. The Fukushima nuclear disaster in 2011 forced the shutdown of many nuclear reactors across the country. Before the accident, nuclear power generated around 30% of Japan’s electricity.
With nuclear plants taken offline, Japan had to increase imports of fossil fuels, including oil, coal and liquefied natural gas, to fill the gap.
These events reinforced a clear lesson for policymakers in Tokyo: energy security cannot be taken for granted.
Today, Japan’s vast oil reserves function as a form of national insurance. A country with minimal domestic energy resources, heavy industrial demand and supply routes that pass through politically sensitive regions cannot afford to rely solely on daily imports.
By maintaining large strategic reserves, Japan ensures it has time to respond to global crises, stabilise its energy supply and keep the economy running even during disruptions.
In simple terms, Japan’s oil stockpile acts like a strategic pantry for the entire nation, one designed to keep the country moving when global energy markets become uncertain.