Japanese petrochemical giant Idemitsu Kosan has warned it may be forced to suspend ethylene production due to the effective closure of the Strait of Hormuz, a critical artery for global energy supplies.
The immediate trigger for this crisis is the geopolitical standoff in the Middle East. Following threats from Iran's Islamic Revolutionary Guard Corps (IRGC) to close the strait, commercial shipping traffic has ground to a halt. Major carriers have suspended bookings, citing the “effective closure” of the waterway, which chokes off the flow of naphtha, the primary feedstock for Japan's petrochemical plants.
This situation exposes a deep structural vulnerability for Japan. First, unlike U.S. producers who primarily use ethane, Japanese facilities are overwhelmingly designed to use naphtha. Over 90% of Japan's crude oil, from which naphtha is derived, comes from the Middle East and typically transits the Strait of Hormuz. Second, the Japanese petrochemical industry has been undergoing years of consolidation and capacity reduction in response to weak margins and oversupply from China. This has left the system with very little slack or redundancy to absorb a sudden supply shock like this.
While Japan maintains a strategic petroleum reserve equivalent to about 254 days of consumption, this is not a perfect solution. The reserves can buffer the supply of crude oil for fuel refineries, but they do not directly solve the logistical challenge of getting naphtha feedstock to petrochemical crackers if the shipping lanes remain closed. A handful of plants undergoing scheduled maintenance turnarounds are providing a temporary cushion by reducing immediate demand, but this is a short-term reprieve.
Ultimately, the industry's fate hangs in the balance. The fastest way to avert production shutdowns is a de-escalation of military tensions and the resumption of safe passage, possibly under the protection of naval convoys. If the blockade drags on for weeks, forced production halts at Idemitsu and other producers become increasingly likely, with significant knock-on effects for global supply chains.
- Steam Cracker: A large-scale industrial facility where hydrocarbons like naphtha are broken down (cracked) with steam at high temperatures to produce lighter, more valuable chemicals like ethylene.
- Naphtha: A flammable liquid hydrocarbon mixture derived from refining crude oil. It is a primary raw material (feedstock) for producing plastics and other chemicals.
- Feedstock: The raw material supplied to a machine or industrial process. In this context, naphtha is the feedstock for steam crackers.