Japan & the Strait of Hormuz.
No major economy is more Hormuz-dependent than Japan. Around 88% of its crude imports cross the strait; alternative routes simply do not exist for an island nation with no pipelines. The hedge has always been inventory: Japan holds roughly 240 days of net imports across government and commercial reserves, more than the United States or any European peer. The post-Fukushima nuclear retrenchment widened the gap between fossil-fuel exposure and the country's long-term decarbonisation path; restarting idled reactors is the most material short-cycle response to a sustained closure. LNG supply is partially diversified (Australia, Russian Sakhalin, and US Gulf cargoes balance Qatari volumes), but power-sector substitution to gas during a crisis is what tightens that market further. The structural answer Japan is now building is a multi-decade pivot to hydrogen and ammonia imports from countries that do not route through the strait.
Strait status now
EFFECTIVELY CLOSED
Crude imports via Hormuz
88%
Daily import value at risk
$200M
at $73.34/bbl Brent
Strategic reserve
240d
days of net imports
Energy profile
- Oil consumption
- 3.2 mbpd
- Crude imports
- 3.1 mbpd
- Hormuz crude dependency
- 88%
- Hormuz LNG dependency
- 12%
- Reserve days
- 240d
- Reserve volume
- 500 mbbl
Top suppliers
- 01Saudi Arabia· largest
- 02United Arab Emirates
- 03Kuwait
- 04Qatar
- 05Russia (LNG only)
Key facts
- World's third-largest oil importer and the most Hormuz-exposed major economy.
- Roughly 88% of crude imports transit the strait; almost no overland alternative exists.
- Government plus commercial reserves cover ~240 days of net imports, the highest reserve ratio in the OECD.
- Post-Fukushima nuclear restarts have not closed the structural fossil-fuel gap.
- Refining is concentrated on the Pacific coast; the Sea of Japan side has limited alternative-supply infrastructure.
Vulnerabilities
- Island geography eliminates pipeline alternatives.
- Electricity grid still ~70% fossil-fuel-fired despite renewables build-out.
- No domestic crude production of any meaningful scale.
- Refining margins compress immediately when freight rates spike on the Cape route.
Mitigations
- Largest national strategic reserve in days-of-supply terms; private inventory adds a further 90 days.
- Long-term LNG contracts with Australia, Russia (Sakhalin), and the United States diversify gas supply.
- Restart of idled nuclear capacity is the principal hedge against a sustained closure.
- Active diplomatic engagement with both Iran and Saudi Arabia, including a historical "third-party" posture.
- Hydrogen and ammonia import projects (Australia, the Gulf) are positioned as a multi-decade structural exit.
Historical context
The 1973 oil shock reset Japan's energy strategy: it built the world's deepest strategic stockpile, diversified suppliers, and accepted a heavier nuclear share. The 2011 Fukushima accident reversed the nuclear track and forced a return to fossil fuel imports, exposing the same chokepoint Japan had spent decades hedging against.