The cost of keeping the world's lights on just went up. Saudi Aramco is hiking the price of its flagship Arab Light crude for its Asian customers by USD 17 a barrel for May deliveries. That brings the total premium to an unprecedented USD 19.50 over the Oman-Dubai benchmark.

To put that into perspective: The premium never cracked the USD 10 mark over the past 26 years.

Aramco is aggressively raising prices across the board to record levels, regardless of destination. European buyers will have to shell out a USD 24-30 premium over Brent for Saudi oil next month.

What changed? The widening Middle East war and Iran's near-total closure of the Strait of Hormuz snapped the region's traditional oil supply chains. A fifth of the world's oil typically flows through this narrow waterway. The disruption already sent Brent crude up more than 50%, trading at around USD 108 / bbl. A handful of Chinese, Indian, and Omani vessels navigated the strait recently, but the flow of global commerce is still way below its prewar levels.

REMEMBER- Riyadh has redirected the bulk of its shipments to Yanbu, its port on the Red Sea. Saudi and the UAE are practically the only Gulf producers with pipeline infrastructure capable of completely bypassing the strait. The rest of the region's output is mostly stuck.

BUT- Alternative routers are not nearly enough to plug the gap. Aramco is currently maxing out the East-West pipeline, pumping close to 5 mn barrels a day to the west coast. Despite handling record shipments at Yanbu, Saudi only managed to export about 50% of its normal overall oil volumes in March. Opec+ pledged on Sunday to boost production in May, but with the cartel's spare capacity bottlenecked behind the strait, those extra barrels are useless to the broader market.

The squeeze is set to hit Asian refineries the hardest, as they are structurally reliant on the specific sour crude grades the Middle East typically provides.

What comes next: A logistical headache for buyers. Aramco is reportedly now requiring customers to submit separate requests specifying how much oil they want from either port, explicitly noting that it will only supply the Arab Light grade out of Yanbu.

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