1. What Iran offered, and why Washington said no
The offer came in two steps. On 22 September a senior Iranian official told Reuters that Tehran could reopen the strait within seven days if the United States eased military pressure and lifted the blockade (Israel Hayom citing Reuters). On 25 September Foreign Minister Abbas Araghchi presented the worked-out roadmap at the UN General Assembly: release of frozen Iranian funds, an end to oil sanctions and an end to the naval blockade, steps he said could be done in four to five days, with the strait reopened and final negotiations started on day seven (Al Jazeera). According to CBS News the package also covered a ceasefire across every front in the region, Lebanon included, with Qatar, Oman and UN officials in the middle.
President Trump rejected it on 26 September in front of reporters: "I'm rejecting their deal," adding that Iran wanted an agreement only "because they are losing so badly" (CBS News). The United States, he said, controls the strait (Times of Israel). The Wall Street Journal has reported that Trump told aides he expects to resume bombing after the November midterm elections (cited by Times of Israel). Araghchi's reply on 27 September: Iran will not back down on its conditions, only a negotiated settlement can end the stand-off, and Tehran is waiting for the mediators to relay Washington's final position (Al Jazeera, CBS News).
So the offer has failed for now, but the channel has not closed. The two sides read the situation in opposite ways: Washington sees Iran under pressure with no reason to be given concessions, Tehran sees the next move as Washington's. The record argues for caution either way. After the failed Islamabad talks the United States imposed its naval blockade in April, a memorandum did emerge in June, and on 8 July the ceasefire broke down again (Wikipedia, 2026 Strait of Hormuz campaign).
2. What actually flows through Hormuz today
The strait is not shut, but it is a bottleneck under US control: about 10 million barrels a day pass through (US Energy Secretary Chris Wright, 13 September), Iran itself exports zero barrels, and the main lanes have been cleared of mines (Admiral Brad Cooper, CENTCOM, video message of 20 September 2026, Business Standard citing Bloomberg). Before the war the strait handled about 125 large merchant ships a day (Israel Hayom) and roughly a fifth of global oil and LNG trade (EnergyNow). The gap is what the world market has been covering since March with stock draws, pipelines and higher US exports.
The bypass routes are themselves under fire. Saudi Arabia's East-West pipeline, which together with the UAE bypass carried around 5 million barrels a day around Hormuz in the second quarter (Fortune/McKinsey, 17 September), was knocked out by drones in mid-September and has been running at a low rate since; getting back to the old 4 million barrels a day will take six to eight weeks (OilPrice.com, 22 September). On 24 September Saudi air defences intercepted six Houthi ballistic missiles aimed at Taif province and the Yanbu area, the pipeline's Red Sea terminal, and Brent rose 3.4 per cent that day (Reuters via Investing.com). On 26 September drones targeted Riyadh and a missile flew towards Khamis Mushait; all were intercepted (Times of Israel). The EIA's outlook of 9 September assumes constraints lasting into the second quarter of 2027 (EIA STEO). Our glossary entry on the Strait of Hormuz explains why the waterway matters this much.
3. Three scenarios after the rejection
Scenario 1, stalemate: the rejection stands, the mediators keep working, and the strait stays a US-controlled bottleneck. That is where things stood on 27 September. In this state every headline moves Brent by two to four dollars a day, as it did last week: $99.97 on 22 September after the first offer (our API), $106.60 on 24 September after the Houthi missiles (Reuters), $104.32 on 25 September on hopes of a deal (EnergyNow). Friday's drop rested on a hope that Trump dismissed on Saturday; whether, and how far, the market reverses it on Monday is open. For heating oil this means a high price with no clear direction: German heating oil at €167.47 per 100 litres on 27 September (HeizOel24), French at €1,854 per 1,000 litres on 26 September (prixfioul.fr).
Scenario 2, a deal after all: crude reacts first and hardest. When reports of an agreement circulated on 12 June, Brent fell 3.37 per cent in one session to $87.33 (Yahoo Finance); Goldman Sachs put the value of a normalisation one month earlier at roughly $10 a barrel for late 2026 (Yahoo Finance, 21 June). Diesel and heating oil would follow more slowly, because US distillate stocks are at their lowest September level since 1982 (EnergyNow) and Russia's diesel export ban runs to the end of October (Hydrocarbon Processing). Gas would move with oil, because a reopening would bring Qatari LNG back.
Scenario 3, escalation: attacks on ships, pipelines or ports, or a return to air strikes. The market knows the pattern from the summer: after the ceasefire broke on 8 July, Brent climbed from $71.57 on 1 July to $96.78 on 24 July, and the year's high was $118.35 on 31 March (Wikipedia). This time diesel rather than crude would lead, because stocks are empty and on 26 September Ukrainian drones halted the Ilsky refinery in Russia's Krasnodar region, which produces nearly 6.6 million tonnes of fuel a year (Kyiv Independent). Which scenario plays out will be settled between Washington, Tehran and the mediators, not on the exchange; our Oil price today page keeps the daily reading.
4. What to do now, and what not to do
Do not trade on headlines, but take note that the picture has turned: the one piece of news that could make heating oil cheaper in the short run, a Hormuz deal, has been off the table since 26 September. If your tank is below a third, order; heating oil follows crude with a lag of days, and dealers pass on falls more slowly than rises (see pass-through effect). Above two thirds you can wait, but you are no longer waiting for a deadline, only for talks without a date. The full rule with every threshold is on Heating oil: buy now or wait?, and the Northeast outlook on Northeast heating oil forecast.
For diesel users relief comes more slowly whatever happens, for the reasons set out on our page about the diesel shortage of winter 2026/27. For gas customers in Europe the question is whether things calm down before winter: German storage stood at 56.8 per cent on 22 September (AGSI), details on gas storage and winter 2026/27. The broader status of the crisis is on our Hormuz crisis hub.
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