A full tank of heating oil in Ireland cost about €200 more in a single week in July 2026, after fighting between the US and Iran flared up again. A 1,000-litre order now averages around €1,300. More than 700,000 Irish households burn oil to heat their homes, close to 45% of the total, and the share climbs higher in the west and along the border.
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The jump undid months of relief. A full tank ran under €1,000 before the conflict began, and briefly neared €1,800 earlier in the year before falling back. In Northern Ireland, prices reached a four-month low by the end of June. Once the strikes resumed, Brent crude, the global benchmark, gained 15% to roughly $85 a barrel as tanker traffic through the Strait of Hormuz thinned out.
Why fighting near the Gulf reaches an Irish tank
Irish suppliers price imported kerosene and gasoil against the Platts benchmark for the Amsterdam-Rotterdam-Antwerp market, and sell on to distributors at that benchmark price. Distributors here keep only two or three days of kerosene in reserve, leaving almost no cushion when supply abroad tightens.
Northern Ireland saw the same spike
Two-thirds of Northern Irish households heat with oil, a bigger share than any other part of the UK. The Consumer Council for Northern Ireland tracked a 500-litre order rising from £346.59 to £445.37 in three weeks, up 29%. Raymond Gormley, the council’s head of energy policy, tied the rise to the same US-Iran escalation and expected prices to hold high “until peace negotiations resume.” Houthi attacks on tankers in the Red Sea added to the strain, threatening a route Saudi Arabia has used to bypass the Strait of Hormuz.
What the government did the first time
When the same conflict first drove up fuel prices in spring, farmers and truckers blockaded Ireland’s ports, its fuel depots and its one refinery for six days. Their target was fuel taxes, not any company or leader. The government gave in: it cut excise duty on diesel and petrol, paid out to hauliers and farmers, and pushed back a planned carbon tax rise by six months. Switcher.ie later recorded that increase, of €7.50 a tonne, moving from 1 May to 14 October 2026. Hannah Daly, a professor of sustainable energy at University College Cork, called the €505m package that followed “a ransom” paid to the fossil fuel system. She said renters were unfairly penalised by the carbon tax, because they lack the right to replace their oil or gas heating.
Why oil still beats petrol at the pump
Home heating oil carries VAT of 13.5% and excise of about €50.73 per 1,000 litres, both far below the 23% VAT and much larger excise charged on petrol and diesel. Switcher.ie’s own tracking put the national average for 500 litres at around €734 in September, still trending upward.
The postponed carbon tax rise falls due on 14 October, weeks after this latest spike.
