European natural gas futures rose in after-hours trading on Thursday, tracking gains in global crude prices as the escalating conflict in the Middle East heightened concerns over energy supplies and transit through the Strait of Hormuz.
Front-month Dutch TTF futures climbed 3.475% to 82.000 euros ($95.34) per megawatt-hour, while British NBP futures gained 3.819% to 205.220 British pence ($2.78) per therm.
On Wednesday, Iran said it had struck more than a dozen vessels attempting to pass through the strait and warned it would intensify attacks if the US continued strikes on Iranian territory, raising the risk of deeper and more prolonged disruptions to global energy markets.
Fewer than 10 ships were reported to have transited the Strait of Hormuz over the latest 24-hour monitoring period, according to news reports, compared with the pre-conflict norm of around 140 per day.
European gas markets are also facing tighter pipeline supplies. Maintenance in Norway and lower Algerian flows to Italy are limiting deliveries to Europe, Trading Economics said.
The supply concerns come as Europe and Asia approach the end of summer gas storage injection seasons, increasing competition for LNG cargoes ahead of winter and adding pressure to already-tight global markets.
European gas inventories remain below seasonal norms. Storage facilities were 67.33% full, compared with 79.73% at the same point last year, according to Gas Infrastructure Europe. Inventories were also below the five-year average of 83.7% for this period, according to the Swiss Federal Office of Energy.