Eurozone inflation accelerated sharply in August, driven by a renewed surge in energy costs linked to the war in Iran and disruptions around the Strait of Hormuz, putting the European Central Bank in a difficult position as it weighs another interest-rate increase.
Headline inflation rose to 3.3% in August from 2.9% in July, reaching its highest level since September 2024, according to a flash estimate from Eurostat on Tuesday. The increase was largely driven by energy, with energy inflation accelerating to 14.3% from 10.3%.
The data mark a significant reversal for the euro area’s inflation trajectory. Europe, a net importer of energy, has been particularly exposed to the disruption in global oil and gas markets since the Iran conflict intensified and shipping through the Strait of Hormuz became constrained.
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The increase in headline inflation came even as underlying price pressures showed some moderation. Core inflation, which excludes energy, food, alcohol and tobacco, eased to 2.4% from 2.5%.
That gap could give the ECB some room to argue that the latest inflation spike is primarily an energy shock rather than evidence of a broad-based acceleration in domestic prices. The risk for policymakers, however, is that prolonged energy costs begin feeding into wages, transportation, services and consumer prices more broadly.
Financial markets were already heavily pricing an ECB rate increase at the central bank’s September 10 meeting. LSEG data showed traders assigning a 98.9% probability to a 25-basis-point increase, which would take the policy rate to 2.5%.
The ECB raised its key rate to 2.25% in June, its first increase since 2023, as policymakers responded to renewed global inflationary pressures associated with the Iran conflict.
The latest inflation figures could strengthen the case for further tightening, but they also expose the central bank to a difficult policy trade-off. Raising rates to contain an externally driven energy shock risks weakening demand at a time when higher financing costs are already weighing on households and businesses.
“The ECB faces a dilemma: a trade-off between higher interest rates and economic cost,” Joe Nellis, head of economic research at MHA, said. “Higher borrowing costs will continue to squeeze heavily indebted households, weaken housing markets and make investment more expensive for businesses.”
For companies, particularly smaller firms, the combination of higher energy bills and more expensive credit could create a double squeeze. Businesses that are already absorbing elevated operating costs may have less capacity to invest, hire or expand if borrowing costs rise further.
“For SMEs in particular, another increase in financing costs could mean investment plans being indefinitely postponed or abandoned altogether,” Nellis said.
The energy component is likely to remain the critical variable for the ECB. The Strait of Hormuz is a major transit route for global oil and liquefied natural gas supplies, meaning any prolonged restrictions could keep Europe’s energy costs elevated even if underlying inflation continues to moderate.
That creates a particularly difficult policy environment for the ECB. Monetary policy can weaken demand and prevent temporary price shocks from becoming entrenched, but it cannot directly increase the supply of oil or natural gas or reopen disrupted shipping routes.
The key question for investors will therefore be whether the August increase proves temporary or begins to broaden into the wider economy. If energy prices remain elevated long enough to push up services and wage growth, the ECB could face pressure to maintain or extend its tightening cycle. If the energy shock fades while core inflation continues to decline, policymakers may have greater scope to limit further rate increases.
For now, the August data have shifted the inflation debate back toward the ECB’s familiar problem: how to contain renewed price pressures without imposing additional damage on an economy already facing higher energy costs and tighter financial conditions.