The world oil market faces an even bigger surplus next year of as much as four-million barrels per day as OPEC+ producers and rivals lift output and demand remains sluggish, the International Energy Agency predicted on Tuesday.

The latest outlook from the IEA, which advises industrialised countries, expands its prediction of a 2026 surplus from about 3.3-million barrels a day last month. A surplus of four-million barrels a day would be equal to almost 4% of world demand, and is much larger than other analysts' predictions.

OPEC+ is adding more crude to the market after the Organization of the Petroleum Exporting Countries, Russia and other allies decided to unwind some output cuts more rapidly than earlier scheduled. The extra supply is adding to fears of a glut and weighing on oil prices this year.

IEA LIFTS OUTLOOK FOR SUPPLY, TRIMS DEMAND FORECAST
In the IEA's view, supply is rising far faster than demand. This year, it expects supply to rise by three-million barrels a day, up from 2.7-million barrels a day previously. Next year, supply will rise by a further 2.4-million barrels a day, it said.

The agency on Tuesday also trimmed its forecast for world demand growth this year to 710 000 barrels a day, down 30 000 barrels a day from the previous forecast, citing a more challenging economic backdrop.

"Oil use will remain subdued over the remainder of 2025 and in 2026, resulting in annual gains forecast at around 700 000 barrels per day in both years," the IEA said in a monthly report.

"This is well below historical trend, as a harsher macro climate and transport electrification make for a sharp deceleration in oil consumption growth."

IEA demand forecasts are at the lower end of the industry range, as the agency expects a faster transition to renewable energy sources than some other forecasters such as OPEC.

On Monday OPEC maintained its forecast that demand will rise by 1.3-million barrels a day this year, almost double the rate expected by the IEA, and said the world economy was doing well.

Oil prices LCOc1 declined on Tuesday, with Brent crude trading just below $62 a barrel. That was still up from a 2025 low of near $58 in April.

GLUT LOOMS
The IEA has been saying the world market looks oversupplied. Tuesday's report said global oil supply in September was up by 5.6-million barrels a day from a year ago, with OPEC+ accounting for 3.1-million barrels a day of the increase.

In a sign of extra supply heading to the market, the IEA said the amount of oil currently seaborne in September rose by 102-million barrels, which it called the largest increase since the Covid-19 pandemic, partly due to surging Middle East production.

As well as OPEC+, supply growth next year will also come from outside producers such as the US, Canada, Brazil and Guyana, the IEA said.

The IEA's view on the potential surplus is larger than that of others. A Reuters poll of analysts in September suggested the market could face an oversupply of 1.6-million barrels a day in 2026.

OPEC, in contrast, expects world oil supply to closely match demand next year, because it sees a much slower rate of expansion from outside OPEC+ as well as stronger demand.