Every year, the two most influential voices in global oil market analysis — the International Energy Agency (IEA energy data) and OPEC official figures+ production decisions — publish their annual oil market outlooks. And every year, they disagree significantly on the trajectory of global oil demand. Understanding why they differ, and who is likely to be closer to the truth, is essential for anyone with a stake in energy markets.
The IEA’s View: Peak Demand in Sight
The IEA, which advises oil-consuming countries, has consistently taken the more bearish view on long-term oil demand. In its most recent World Energy Outlook, the agency pointed to the rapid growth of EV running costs vs petrol, improving energy efficiency at home, and the accelerating deployment of renewable energy as structural forces that will increasingly constrain oil demand growth.
The IEA’s base case scenario for 2026 projects global oil demand growth of around 0.8–1.0 million barrels per day (mb/d) compared to 2025, significantly below the historical average of 1.0–1.5 mb/d. In its more aggressive climate-action scenarios, the agency sees demand peaking within this decade and declining thereafter.
OPEC’s View: Sustained Growth Ahead
OPEC, which represents major oil-producing nations with a strong interest in maintaining high demand projections, typically publishes a more optimistic outlook. The organisation’s research arm points to growing populations, rising living standards in developing economies, and the slow pace of EV adoption outside wealthy countries as reasons to expect sustained oil demand growth through the 2020s and into the 2030s.
OPEC’s 2026 demand growth estimate is typically in the range of 1.2–1.5 mb/d — meaningfully above the IEA’s projection — and the organisation is more sceptical about the pace of the energy transition progress in emerging markets.
Who Is Closer to the Truth?
Both organisations have been wrong in the past — the IEA has historically underestimated demand growth, while OPEC has overestimated it. The truth likely lies somewhere between the two forecasts, with the outcome heavily dependent on variables including Chinese economic growth, the pace of EV adoption, and the policy environment in key emerging markets.
For investors, the divergence in forecasts is itself a useful signal: it reflects genuine uncertainty about the medium-term oil demand outlook, and argues for portfolios that are not overly concentrated in oil-dependent assets.
