Why the world still runs on oil, and what would replace it

Oil is not simply a fuel. It is a raw material woven into plastics, pharmaceuticals, fertilisers, synthetic fibres, and the bitumen under every road. Even in countries that have electrified most of their passenger vehicles, oil remains the dominant energy source for heavy freight, aviation, shipping, and petrochemical manufacturing. That is the core reason the world has not moved on: there is no single substitute.

How oil came to dominate the global economy

The twentieth century was built around the energy density and ease of transport that crude oil provided. A barrel of oil contains roughly the energy equivalent of several weeks of human physical labour, and liquid fuels can be pumped, shipped, and stored at scale in ways that electricity still cannot match. As industrialisation spread through Asia in the latter half of the century, global demand grew steadily. Today, transportation, petrochemicals, and power generation together consume the vast majority of every barrel lifted from the ground.

The other reason oil proved so durable is infrastructure lock-in. Refineries, pipelines, tanker fleets, port terminals, and billions of internal-combustion vehicles represent sunk capital measured in the tens of trillions of dollars globally. Replacing that network is not a technical question alone; it is a financing and political question.

What the alternatives actually offer

Electricity, green hydrogen, sustainable aviation fuel, and advanced biofuels are the main candidates to reduce oil dependence. Each has a plausible role in a specific segment. Battery-electric technology is already competitive for passenger cars and urban buses, and its cost has fallen sharply over the past decade. Green hydrogen, produced by splitting water using renewable electricity, could eventually displace oil in steel-making and long-haul shipping, but production costs remain high and the logistics of handling a cryogenic gas at scale are formidable. Sustainable aviation fuel can be blended into existing jet engines without modification, but feedstock constraints mean supply is a small fraction of what the global aviation industry requires. No single alternative covers all use cases simultaneously.

Why the transition is slower than many forecasts suggested

Energy transitions in history have never been replacements; they have been additions. Coal did not displace wood globally. Natural gas did not displace coal. Each new energy source added to total consumption while the older one kept growing in absolute terms in many regions. The same pattern is visible today: renewable electricity capacity has grown rapidly, yet global oil demand has also continued to grow, driven by population growth and rising incomes in developing economies. The wealthy countries reducing their oil use are offset by rising demand elsewhere.

Geopolitics compounds the challenge. Oil-producing states have strong economic incentives to maintain demand, and major consumers have security interests in supply diversity. Price volatility caused by conflicts, sanctions, or supply disruptions consistently re-prioritises energy security over energy transition at the policy level.

What it means for Australia

Australia imports the majority of its liquid fuel needs, making the country exposed to price shocks from any supply disruption in the Middle East or along major shipping routes. The nation also has significant interests on both sides: as a liquefied natural gas exporter, it benefits from a world that still runs on hydrocarbons, while its critical minerals sector, particularly lithium and cobalt, stands to gain from electrification accelerating. Federal fuel excise is a meaningful revenue line, which means any rapid demand decline would require fiscal adjustment. For motorists, a prolonged oil transition means fuel prices will remain linked to decisions made in Riyadh, Houston, and Moscow for years to come.

The bottom line

Oil will remain the world's largest primary energy source for the foreseeable future, not because alternatives do not exist, but because the scale of substitution required across every sector simultaneously is without historical precedent. The transition is real, but it is measured in decades.

This article was compiled by AI and screened before publishing. See our editorial standards.