For over fifty years, olio<\/a> e il US dollar<\/a> have been linked in a system that quietly underpins much of global trade and finance. When you buy a barrel of oil almost anywhere in the world, you pay in dollars. This arrangement, known as the petrodollar system, has helped maintain the dollar’s status as the world’s reserve currency, funded US government borrowing and shaped the foreign policy of oil-producing nations.<\/span><\/p>\n But the system is under more pressure than at any point in its history. The rise of renewable energy<\/a> is gradually reducing oil’s dominance in the global energy mix. Major oil producers are increasingly willing to accept non-dollar currencies. And the 2026 Strait of Hormuz crisis has exposed how fragile the world’s dependence on fossil fuel<\/a> chokepoints really is.<\/span><\/p>\n For investors, understanding the petrodollar is not just an exercise in history. It has real implications for currency markets, interest rates, commodity prices and the long-term trajectory of the US dollar.<\/span><\/p>\n <\/p>\n The petrodollar system traces its origins to the early 1970s. After President Nixon ended the dollar’s convertibility to gold in 1971, the US needed a new anchor for its currency. The solution came through a series of agreements with Saudi Arabia. In exchange for American military protection, Saudi Arabia agreed to price its oil exclusively in US dollars and to reinvest its oil revenues into US Treasury bonds. Other OPEC nations followed.<\/span><\/p>\n This created a self-reinforcing cycle. Because oil, the world’s most traded commodity, was priced in dollars, every country that needed oil also needed dollars. This generated constant global demand for the currency, allowing the US to borrow cheaply, run persistent trade deficits and fund its military and economic infrastructure at a scale no other country could match.<\/span><\/p>\n The recycling of oil revenues into US financial assets, a process known as petrodollar recycling, became one of the pillars of the post-war financial order. Even today, roughly 80% of global oil transactions are settled in dollars. The system has survived wars, financial crises and multiple attempts to challenge it.<\/span><\/p>\n <\/p>\n The petrodollar system matters to investors because it directly supports three things: the strength of the US dollar, low US borrowing costs and the global dominance of dollar-denominated financial assets.<\/span><\/p>\n When oil exporters reinvest hundreds of billions of dollars into US Treasuries and financial markets each year, they help keep US interest rates lower than they would otherwise be. This in turn supports scorta<\/a> valuations, immobiliare<\/a> prices and the affordability of US government debt. A weakening of this system would not cause an overnight collapse, but a gradual erosion could mean a weaker dollar, higher borrowing costs and a repricing of risk across global markets.<\/span><\/p>\n For anyone holding US equities, bonds, or dollar-denominated assets, the trajectory of the petrodollar system is worth watching closely.<\/span><\/p>\n <\/p>\n The most structural threat to the petrodollar is not geopolitical. It is the energy<\/a> transition itself.<\/span><\/p>\n Renewable energy is growing at a pace that would have seemed impossible a decade ago. According to the IEA, renewables are set to overtake coal as the world’s top source of electricity<\/a> in 2026, accounting for roughly 36% of global power generation. Solar<\/a> e wind<\/a> now represent nearly 20% of global electricity production, up from just 4% in 2015. In 2025 alone, the world added nearly 700 GW of renewable capacity, led by solar.<\/span><\/p>\n As the global economy gradually shifts away from fossil fuels, the fundamental link between oil and the dollar begins to weaken. If the world needs less oil, it needs fewer dollars to buy it. The demand that has sustained the dollar’s reserve status for half a century starts to erode, slowly but structurally.<\/span><\/p>\n This does not mean oil is disappearing from the global economy any time soon. Oil still powers the vast majority of transportation<\/a> e petrochemicals<\/a> remain essential to manufacturing. But the direction of travel is clear and investors who only look at today’s energy mix will miss the longer-term shift.<\/span><\/p>\n <\/p>\n Alongside the energy transition, a more immediate challenge to the petrodollar is coming from countries that are actively choosing to trade oil in currencies other than the dollar.<\/span><\/p>\n China and Saudi Arabia signed a currency swap agreement allowing for up to 50 billion yuan in bilateral transactions. While relatively small in absolute terms, the symbolism is significant, the world’s largest oil importer and its largest oil exporter are building the infrastructure to trade outside the dollar system. Saudi Arabia has expressed willingness to accept yuan for crude oil, a step that would have been unthinkable a decade ago.<\/span><\/p>\n Russia, cut off from dollar markets by sanctions, has shifted heavily toward yuan and other non-dollar settlement. Indian refiners are now settling Russian crude purchases in yuan and UAE dirhams, bypassing the dollar entirely. In March 2026, India purchased roughly 60 million barrels of Russian crude, with a significant portion settled outside the dollar system.<\/span><\/p>\n The BRICS bloc is also building alternative payment infrastructure (currently largely serviced by the SWIFT system). China’s Cross-Border Interbank Payment System (CIPS) processed the equivalent of $245 trillion in yuan-denominated transactions in 2025. India, as 2026 BRICS chair, has placed an expanded “BRICS Bridge” interoperability framework on the summit agenda.<\/span><\/p>\n None of this means the dollar is about to lose its reserve status. The dollar still sits on one side of roughly 89% of all foreign exchange transactions. But the share of global reserves held in dollars has fallen from 73% in 2000 to around 56% in 2025, a slow but steady decline.<\/span><\/p>\n <\/p>\n The 2026 Strait of Hormuz crisis has brought these themes into sharp focus. The effective closure of the world’s most important oil chokepoint has not only spiked energy prices but also exposed how deeply the global economy remains dependent on fossil fuel supply chains.<\/span><\/p>\n Iran’s decision to charge yuan-denominated transit tolls for vessels passing through the strait is a pointed example of how geopolitical events can accelerate de-dollarisation. It is a small step in practical terms but a significant signal about the direction of energy trade.<\/span><\/p>\n At the same time, the crisis has strengthened the case for energy diversification. Governments across Europe and Asia are reassessing their dependence on Middle Eastern oil and gas and investment in renewable energy infrastructure is likely to accelerate as a result. Each major energy disruption increases political willingness to fund the transition away from fossil fuels.<\/span><\/p>\n For investors, the Hormuz crisis is a reminder that oil-dependent portfolios carry not just commodity risk but also currency, geopolitical and supply chain risk that can materialise simultaneously.<\/span><\/p>\n <\/p>\n If the petrodollar system weakens, what comes next? There are several scenarios, though none involve an abrupt replacement.<\/span><\/p>\n A multi-currency energy market<\/b>. Oil and gas trade could gradually fragment across multiple currencies, with the dollar remaining dominant but sharing space with the yuan, euro and potentially digital currencies. This is already happening at the margins.<\/span><\/p>\n Critical minerals as the new oil<\/b>. As the energy transition accelerates, lithium, cobalt, copper and rare earths could become the strategic commodities of the 21st century. Unlike oil, these minerals are not concentrated in the Middle East and their trade is not anchored to the dollar in the same way. Countries like Australia, Chile, Argentina, and the Democratic Republic of Congo are emerging as key suppliers, and trade in these commodities is increasingly settled in non-dollar currencies.<\/span><\/p>\n Digital and blockchain-based settlements<\/b>. The BRICS bloc is exploring blockchain-based payment systems that could eventually support commodity trade outside traditional banking channels. China’s digital yuan (e-CNY) is already being used in cross-border pilot programmes.<\/span><\/p>\n A weaker but still dominant dollar<\/b>. The most likely outcome is not the end of dollar dominance but a gradual erosion, a world in which the dollar remains the leading currency but commands a smaller share of global reserves and trade settlement. This scenario still has meaningful implications for US borrowing costs, inflation and asset prices.<\/span><\/p>\n <\/p>\n The shift away from the petrodollar is slow-moving and unlikely to produce dramatic short-term market moves. But it creates several long-term themes that investors should consider:<\/span><\/p>\n Currency exposure<\/b>. A gradually weaker dollar favours international diversification and assets denominated in other currencies. Investors heavily concentrated in US dollar assets may want to consider broader exposure.<\/span><\/p>\n Commodities beyond oil<\/b>. Critical minerals, battery metals and agricultural commodities could see structural demand growth as the energy transition accelerates. These sectors offer exposure to the new energy economy.<\/span><\/p>\n Renewable energy infrastructure<\/b>. Solar, wind, battery storage and grid infrastructure are beneficiaries of both the energy transition and the geopolitical push toward energy independence.<\/span><\/p>\n Gold and alternative stores of value<\/b>. Central banks have been net buyers of gold for several consecutive years, partly as a hedge against dollar depreciation. Gold remains a natural portfolio hedge if de-dollarisation accelerates. Of course, gold carries its own risks, which we\u2019ve discussed in <\/span>another blog<\/span><\/a>.<\/span><\/p>\nWhat Is the Petrodollar System?<\/b><\/h2>\n
Why the Petrodollar Matters for Investors<\/b><\/h2>\n
The Renewable Energy Challenge<\/b><\/h2>\n
De-Dollarisation: From Theory to Practice<\/b><\/h2>\n
The Hormuz Crisis: A Real-Time Stress Test<\/b><\/h2>\n
What Could Replace the Petrodollar?<\/b><\/h2>\n
What This Means for Your Portfolio<\/b><\/h2>\n