VIENNA — The Organisation of the Petroleum Exporting Countries meets next week, and the mechanics here are worth a close look. OPEC controls roughly 40% of global oil production, a share that gives its decisions outsized weight. The question on the table is whether the cartel will increase output, and the answer depends on a chain of calculations that begins in Tehran and ends at the petrol pump.
The trigger for this meeting was set months ago. In 2024, OPEC+ — the expanded group that includes Russia — agreed to cut production by 2 million barrels per day.
That was a deliberate move to prop up prices. The catch is that the calculus has shifted. Iranian supply is now at risk, and OPEC may need to decide whether to fill that gap itself or watch prices climb further.
Iran, the Strait, and the spare capacity question
Iran has threatened to block the Strait of Hormuz, a chokepoint through which a significant share of the world’s oil passes. Analysts consider this move unlikely, citing the U.S. naval presence in the region. But the threat alone has been enough to inject uncertainty into the market.
On closer reading, the real question is what happens if Iranian barrels actually disappear from the market — and who has the capacity to replace them. Saudi Arabia is the largest producer inside OPEC, with output of about 10 million barrels per day.
The kingdom also holds spare capacity of roughly 2 million barrels per day. That is the cushion. Follow the money: if OPEC decides to increase output, Saudi Arabia is the only member with the physical ability to make a meaningful difference.
The other members are either producing near capacity or constrained by their own infrastructure and investment levels. The decision is not purely economic.
Saudi Arabia has historically balanced its own revenue needs against the desire to maintain market share and keep prices from collapsing. A production increase would boost volume but could depress prices. The mechanics here are delicate: too much oil and the price falls, too little and the price rises to levels that damage demand and invite competition from non-OPEC producers.
The U.S. strategic reserve and the IEA option
The United States has its own lever. The Strategic Petroleum Reserve holds 375 million barrels, and the U.S. government may authorize a release to stabilise prices. President Trump authorised SPR releases in both 2022 and 2024, so the precedent exists.
Energy Secretary Jennifer Granholm stated on March 31, 2025, that “all options are on the table.” That is a signal, not a commitment, but it tells the market that Washington is watching. The International Energy Agency may also coordinate releases from member countries’ strategic reserves.
That happened in 2022, when the IEA orchestrated a collective drawdown to calm markets after Russia’s invasion of Ukraine. The mechanism exists. The question is whether the current situation warrants activating it again.
The difference this time is the political backdrop. The U.S. administration under President Trump has taken a different approach to energy policy than its predecessor.
The White House has signalled support for domestic production and has been skeptical of OPEC’s market management. A release from the SPR would be consistent with that posture — it is a tool to counter OPEC’s influence, not an endorsement of coordinated global action.
The OPEC+ alliance and the Russian factor
OPEC+ includes Russia, and that complicates the arithmetic. Russia has been a key partner in the production cut agreement, and its cooperation has been essential to keeping the cuts in place. But Russia is also under sanctions, and its ability to increase production is limited by Western restrictions on technology and investment.
The alliance holds, but the strains are visible. The meeting on April 5 will be held in Vienna, OPEC’s traditional home.
The format is familiar: ministers from member countries sit around a table and negotiate quotas. The outcome is never certain until the final communiqué is issued. But the parameters are clear.
OPEC controls 40% of global output. Saudi Arabia has 2 million barrels per day of spare capacity.
Iran is a wild card. The U.S. has a 375-million-barrel reserve and a history of using it. What to watch next is the language of the final statement.
If OPEC announces a production increase, the market will want to know the size and the timing. If it holds steady, the focus will shift to the Strait of Hormuz and the IEA. Either way, the decision will ripple through the global economy, affecting everything from the cost of gasoline to the balance sheets of oil-exporting nations.
