How OPEC+ Actually Sets Production Quotas - and Why Compliance Is Never 100%

In July 2021, the world's most important oil producers' club nearly broke over a single number. The United Arab Emirates refused to sign off on an OPEC+ output deal because it objected to its baseline: the reference figure, then about 3.168 million barrels a day, from which its production cut was calculated. Abu Dhabi had spent years and billions expanding capacity past that mark, and it did not want to keep cutting from a number frozen in 2018. Talks collapsed, prices whipsawed, and for a few weeks the group looked like it might crack. The compromise that ended the standoff raised the UAE baseline to 3.5 million b/d, effective May 2022. It was a fight over accounting, and it tells you nearly everything about how OPEC+ actually works.

The baseline is the whole ballgame

OPEC+ does not hand each country a raw production ceiling out of thin air. It assigns a reference baseline, then applies a cut expressed as a percentage or a fixed volume off that baseline. If you want a bigger quota, you do not argue for a bigger quota directly. You argue for a bigger baseline, because everything downstream is derived from it. That is why baseline math, not price forecasting, is where the real knife fights happen.

Baselines are anchored to historical output, usually a snapshot from a chosen reference month or period. That worked cleanly enough in 2018, when the modern OPEC+ framework took shape. The problem is that reservoirs, investment budgets, and national ambitions do not stay frozen. The UAE kept pouring capital into upstream capacity after 2018 and by 2021 its permitted output badly lagged what it could physically pump. A member that has invested heavily sees a stale baseline as a tax on its own capital. A member whose fields are in decline sees any baseline cut as a threat to the revenue its budget depends on.

Angola is the mirror image of the UAE. In late 2023 the group cut Angola's 2024 quota to about 1.11 million b/d, below what Luanda was actually producing at the time. Angola argued the lower target would choke the investment it needed and, rather than accept it, walked out of OPEC entirely in January 2024 after 16 years. The UAE fought to pump more; Angola left because it was told to pump less than it wanted. Same machinery, opposite grievances.

Who watches the meter

Setting a quota is easy. Knowing whether anyone is honoring it is the hard part, because members have every incentive to report flatteringly. OPEC+ solved this the only way it could: it does not take members' word for their own output. It uses secondary sources, a panel of independent data providers whose estimates are averaged to produce the official production figure used to judge conformity.

The panel is not fixed, and its composition is itself political. For years it leaned on outfits like S&P Global Platts, Argus Media, Energy Intelligence, and IHS Markit, alongside the International Energy Agency and the U.S. Energy Information Administration. In 2022 OPEC voted to drop the IEA as a compliance source after friction over the agency's forecasts. Then, effective February 1, 2025, the group replaced Rystad Energy and the EIA with the data-analytics firms Kpler, OilX, and ESAI. Who gets to hold the meter is a live negotiation, because the number those firms produce is the number that decides who is cheating.

Policing sits with the Joint Ministerial Monitoring Committee, or JMMC. It meets roughly every two months, reviews the secondary-source production data with a lag of several weeks, and flags who is over quota. The JMMC cannot punish anyone; it has no enforcement teeth. What it can do is name laggards, demand that over-producers submit compensation schedules to make up the extra barrels later, and apply the peer pressure that holds a voluntary cartel together. At its 62nd meeting on October 1, 2025, the committee reviewed July and August production and, in the group's careful language, reiterated the critical importance of achieving full conformity and compensation and reviewed updated compensation schedules. Read plainly: some members were still over the line.

The chronic over-producers

Certain names show up on the naughty list with grim regularity. Kazakhstan is the standout. Its giant Tengiz and Kashagan fields are run by international consortia on long-horizon expansion plans that do not bend easily to a monthly OPEC quota, and Astana has repeatedly blown past its target. Iraq is the other perennial, squeezed between OPEC discipline and a federal budget almost entirely dependent on crude revenue, complicated further by semi-autonomous Kurdish exports Baghdad does not fully control. By some estimates, Iraq, Kazakhstan, and Russia together accounted for roughly 890,000 b/d of overproduction in the first quarter of 2025 alone.

The driver is always national interest, not carelessness. A country with fresh capacity and a hungry treasury will lean toward pumping. A field operated by outside partners on fixed development schedules resists throttling. A government facing war costs or subsidy bills treats every extra barrel as budget it cannot politically forgo. Compliance is strongest among members with the fiscal cushion to sit on spare capacity, which is exactly why Saudi Arabia enforces so hard: it is usually the one absorbing the cuts that others quietly skip.

Why the gap is designed in, not bolted on

Here is the part outsiders miss. OPEC+ has no army, no fines, no courtroom. It is a voluntary arrangement among sovereign states, each of which can leave, as Angola did, or dig in until the group blinks, as the UAE did. Every quota is a negotiated peace among governments with clashing budgets and geology, and every member knows the others are shading the numbers too. Perfect compliance would require a member to leave money on the table on trust alone. That is not how sovereigns behave.

So the group builds slack into the system. It runs the compensation mechanism, promising that today's over-producer will cut extra tomorrow, knowing many of those makeup barrels never fully materialize. When it began unwinding the 2.2 million b/d of voluntary cuts from April 2025, it did so gradually and reserved the right to pause or reverse, precisely because it cannot fully control what its own members do at the wellhead. The eight countries in that tranche include the same names that habitually overshoot.

The number that never quite adds up

The headline figure OPEC+ announces after a meeting is a statement of intent, not a measurement of reality. The real output is whatever the secondary sources catch a month later, and it is almost always somewhat higher than the pledge, because the incentives of thirty-odd sovereign producers cannot all point the same way at once. That is not a scandal to the group. It is the cost of holding together a coalition with no coercive power over its members. The baseline fights, the JMMC scoldings, the compensation schedules that slip, the data-provider reshuffles: all of it is the same organism managing a permanent, structural gap between what it promises and what it pumps. Anyone waiting for OPEC+ to hit 100 percent compliance is waiting for the cartel to stop being a cartel of sovereign states. It will not.