An intergovernmental organisation of 12 major oil-producing nations that coordinates petroleum production policies to stabilise oil markets and manage supply. OPEC members include Saudi Arabia, Iraq, UAE, Kuwait, Iran, and others. OPEC+ is the broader alliance including non-member producers such as Russia.
The Organization of the Petroleum Exporting Countries
OPEC is the intergovernmental organisation that has shaped the global oil market since 1960. Its decisions on production quotas move crude oil prices, influence energy costs for every industry on earth, and carry geopolitical significance that extends far beyond the petroleum sector. For anyone working in energy, commodities, manufacturing, or industrial supply chains, understanding how OPEC operates — and how its influence has evolved through the rise of OPEC+ — is essential context.
What OPEC Is
The Organization of the Petroleum Exporting Countries is a permanent intergovernmental body headquartered in Vienna, Austria. Its stated purpose is to coordinate and unify petroleum policies among member countries in order to secure fair and stable prices for petroleum producers, an efficient and regular supply of oil to consuming nations, and a fair return on capital for those investing in the industry.
In practice, OPEC functions as a production management cartel. Its primary mechanism is the setting of production quotas for each member country, collectively adjusting output to influence global supply and, by extension, the price of crude oil. When OPEC cuts production, prices tend to rise. When it increases output, prices tend to fall. The organisation’s ability to coordinate output among sovereign nations with competing economic interests gives it a unique — and frequently controversial — position in the global economy.
History and Formation
OPEC was founded on 14 September 1960 in Baghdad, Iraq, by five countries: Iran, Iraq, Kuwait, Saudi Arabia, and Venezuela. The organisation was created in response to the dominance of Western oil companies — the so-called Seven Sisters — that controlled production, pricing, and distribution in the major oil-producing regions. The founding members sought to reclaim sovereignty over their natural resources and exert collective influence over the terms on which their oil was sold.
The organisation’s early years were spent building institutional capacity and expanding membership. Qatar joined in 1961, followed by Indonesia and Libya in 1962, the United Arab Emirates in 1967, Algeria in 1969, and Nigeria in 1971. By the early 1970s, OPEC had accumulated sufficient market power to fundamentally reshape the global oil system.
The 1973 oil embargo — in which Arab OPEC members restricted exports to countries supporting Israel during the Yom Kippur War — demonstrated the organisation’s geopolitical leverage for the first time. Oil prices quadrupled, triggering a global economic crisis and permanently establishing OPEC as a force in international relations. A second price shock followed in 1979 during the Iranian Revolution, further cementing the link between OPEC decisions and global economic stability.
The decades since have seen periods of both extraordinary influence and internal fragmentation. The 1980s brought a price collapse driven by overproduction and demand destruction. The 1990s and 2000s saw cycles of quota discipline and quota cheating. The shale revolution in the United States, which gathered pace from 2010 onwards, fundamentally altered OPEC’s competitive position by creating a major new source of non-OPEC supply that could respond rapidly to price signals.
Current Members
As of 2026, OPEC has 12 member countries. Seven are in Africa, four in the Middle East, and one in South America:
Algeria, Republic of the Congo, Equatorial Guinea, Gabon, Iran, Iraq, Kuwait, Libya, Nigeria, Saudi Arabia, the United Arab Emirates, and Venezuela.
Former members include Angola (which withdrew in January 2024 over a quota dispute), Ecuador (withdrew January 2020), Indonesia (membership suspended since November 2016), and Qatar (withdrew January 2019 to focus on natural gas). The shifting membership reflects a recurring tension within the organisation: smaller producers often feel constrained by quotas that limit their revenue potential, while larger members — particularly Saudi Arabia — seek to maintain collective discipline to support prices.
Saudi Arabia is OPEC’s de facto leader and the world’s largest swing producer, with approximately 3 million barrels per day of spare production capacity — the largest buffer of any nation. The Kingdom’s ability to rapidly increase or decrease output gives it unmatched influence over both OPEC policy and global oil prices.
OPEC+: The Expanded Alliance
In late 2016, OPEC formalised a cooperation agreement with a group of non-OPEC oil-producing countries to create what is now universally referred to as OPEC+. The expanded alliance, currently comprising 23 nations, was formed to broaden the production coordination framework beyond OPEC’s membership and increase the organisation’s market influence.
The non-OPEC participants in OPEC+ include Russia, Kazakhstan, Oman, Azerbaijan, Bahrain, Brunei, Malaysia, Mexico, the Philippines, South Sudan, and Sudan. Of these, Russia is by far the most significant, as the world’s third-largest oil producer. The Saudi-Russian axis is the central relationship within OPEC+, and the ability of these two nations to coordinate their output decisions largely determines whether the alliance’s production targets hold.
OPEC+ collectively controls over 55% of global crude oil supply and holds the vast majority of the world’s spare production capacity. This gives the alliance enormous leverage over oil prices — though exercising that leverage requires continuous diplomatic management of competing national interests.
How OPEC Production Decisions Work
OPEC’s primary tool is the production quota — an agreed output ceiling for each member country, set at regular OPEC Conference meetings (typically held twice a year) and monitored by the Joint Ministerial Monitoring Committee (JMMC), which meets monthly. When market conditions change between conferences, extraordinary meetings can be called.
Since 2022, OPEC+ production management has operated through three layers of cuts. The first is a mandatory collective reduction covering all alliance members. The second is a set of additional voluntary cuts borne by eight key members: Saudi Arabia, Russia, Iraq, the UAE, Kuwait, Kazakhstan, Algeria, and Oman. The third is a gradual unwinding schedule that allows these voluntary cuts to be phased out over time as market conditions permit.
Total effective OPEC+ cuts currently stand at approximately 5.86 million barrels per day — equivalent to roughly 5.7% of global demand. This is a massive volume that gives the alliance significant influence over market balance. In March 2026, the eight key members agreed to begin a phased unwinding of 1.65 million barrels per day of voluntary cuts, starting with a modest increase of 206,000 barrels per day in April 2026. The alliance has emphasised that the pace of unwinding will be flexible and conditional on market conditions.
Compliance and the Cheating Problem
One of the enduring challenges for OPEC is quota compliance. Academic research has found that member countries have historically exceeded their production quotas on the vast majority of occasions. Political scientist Jeff Colgan’s analysis of the period 1982–2009 found that members cheated on 96% of their commitments — a remarkable figure that raises questions about the organisation’s effectiveness.
The incentive structure makes cheating rational for individual members: if everyone else cuts production and prices rise, a member that overproduces benefits from higher prices on a larger volume. The problem is that if everyone follows this logic, the collective cuts collapse and prices fall — the classic prisoner’s dilemma.
In the OPEC+ era, compliance monitoring has become more rigorous, with the JMMC reviewing monthly production data and the alliance publicly naming countries that exceed their quotas. Russia’s compliance with its OPEC+ commitments has been a persistent area of uncertainty, with independent agencies frequently estimating Russian production above its agreed target. For 2026, several members — including Iraq and Kazakhstan — have also been identified as overproducers and have committed to compensation plans to bring their cumulative output into line with targets.
OPEC’s Market Impact in 2026
The oil market in 2026 is defined by an unusual combination of factors: significant OPEC+ production restraint, geopolitical disruption in the Persian Gulf linked to tensions involving Iran, strong non-OPEC supply growth (particularly from US shale, Guyana, and Brazil), and uncertain demand signals from China and the broader global economy.
Brent crude has traded above $100 per barrel for much of early 2026, supported by disruptions to shipping through the Strait of Hormuz — a chokepoint through which approximately 20% of global oil trade passes. OPEC+ faces a delicate balancing act: too little production restraint and prices fall, hurting member revenues; too much restraint and high prices accelerate demand destruction, boost competing supply, and draw political pressure from major consuming nations including the United States.
The April 2026 OPEC+ ministerial meeting is among the most consequential since the alliance’s formation, with the group weighing whether to accelerate, maintain, or reverse its planned production increases in the face of conflicting market signals.
Why OPEC Matters Beyond Oil
OPEC’s influence extends well beyond the petroleum industry. Oil prices are a cost input for virtually every sector of the global economy. When OPEC cuts production and prices rise, the effects cascade through transport and logistics costs, petrochemical feedstock pricing, fertiliser production costs (natural gas and petroleum are key feedstocks for nitrogen fertiliser), manufacturing energy costs, and consumer inflation.
For the chemical industry specifically, OPEC production decisions affect the cost of naphtha (the primary petrochemical feedstock in Europe and Asia), the price of natural gas (through its linkage to oil in many long-term supply contracts), and the economics of any manufacturing process that is energy-intensive. For the fertiliser sector, oil price movements influence both the cost of nitrogen fertiliser production and the transport costs associated with global fertiliser trade.
Understanding OPEC — its structure, its internal dynamics, and its current market strategy — is therefore not optional for anyone operating in industrial markets. It is foundational.
This article is part of the Industrial Market Watch Oil and Gas reference series. For definitions of related terms, see the Oil and Gas Industry Glossary of Terms.