OPEC and OPEC+: Members, Oil Prices and Global Energy Politics

The Organization of the Petroleum Exporting Countries (OPEC) is an international organization created in 1960 to coordinate oil policy among major crude exporters. OPEC+ is the wider framework, formed from 2016 onward, that links OPEC members to outside producers, especially Russia and other countries important to global supply. Both structures try to influence prices through tools of supply management and diplomatic signaling: quotas, cuts, compensation and messages to consumers.

OPEC does not control world oil as if it were a single authority. It brings together sovereign states with different fiscal realities, technical capacities, reserves, sanctions and regional rivalries. Its politics work through bargaining: Saudi Arabia usually has the greatest ability to adjust supply; other members operate under limits created by security, investment or infrastructure. The group’s strength lies in organizing expectations about supply, the sharing of sacrifice and the duration of collective discipline, without relying on direct control over prices.

Summary

• OPEC was created in Baghdad in 1960 as a producer response to the power of major international companies and to the search for permanent sovereignty over natural resources.
• Membership must be read with a date attached: the founders were Iran, Iraq, Kuwait, Saudi Arabia and Venezuela, but accessions, suspensions and withdrawals, including the United Arab Emirates’ exit in 2026, have changed the group’s political weight.
• OPEC+ emerged from the 2016 Declaration of Cooperation, after the price fall that began in 2014, and was consolidated by the 2019 Charter of Cooperation.
• Saudi Arabia remains the main swing producer; Russia gave OPEC+ geopolitical weight; and recent compensation mechanisms show that the central problem is still making members and partners do what they promised.
• The energy transition, shale oil, Asian demand, spare capacity concentrated in a few countries and internal producer discipline limit the group’s ability to support prices over the long term.

What OPEC and OPEC+ Are

OPEC was founded by five countries: Iran, Iraq, Kuwait, Saudi Arabia and Venezuela. Its headquarters first passed through Geneva and then, on September 1, 1965, moved to Vienna, where the organization maintains its secretariat. The statute provides for founder members, full members and associate members, although practice has focused on founders and full members. To join, a country must be a significant net exporter of crude oil and obtain approval from the founders and from a qualified majority of the other full members. That rule makes accession both a technical and a political act: the candidate needs oil and must remain acceptable to governments that compete with one another.

The list has never been stable. The organization has incorporated waves of producers from Africa, Latin America and the Gulf, and it has lost members whenever national priorities no longer fit collective discipline. In 2026, the United Arab Emirates’ exit was especially sensitive: it removed from OPEC a producer with large expansion capacity and a history of friction over quotas it considered too low. The word “member” describes a position in which national sovereignty, spare capacity and collective coordination are always being negotiated, rather than a permanent list.

OPEC+ is different. It is not a separate international organization with its own founding treaty equivalent to the OPEC Statute. The name refers to cooperation between OPEC and non-OPEC producers, consolidated by the Declaration of Cooperation of December 2016 and by the Charter of Cooperation of 2019. Russia is the most important outside actor, and the framework has expanded to producers in Eurasia, the Gulf, Southeast Asia and Africa. Added to OPEC members, those countries represent enough world production to make coordinated cuts credible and shift expectations before actual output even appears in the statistics. In many market readings, OPEC accounts for roughly a third of global production and a much larger share of proven reserves. OPEC+ increases that weight by adding major outside producers to the original core.

Origins: Oil, Sovereignty and the Seven Sisters

OPEC’s creation should be understood in the context of decolonization and permanent sovereignty over natural resources. Before the 1960s, the major international oil companies known as the Seven Sisters influenced the entire oil chain, from extraction to marketing. Some historical estimates credit that group of companies with control over a large share of world oil production outside the Soviet bloc. When those companies lowered administered prices, exporting countries understood that public revenues, economic planning and political autonomy depended on private decisions made outside their territories, not on sovereign choices of energy policy.

OPEC responded to this problem by creating a coordination forum among producer states. The organization defended fair and stable prices for producers, regular supply for consumers and an appropriate return for investors. The formula was diplomatic and had to sound reasonable to every side. In practice, the main goal was to change the balance of power between producer governments and international companies. The 1968 petroleum policy declaration gave legal and political language to that ambition, and OPEC began treating oil as a matter of state, shifting the center of gravity from companies to producer governments, not as a simple corporate concession.

The 1970s gave the organization worldwide visibility. The Arab-Israeli war of 1973, the Arab oil embargo and producer decisions to take greater control of their resources caused a sharp rise in prices. The second shock, linked to the Iranian Revolution of 1979 and regional instability, reinforced the idea that political events in the Middle East could affect inflation, growth and external accounts in consumer countries. OPEC’s first summit of heads of state and government, held in Algiers in 1975, widened the group’s agenda by linking oil, development and reform of the international economic order. For importing governments, OPEC became a symbol of energy vulnerability. For exporters, it showed that natural resources could finance industrialization, infrastructure and social policy.

Quotas, Discipline and the Saudi Role

OPEC tries to influence prices mainly through production targets. In an oversupplied market, cuts can reduce inventories and raise prices. When scarcity is a risk, production increases can ease pressure on consumers and prevent a price surge that destroys demand. The mechanism works only if discipline is credible. Every producer has an incentive to defend collective cuts in public and sell more oil if it can do so without penalty. OPEC’s permanent problem is turning production promises into real behavior, since cartel credibility depends less on the communique than on the barrel delivered.

Saudi Arabia occupies a special position in this mechanism. With large reserves, advanced infrastructure and significant spare capacity, Riyadh can raise or reduce production faster than most members. That condition makes it a swing producer. If it accepts deeper cuts than others, it supports the price and protects collective revenues. If it tires of compensating for other members’ indiscipline, it can raise production and pressure competitors. In the mid-1980s, after fragile quota attempts and falling demand, Saudi Arabia’s decision to defend market share helped drive prices down. The 1986 crisis revealed the weakness of any cartel when its leading producer stops absorbing the collective sacrifice alone.

Discipline also depends on technical capacity. Some members cannot reach their quotas because of war, sabotage, underinvestment or the decline of older fields. Others would like to produce more and face financial sanctions, insurance restrictions, logistical blocks or difficulty accessing technology. Iran is a recurring example: it has vast reserves, although its export volume depends heavily on sanctions and nuclear negotiations. The rivalry between Iran and Saudi Arabia matters here: oil, Gulf security and strategic alignments make production policy a regional issue, not only a commercial one.

There is also a problem of optimal price. A barrel that is too expensive helps revenues in the short term and encourages competitors, energy efficiency and political pressure from consumers. A barrel that is too cheap disrupts exporter budgets, reduces investment and can create future scarcity. OPEC therefore seeks a range that is politically defensible, fiscally useful and able to sustain investment, without turning high prices into a permanent incentive for energy substitution.

OPEC+ and Russia’s Entry

OPEC+ emerged when OPEC alone was no longer enough to manage shocks in supply and demand. In the 2010s, the expansion of shale oil in the United States reduced OPEC’s ability to support prices without losing market share. When traditional producers cut output, American firms using hydraulic fracturing could respond quickly to higher prices. Coordination with outside producers, especially Russia, increased the weight of cuts and distributed part of the political cost.

The Declaration of Cooperation of 2016 was the central instrument of this change. With the supply glut that began in 2014, OPEC and non-OPEC producers agreed on an adjustment of about 1.8 million barrels per day to accelerate market stabilization. In 2019, the Charter of Cooperation gave a more permanent character to dialogue between OPEC and non-OPEC producers, without turning OPEC+ into an autonomous organization equivalent to OPEC. The routine of consultations, technical meetings and common messages showed that contemporary oil politics depends on mobile coalitions and regular diplomacy among producers: no isolated producer can organize the world market without taking account of rivals, partners and outside producers.

Russia’s presence turned the framework into a geopolitical instrument. Moscow gained a regular coordination channel with Riyadh and other Gulf monarchies; Saudi Arabia could influence prices with support from a major producer outside OPEC. The relationship did not remove conflict. In March 2020, at the start of the COVID-19 pandemic, the lack of agreement between Russia and Saudi Arabia contributed to a sharp fall in prices. Soon afterward, both countries returned to negotiations over deep cuts, since the collapse in demand threatened every producer’s revenues. OPEC+ strengthened coordination and made bargaining harder by incorporating Russian interests and those of other outside partners into disagreements already present inside OPEC.

Pandemic, Ukraine War and Voluntary Cuts

The COVID-19 pandemic showed how vulnerable the oil market is to demand shocks. With mobility restrictions, reduced air travel and economic slowdown, demand for fuels fell quickly. OPEC+ responded with very large cuts: OPEC itself describes the 2020 adjustment as a cut of 9.7 million barrels per day, an unprecedented volume in the group’s recent history. As demand began to recover in 2021, the group gradually restored production.

Russia’s invasion of Ukraine in 2022 changed the environment again. Western sanctions, the redirection of flows toward China and India, the G7 price cap and uncertainty over Russian supply made OPEC+ more politically sensitive. For Western consumers, production cuts could look like indirect support for Moscow or an attempt to support prices during an inflationary period. For producers, higher interest rates, economic uncertainty and volatility justified supply restraint. In 2022, the swing was clear: after prices near $120 per barrel in the middle of the year, the fall toward the $90 range fed renewed pressure for cuts.

Since 2022, the group has used a combination of formal cuts and additional voluntary cuts. Some countries, led by Saudi Arabia and Russia, announced their own reductions to strengthen the effect of collective agreements. In 2023 and 2024, those reductions were extended several times, and the sum of formal and voluntary cuts reached several million barrels per day. In June 2026, a group of seven OPEC+ producers led by Saudi Arabia and Russia was still discussing the gradual return of part of the voluntary cuts. The planned adjustment for July was 188,000 barrels per day, under monitoring by the Joint Ministerial Monitoring Committee and with compensation until December 2026. OPEC+ influences prices through the barrel removed from the market and through the political signal that its members will defend a certain price range; in this architecture, compliance and compensation become almost as important as the announcement of the cut.

This architecture is hard to read. The market must separate what is in the communique from what appears in production, exports, inventories and crude quality. One country can promise to cut and still export more if it consumes less at home. Another can have a high quota yet fail to produce after years of underinvestment. A third can meet the formal target and still betray the political intention of the agreement. This gap between announced number and delivered barrel explains OPEC+ communiques’ emphasis on compliance, monitoring and compensation.

United Arab Emirates and Internal Fissures

The United Arab Emirates’ exit in 2026 made an old tension visible. Abu Dhabi had invested for years to expand production capacity and wanted a higher baseline for calculating its quotas. From the Emirati point of view, limiting production could mean leaving revenue underground just as the energy transition makes the future value of reserves uncertain. For Saudi Arabia and other producers dependent on collective discipline, too many exceptions weaken the quota system and encourage every member to ask for special treatment.

The Emirati case matters for a simple reason: spare capacity is the main instrument of power inside an oil cartel. Countries with little extra capacity promise to raise production without being able to do so quickly. Countries with mature fields or damaged infrastructure depend on investment and political stability. The United Arab Emirates and Saudi Arabia were among the few producers able to add supply relatively quickly. When such a country leaves the group, OPEC loses part of the flexibility that lets it respond to shocks and balance cuts by other members, in addition to current barrels.

The decision shows that OPEC has always lived between sovereignty and discipline. The organization was born to return sovereignty to producers in the face of major international companies. Decades later, some producers invoke that same sovereignty to escape collective limits. The contradiction is structural: OPEC exists for collective action, yet its members remain states seeking to maximize revenue, diplomatic autonomy and national strategy, even when that weakens common coordination.

Brazil, Consumers and the Energy Transition

Brazil’s participation in OPEC+ as a political associate, without a vote and without a quota obligation, illustrates a shift in the debate. Brazil is a major oil producer, particularly through its pre-salt fields, and presents its foreign policy as supportive of the energy transition and climate action. By moving closer to the forum, Brasília sought dialogue with major producers without accepting cut discipline that would limit its production autonomy. The Charter of Cooperation included Brazil in 2025, reinforcing a flexible format of political and technical proximity, without entry into OPEC or automatic submission to production targets.

This position has several layers. For Brazil, taking part in dialogue with producers helps it follow decisions that affect prices, investment and public revenues. The same space allows it to argue that oil-dependent countries must plan the transition before a disorderly fall in demand. For OPEC+, Brazil’s presence shows that the forum can attract relevant producers without requiring full accession. Brazil uses OPEC+ as a space for energy conversation without giving up national production autonomy or accepting mandatory cut discipline, and OPEC+ uses Brazil as a sign of relevance beyond the original core.

For consumers, OPEC and OPEC+ are ambivalent institutions. When prices rise, importing governments accuse producers of restricting supply and feeding inflation. If prices fall sharply, those same consumers can benefit from cheap energy; energy companies, poorer producing countries and future investment suffer. The International Energy Agency and major importers follow OPEC+ decisions for their effects on transport, food, external accounts and monetary policy. A change of a few million barrels per day may look small against world consumption, but it can shift expectations when inventories are low or geopolitical risk rises.

The energy transition does not immediately remove oil’s weight. Sectors that are hard to electrify, from aviation to petrochemicals, still depend on hydrocarbons. At the same time, climate policies and electrification technologies reduce expectations of unlimited demand growth. The divergence between scenarios is central to the dispute. The International Energy Agency describes markets toward 2030 as marked by slowing demand, rising spare capacity, changes in refining and growth in natural gas liquids tied to petrochemicals. OPEC, in the World Oil Outlook 2026, projects a different path: global energy demand 23% higher by 2050, oil consumption reaching 124 million barrels per day and a need for $17.7 trillion in oil-sector investment between 2026 and 2050. The dispute is about which future will be financed, who will bear the risk of investing and who will pay for the adaptation of oil-dependent economies, not only about current barrels.

Limits of OPEC’s Influence

OPEC and OPEC+ have real power, and that power is limited on three immediate fronts. The first is internal discipline. If many members produce above target, the announced cut loses credibility. If many must compensate for past overproduction, current policy remains trapped in earlier promises. The second is productive capacity: some countries accept quotas they can no longer meet; others want higher quotas after investing in expansion. The third is outside competition. Shale oil, offshore production, strategic reserves and energy substitutes reduce traditional producers’ control. The group’s influence depends on discipline, real capacity and the reaction of competitors outside the cartel.

The fourth limit is political. Security shocks, sanctions and diplomatic disputes change production without asking the organization for permission. Cases such as Libya, Iran and Nigeria show how internal conflict, financial restriction or physical insecurity can affect supply. Russia, after 2022, showed how a central OPEC+ producer can face sanctions and redirect exports for strategic reasons. The United Arab Emirates, in 2026, showed another limit: a producer can decide that its national strategy is worth more than staying in the club. In such cases, the organization coordinates responses without controlling the cause of the shock.

The fifth limit is temporal. Production cuts can support prices in the short term; very high prices encourage efficiency, substitution and competing production. Very low prices, by contrast, reduce investment and can create future scarcity. OPEC and OPEC+ try to navigate between these extremes as they defend a narrative of continued investment in oil before governments and companies that calculate climate, technological and regulatory risks. The permanent dilemma is defending producer revenues without provoking a reaction that accelerates the reduction of oil dependence and lowers the future value of reserves.

Why OPEC Still Matters

OPEC still matters: oil remains a strategic commodity. The price of a barrel influences inflation and maritime freight as well as public budgets and exchange-rate stability, and producing countries finance public policy, imports and infrastructure projects with oil revenues. Consumer countries depend on predictable energy for industry, transport and daily life. In this environment, the decision by a few producers to cut, maintain or expand supply can change global expectations within hours.

The organization also matters as a diplomatic forum. OPEC and OPEC+ meetings bring together producers that may be rivals elsewhere, from the Gulf to Africa and Latin America. The forum does not resolve those conflicts, but it creates a technical and political space in which ministers negotiate numbers, timelines and public messages. This routine reduces uncertainty and allows disagreements to be managed before they become a price war. Even when the final decision is economic, the process is diplomatic: delegations calculate revenues and read the political environment around sanctions, wars, alliances, elections and relations with consumers.

OPEC is not, however, a world government of oil. It is a coalition of producer states trying to turn distinct national interests into collective signals that the global energy market can read. When members’ incentives are aligned, its influence is large. When they diverge over prices, quotas, sanctions or investment, its capacity declines. OPEC+ expanded the reach of this coordination and made bargaining harder. Global energy politics still depends on an unstable combination of sovereign decisions, technology, demand, climate and market expectations. OPEC should be read less as a price-control machine than as a gauge of the tension between national sovereignty, energy interdependence and climate transition.