For decades, energy power has been measured by familiar metrics: the size of a country’s oil reserves, its daily production and the scale of its exports. These indicators continue to shape discussions about global energy politics. Yet they overlook a strategic capability that has become increasingly important in an era of geopolitical instability: the ability to increase production rapidly when the market needs it most.

Recent crises have demonstrated that energy influence is no longer determined solely by how much oil a country possesses. It also depends on how quickly that country can respond when supply is disrupted. Reserves matter. But in a crisis, readiness matters more.

This overlooked capability is known as spare production capacity—the ability of a producer to raise output within a short period without requiring major new investment. Although often treated as a technical or operational issue, spare capacity has become an increasingly important instrument of international influence. Rather than viewing it merely as an industrial buffer, it may be better understood as a geopolitical asset that allows certain producers to stabilise markets, reassure consumers and strengthen their diplomatic position during periods of uncertainty.

The strategic value of spare capacity has become evident repeatedly over the past decade. Following the 2019 attacks on Saudi Aramco’s oil facilities, markets were confronted with one of the largest sudden disruptions in oil supply in modern history. Although prices initially surged, confidence gradually returned because major producers retained the ability to restore supply and offset part of the disruption.

The strategic value of spare capacity has become evident repeatedly over the past decade. Following the 2019 attacks on Saudi Aramco’s oil facilities, markets were confronted with one of the largest sudden disruptions in oil supply in modern history. Although prices initially surged, confidence gradually returned because major producers retained the ability to restore supply and offset part of the disruption.

Similarly, after Russia’s invasion of Ukraine and the subsequent sanctions on Russian energy exports, global attention shifted toward the limited number of producers capable of increasing output quickly enough to ease mounting pressure on international oil markets.

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These episodes reveal an important reality: markets respond not only to available supply but also to credible expectations of future supply. The knowledge that additional production can be mobilised if necessary often reduces volatility before a single additional barrel reaches the market.

This strategic function could be understood as what might be called Spare Capacity Diplomacy—the deliberate use of available but unused production capability to........

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