OPEC+ December Preview: Spare Capacity, Not Demand, Is the Only Number Left

OPEC+ meets on December 1 with Brent settled at $113.40 a barrel on Friday, its second consecutive weekly close above $113, and WTI near $100.50. The spread between the two benchmarks has widened to roughly $12.90, unusually wide for a market this tight, and that gap is the cleanest signal of what is actually scarce: seaborne crude with a short voyage to Asia, not barrels sitting in Oklahoma. For a group that spent three years managing demand expectations, the agenda has changed.

The arithmetic that matters is spare capacity. Effective spare capacity — production that can be brought online within 30 days and sustained for 90 — is estimated at roughly 2.1 million barrels a day, with the overwhelming majority held by Saudi Arabia and the UAE. Every other member is producing at or near its ceiling. That means the group's ability to respond to a further supply disruption is close to a rounding error against global consumption of about 104 million barrels a day, and it explains why the futures curve has moved into deep backwardation rather than simply repricing upward.

The cuts on the table total roughly 3.7 million barrels a day group-wide, including 1.65 million barrels a day of voluntary reductions that several members have been rolling forward quarter by quarter. The unwinding schedule was paused in the third quarter when the Middle East risk premium spiked, and the December meeting is the first real opportunity to restart it. Restarting means selling more barrels into a market that is already pricing scarcity — economically attractive, politically awkward, and technically constrained by the fact that several members cannot hit their quotas anyway.

Producers have a strong incentive to keep prices elevated. Brent above $110 funds budget breakevens across the Gulf and has repaired the fiscal position of members that were borrowing to cover deficits two years ago. But the physical market is starting to show the cost of tightness: refined product cracks in Asia have widened enough to compress refining margins for independent processors, and diesel demand in Europe is running below seasonal norms because the price is doing the rationing that policy will not. A group that holds too long risks doing lasting damage to its own demand base.

Consumer-side pressure is building but has few tools left. Strategic reserves in the US sit near multi-decade lows after two years of drawdowns, and a coordinated release would be a smaller intervention than the 2022 version precisely because there is less in the tank. The political economy of $113 crude in an election-adjacent year is straightforward: gasoline prices are the most visible inflation print in the world's largest economy, and the Federal Reserve's December decision sits four days after the group meets.

Three scenarios are worth pricing. Unwinding 400,000 barrels a day would add supply into a market that needs it and likely take Brent toward $105-108 while steepening the curve. Holding the cuts steady keeps Brent in the $113-118 range and extends backwardation. Deepening them is the tail case, and it would push Brent through $120 with the two-year Treasury yield following. The base case is a modest unwind dressed up as continuity — but the market will trade the spare capacity number, not the communique.