Cushing: the Oklahoma terminal that sets the US oil price

The Cushing tanks, in Oklahoma, fell to about 19.7 million barrels as of 26 June 2026, a low since 2014, within a whisker of their operating floor. It is here, in a pipeline crossroads of 8,000 inhabitants, that the WTI price is physically set. Small plumbing, big consequences.

One imagines the oil price forming on screens, in London or New York. It also forms, and first of all, in a network of steel tanks laid on the plains of Oklahoma. Cushing is the point where the abstraction of the futures contract touches metal: crude arrives there, is stored there, leaves from there. When these tanks empty fast, it is not a logistical detail, it is a tension signal that propagates up the whole price curve. In late June 2026, they emptied to the point of brushing their lower limit.

Why a pipeline crossroads makes the price of the barrel

The futures contract on WTI, the US oil benchmark, is not an abstract bet on an index. It is a commitment to physical delivery of crude, and the place of that delivery is written in black and white in the contract specifications: Cushing, Oklahoma. Whoever holds a WTI contract to expiry without unwinding it must take or make delivery of real barrels, in the Cushing tanks. The WTI price is therefore, literally, the price of crude at Cushing.

This status is no geographical accident. Cushing sat at the crossroads of the first US pipelines at the start of the twentieth century, and the NYMEX made it the delivery point of its WTI contract in 1983. Today, some thirty pipelines connect to it, with a working storage capacity of about 76 million barrels. Crude from the Permian basin, from the Dakotas or from Canada transits there before descending to the refineries and export terminals of the Gulf of Mexico. This hub role makes the Cushing stocks a barometer: when they rise, the US market is awash with crude; when they melt, physical demand pulls barrels out faster than they arrive.

This also explains an episode that stayed in memory. In April 2020, at the collapse of demand, the Cushing tanks were threatening saturation. For lack of anywhere to deliver, the May WTI contract went into negative territory, down to minus $37 a barrel: contract holders paid to get rid of crude they no longer knew where to put. The lesson works both ways. Tank filling is not anecdotal; it can make the WTI price diverge from any world-market logic. To place this crossroads within the whole of the oil machinery, our guide on reading the oil market details the link between stocks, paper and physical.

The data: twelve weeks of drawdown

Now to the figures published each Wednesday by the US Energy Information Administration (EIA). Its weekly series of Cushing stocks tells, over spring 2026, a nearly uninterrupted decline. The stock peaked around 31.5 million barrels in early April. It fell to 18.96 million on 19 June, its lowest point, before a slight refill to 19.67 million on 26 June. Over twelve weeks, nearly 12 million barrels left the terminal, at a pace close to one million a week.

Two reading cautions are needed. First, these figures are weekly and revisable: an isolated point is not a trend, and the rebound of the last week recalls that the system rebalances. Second, a low stock is not in itself a shortage. It must be set against the terminal’s capacity and above all against the threshold below which the terminal ceases to function normally. That is where the data takes on meaning.

The operating floor, an invisible wall

A storage tank never empties completely. At the bottom stagnates an unusable layer of sediment, water, paraffin and residue, what the trade calls the tank bottoms. Above it, enough volume must be kept for the pumps to hold their pressure, for transfers between tanks to remain possible and for outgoing pipelines to keep feeding refineries and terminals. Below a certain threshold, the machinery seizes up. For the whole Cushing complex, this operating floor is estimated at around 20 million barrels, an order of magnitude on which sector analysts converge, including Wood Mackenzie.

The issue is therefore not the average filling, but the proximity to the threshold. At 26% of its capacity, Cushing is nowhere near overflowing; on the contrary, it is the opposite that worries. A terminal approaching its floor loses its shock-absorber function: it no longer has a cushion to absorb a mishap, whether an incident on an incoming pipeline or a spike in refinery demand. This scarcity of available volume comes at a price, and it is paid on the futures market.

Why the tanks are emptying now

Several currents pull crude out of Cushing at the same time. The most powerful is exports. The United States now ships a record volume of crude, on the order of 5.6 million barrels a day according to Kpler, and this demand draws barrels toward the Gulf of Mexico terminals rather than toward the Oklahoma tanks. To this is added a light maintenance season: US refineries ran at nearly 95% of capacity, consuming more crude than usual. Finally, supply disruptions in the north, with the threat of Canadian wildfires to oil-sands production, reduce incoming flows.

The geopolitical backdrop matters too. The Iran shock of spring 2026 and the partial closure of the Strait of Hormuz tightened the world crude market and made US barrels all the more sought after for export. We described the bill of that episode in our article on the Hormuz supply chain. The paradox is worth underlining: the same tension that inflates world prices empties the Cushing tanks, because it pushes the United States to export more.

The price signal: the curve in backwardation

A terminal near its floor translates mechanically into the structure of the futures market. When the immediately available barrel becomes scarce, buyers pay a premium to obtain it right away rather than in a few months. The price curve then goes into backwardation: near-dated maturities trade higher than distant ones. It is the opposite of contango, which signals abundance and rewards whoever stores.

Spring 2026 saw this slope steepen. According to Kpler, the spread between the first and third WTI maturities (the M1-M3 spread) rose toward $7 a barrel by mid-June, a marked backwardation that reflects the physical tension at Cushing. Another symptom, the price gap between Gulf of Mexico crude (Magellan East Houston) and Cushing compressed, falling to about $1 against 4 a month earlier: the sign that the market now wants to keep its barrels on site rather than systematically sending them to export. Backwardation is not a speculators’ whim, it is the price translation of the geography of the tanks.

Several possible trajectories

Where does Cushing go from here? Three scenarios take shape, and they must be taken for what they are, analyst hypotheses, not forecasts.

The first scenario is that of the rebuild. OPEC+ raised its production by nearly 600,000 barrels a day between April and June, then by a further 188,000 in July; if this additional crude materialises while export demand runs out of steam and refineries enter maintenance, Cushing can refill and the curve ease. The slight rebound of the last week of June points that way, without confirming it.

The second scenario is that of prolonged tension. As long as exports run at full tilt and refineries pull hard, the tanks stay scraping the floor. The market then lives with durable backwardation and an acute vulnerability: the slightest pipeline incident or the shutdown of a supply source could force a disorderly unwind of positions at expiry, a physical squeeze where holders of short contracts struggle to find crude to deliver.

The third scenario is the most interesting, because it comes from outside. We documented how China, the world’s largest importer, played the role of a price ceiling in 2026 by cutting its purchases and living off its record reserves, in our article on the Chinese inventory that caps prices. What happens if Beijing starts buying again? Its imports had fallen to 9.25 million barrels a day in April, a near-three-year low. A simple return toward normal would add one to two million barrels a day of demand to the world market. Brent would rise, the Brent-WTI spread would widen, and this more favourable spread would encourage even more US crude to be exported. The mechanics are counter-intuitive: a reviving Asian demand does not fill Cushing, it empties it a little more, by pulling US barrels toward the export terminals. A Chinese awakening would be bullish for the world price and tightening for the Oklahoma terminal.

The opposite reading

It remains not to overstate the signal. The serious objection lies in the very evolution of the US market. Since the United States became a major exporter, the benchmark crude price is increasingly set on the Gulf Coast, around Houston, where the export terminals concentrate, and less and less at Cushing. The marginal US barrel is a barrel that gets exported, priced in relation to world Brent, not a barrel sleeping in Oklahoma. In this reading, a floor at Cushing becomes a partly local phenomenon, a logistical bottleneck that inflates backwardation on the near-dated WTI maturities without necessarily saying much about the world oil balance.

This nuance has weight, and it invites not confusing a plumbing tension with a planetary shortage. It has its limits, however. Cushing remains the delivery point of the most traded contract in the world, and a delivery stress can trigger violent price moves that spill far beyond Oklahoma, as the 2020 episode showed. The terminal weighs less than before on the price level; it weighs as much as ever on its volatility at expiry. Following it closely, without making it say more than it says, remains the right discipline.

Sources

1. U.S. Energy Information Administration, weekly Cushing crude stocks excluding SPR, series W_EPC0_SAX_YCUOK_MBBL (31.5 Mb on 3 April, 18.96 Mb on 19 June, 19.67 Mb on 26 June 2026): https://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=PET&s=W_EPC0_SAX_YCUOK_MBBL&f=W
2. Kpler, “WTI flirts with physical squeeze as Cushing buffers evaporate” (10 June 2026), M1-M3 backwardation toward $7, US exports ~5.6 Mb/d, refineries at 95%, Houston-Cushing differential ~$1 against 4 a month earlier: https://www.kpler.com/blog/wti-flirts-with-physical-squeeze-as-cushing-buffers-evaporate
3. Energy News Beat / TankTerminals, “Cushing Oil Storage Hits Tank Bottom”, capacity ~76 Mb, level ~26%, definition of tank bottoms: https://tankterminals.com/news/cushing-oklahoma-oil-storage-hits-tank-bottom-implications-for-energy-markets-consumers-and-investors/
4. Transport Topics, “Oklahoma Crude Inventories in Cushing Fall Near Minimum”, lowest since October 2014, operating floor of about 20 Mb estimated by Wood Mackenzie: https://www.ttnews.com/articles/oklahoma-crude-cushing-low
5. l0g, “Oil: the Chinese inventory that caps prices”, Chinese imports at 9.25 Mb/d in April 2026, OPEC+ increase of 600,000 then 188,000 b/d: https://l0g.fr/en/analysis/oil-the-chinese-inventory-capping-prices/
6. l0g, guide “Reading the oil market” (paper vs physical, contango and backwardation, data calendar): https://l0g.fr/en/guides/read-oil-market/