The State of Global Oil Reserves

Energy
Written By Don Bradford
The State of Global Oil Reserves — LodiEye

The State of Global Oil Reserves

LodiEye — May, 2026

A crisis-era inventory of what the United States, California, Europe, and Asia have on hand — in caverns, in tanks, and at sea.

Summary

When Iran closed the Strait of Hormuz in late February 2026 and the broader Middle East conflict followed, the world's oil-buffer infrastructure — the salt caverns, the harbor tanks, the bonded floating storage off Asian ports — stopped being a back-of-the-textbook curiosity and became the thing standing between functioning economies and rationing. This report inventories that buffer as of mid-May 2026 across four jurisdictions: the United States, California (which sits inside the United States but is functionally an island for fuel), Europe, and Asia.

The picture that emerges is uneven. China has spent five years quietly building the largest emergency stockpile in human history. Japan, South Korea, and the major European economies sit comfortably above their treaty obligations. The United States holds less than it did when the year began — the Strategic Petroleum Reserve has shed roughly 30 million barrels in eight weeks of coordinated and bilateral releases. India operates on a buffer measured in days, not months. And California — the most fuel-isolated populous market in the country — now reports between four and six weeks of gasoline and diesel cover under normal conditions, with no clear replacement for the Asian refined-product imports set to run out in mid-May

Key takeaways

  • China holds an estimated 1.4 billion barrels across government and commercial inventories — roughly 3.4 times the current U.S. Strategic Petroleum Reserve, and the largest single national position in the world.
  • The U.S. SPR stood at 384.1 million barrels the week of May 8, 2026, down from 415 million in early March, after the IEA-coordinated release and follow-on bilateral loans.
  • EU member states collectively hold roughly 800 million barrels of emergency crude and product stocks — equivalent to 85 to 90 days of net imports, in compliance with EU Directive 2009/119/EC.
  • Japan reports about 254 days of supply and South Korea about 210 days, the highest coverage ratios in major industrial economies.
  • California reports four to six weeks of fuel cover — the tightest position of any major U.S. consumption center, driven by 10-year-low inventories, the loss of Asian refined-product imports, and the Valero Benicia refinery shutdown completed in early May.
  • Roughly 1.2 billion barrels of crude oil sit on tankers in transit at any given time globally — the highest at-sea volume since 2016 — with an additional ~30 million barrels in genuine floating storage as of late April.

The global picture: 1.8 billion barrels of formal reserves, 1.2 billion on the water

The world's oil-buffer system has three layers. The first is formal strategic reserves — oil held by governments or government-controlled entities specifically to ride out supply shocks. The second is commercial inventory at refineries, terminals, and pipelines, which exists for ordinary operational reasons but functions as a shock absorber when needed. The third is oil in transit on tankers — a category that includes both genuinely moving cargo and barrels parked at sea for commercial or strategic reasons.

As of March 2026, International Energy Agency member states collectively held approximately 1.8 billion barrels in strategic reserves, of which roughly 1.2 billion barrels were government-controlled and the remainder held by industry under government obligation. On March 11, 2026, the IEA announced the largest coordinated release in its 51-year history: 400 million barrels drawn from the stockpiles of 32 member nations over a multi-month window, with the United States contributing 172 million barrels, and Japan, South Korea, France, Germany, and the United Kingdom contributing the bulk of the remainder. More than 30 additional non-IEA countries pledged supporting volumes.

Strategic crude oil inventories by holder, late 2025 / early 2026

Sources: U.S. EIA Today In Energy (April 2026), Kpler, Vortexa, Eurostat, ISPRL. China figure includes both government-held (~360 Mbbl) and commercial inventories (~1 Bbbl). U.S. SPR shown at December 2025 level.

Oil in transit and floating storage

The category often missed in reserve discussions is the floating layer. According to Vortexa data cited by Bloomberg, roughly 1.2 billion barrels of crude oil sit on oceangoing tankers at any given moment in 2026 — the highest at-sea volume since 2016. Most of this is genuine transit between producer and consumer, not storage. But a meaningful sub-category — floating storage proper — rose from under 25 million barrels in early April to roughly 30 million barrels by month's end as Middle Eastern cargoes lost their normal discharge ports. Diesel alone accounts for more than 15.5 million barrels of the seaborne stored volume, an unusual concentration that reflects the war's disruption of refined-product flows.

The chokepoint problem. The Strait of Hormuz normally carries about 20% of global crude flows. When Iran closed it on February 28, the world's seaborne tanker network effectively split in two: barrels were stranded inside the Gulf with no exit, while consuming regions outside it lost their primary supply lane. The 30 million barrels now in offshore floating storage is the visible signature of that split.

United States: a depleted reserve and a tight commercial system

The U.S. Strategic Petroleum Reserve, established in December 1975 after the Arab oil embargo, has an authorized storage capacity of 714 million barrels held in four salt-cavern complexes along the Texas and Louisiana coasts. Its all-time peak was 726.6 million barrels on December 27, 2009. It has not approached that level in this decade.

The SPR began 2026 at approximately 413 million barrels, climbed briefly to about 415 million in early March as small refill purchases preceded the crisis, and was drawn down to 409 million by April 10, 384.1 million by May 8, and continues to fall under an active release schedule. The U.S. Department of Energy announced on May 12, 2026 that it would loan an additional 53 million barrels to multiple energy companies on top of approximately 80 million already loaned this spring, fulfilling the U.S. portion of the 172-million-barrel international commitment.

U.S. Strategic Petroleum Reserve, recent trajectory

Sources: U.S. Energy Information Administration weekly stocks data, Department of Energy announcements. Authorized capacity at 714 Mbbl; historical peak (Dec 2009) at 726.6 Mbbl.

The SPR is not the entire U.S. buffer. The Energy Information Administration's Weekly Petroleum Status Report for the week ending May 8, 2026 placed U.S. commercial crude oil inventories — the working stock at refineries, terminals, and in pipelines — at 424.4 million barrels, about 4% below the five-year average for the season. Cushing, Oklahoma, the WTI delivery hub, held 27.4 million barrels. Total motor gasoline inventories sat slightly below five-year norms; distillate fuel inventories sat about 6% below.

The country also runs three small specialized reserves that are easy to forget: the Northeast Heating Oil Reserve, the Northeast Regional Refined Petroleum Product Reserve, and the State of New York's Strategic Fuels Reserve. None individually approaches 1% of national consumption, but they cover specific regional vulnerabilities that the SPR does not.

384.1M
SPR barrels, May 8, 2026
Down ~31M from early March; 54% of authorized capacity
424.4M
Commercial crude, May 8
4% below five-year seasonal average
133M
SPR loans committed, spring 2026
~80M dispatched + 53M announced May 12
$105.38
WTI spot, May 1, 2026
Up $45.71 year-over-year

The IEA's 90-day-of-net-imports rule applies to the United States too, but because U.S. net imports have fallen sharply since the shale revolution, the SPR at current levels still satisfies the obligation comfortably when industry stocks are added. The strategic concern is not compliance — it is depletion velocity. At the spring 2026 release rate, the SPR could fall below 350 million barrels before year-end if no refill occurs.

California: the most exposed major U.S. fuel market

California's fuel system is structurally different from the rest of the country. The state's roughly 850,000 to 900,000 barrels per day of gasoline demand — plus its national-leading jet fuel consumption and substantial diesel demand — is supplied almost entirely by in-state refineries running CARBOB-spec gasoline that nowhere else in the country produces. There are no meaningful pipelines from the Gulf Coast. The Jones Act constrains coastal tanker movements. And the state has historically held lower inventory ratios than the rest of PADD 5, let alone the national average.

That structure produces persistent vulnerability that the current crisis has exposed. The California Energy Commission confirmed in early May 2026 that the state has roughly four to six weeks of gasoline and diesel cover under normal conditions, with adequate jet fuel supply but no clear bridge after the Asian refined-product flows interrupted by the Hormuz closure run out in mid-May. The CEC expects imports to recover in June as global markets adjust, but did not publicly define the thresholds at which it would consider rationing or emergency rules.

The structural picture has worsened sharply over the past 18 months. Phillips 66 closed its 139,000-barrel-per-day Los Angeles refinery (the Wilmington and Carson complex) at the end of 2025. Chevron's El Segundo facility experienced an explosion and fire earlier in 2025. And in the most consequential single development, Valero ceased fuel production at its 145,000-barrel-per-day Benicia refinery in early May 2026, completing a phased idling that began in February under a plan first announced to the CEC in April 2025. The Benicia closure alone removed approximately 9% of in-state refining capacity; combined with the Phillips 66 Los Angeles shutdown, California has now lost roughly 17% of its refining capacity in under six months, leaving the state with seven remaining facilities capable of producing CARBOB-spec gasoline.

Valero Benicia — the timing. The Benicia refinery began phased unit shutdowns in February 2026, the same month Iran closed the Strait of Hormuz. Valero ceased fuel production entirely in early May, finalizing its exit just as the Asian refined-product imports that were supposed to backfill California's lost in-state capacity became unavailable for an unrelated reason. Valero has stated it will import additional gasoline volumes near-term to meet contractual supply obligations — meaning a former in-state producer is now a competitor in the same constrained global import market California is depending on for cover. Stanford SIEPR analysts projected the closure would widen the gap between in-state production (~760,000 bpd) and demand (~887,000 bpd) by an additional ~75,000 bpd, to roughly 195,000 bpd of structural import need. The Benicia site employed approximately 400 workers and accounted for an 8.94% share of state crude oil refining capacity per CEC listings. Valero recorded a combined $1.1 billion pre-tax impairment for its Benicia and Wilmington (Los Angeles County) operations in Q1 2025 ahead of the closure.

A bipartisan group of state legislators has pressed the CEC and the California Air Resources Board for transparent supply data, arguing that current opacity prevents both market planning and public accountability.

California refined-product inventories, recent reading

Source: California Energy Commission Weekly Fuels Watch reporting through April 2026. Combined diesel includes in-state CARB, non-California EPA-spec, and renewable diesel.

Where the math goes. California's daily gasoline demand of roughly 875,000 barrels means a 30-day inventory at current refined-product levels (~6.1 million barrels of CARBOB gasoline plus comparable distillate volumes) is not a comfortable cushion — it is the cushion. The 42% supply-chain figure being cited in industry analyses reflects the combined effect of recent in-state refining closures and halted Asian product flows, not in-state production losses alone.

The minimum-inventory law that has not yet produced a rule

In October 2024, Governor Newsom signed AB X2-1, empowering the California Energy Commission to set and enforce minimum inventory levels for refiners operating in the state. The law allows seasonal and regional adjustments and contemplates a tradable compliance mechanism similar to the Low Carbon Fuel Standard. As of May 2026, the CEC has not yet finalized the implementing rule. Consumer Watchdog and other advocacy groups have argued the agency is moving too slowly given the current threat environment; refiners and the American Fuel & Petrochemical Manufacturers have argued the mandate would raise everyday prices and reduce supply available to Arizona and Nevada, both of which depend on California refining throughput. Both arguments have empirical merit.

Europe: a 90-day floor and the largest coordinated stockpile system in the world

European Union member states operate under Council Directive 2009/119/EC, which requires each country to maintain emergency stocks equal to at least 90 days of average daily net imports or 61 days of average daily inland consumption — whichever is greater. The directive is unusually well-enforced relative to other multilateral obligations: countries file monthly statistical summaries with the Commission, and emergency drawdowns require prior consultation except in genuinely urgent situations.

As of the most recent Eurostat reading, the EU collectively held 108.6 million tonnes of emergency oil stocks — approximately 800 million barrels — up 7.3% from the June 2022 low. The composition was 43.5 million tonnes of crude oil, 39 million tonnes of gas/diesel oil, and 10.4 million tonnes of gasoline. The European Commission confirmed in early March 2026 that all member states held between 85 and 90 days of stocks and that no member state had notified Brussels of an emergency release tied to the Middle East conflict.

Top EU emergency oil stock holders

Source: European Commission data cited in Euronews reporting, April 2026. Belgium, Luxembourg, and Malta hold substantial reserves in other member states' facilities under cross-border storage arrangements.

The EU contributed 92 million barrels — nearly a quarter — of the 400-million-barrel IEA coordinated release, with 20 of the 27 member states participating. Analysts estimated the contributed volume alone would cover roughly five months of the EU's incremental need at crisis-elevated consumption rates. Finland, Greece, and Sweden traditionally report the highest coverage ratios in days-equivalent terms; Ireland, Bulgaria, and Latvia run nearest the 90-day floor.

The non-EU European holdings

The United Kingdom maintains separate strategic stocks under post-Brexit arrangements but participates in IEA coordination and contributed to the March release. Switzerland, Norway (a net exporter and therefore not required to hold reserves), and Moldova — which is currently building its first formal strategic reserve, with a target of 90 days by 2030 — round out the European picture. Moldova reports current diesel stocks equivalent to 18 to 20 days and gasoline stocks above 20 days, illustrating the gap between formal reserve programs and the kind of buffer the EU directive ensures.

Asia: Chinese dominance, Japanese discipline, Indian exposure

Asia contains both the world's largest reserve holder and one of its smallest among major consumers. The contrast is instructive about what strategic preparation actually looks like in practice.

China

The People's Republic of China is now estimated to hold approximately 1.4 billion barrels in combined government and commercial crude inventories — the largest national oil position in the world, exceeding the United States' SPR plus commercial inventories combined. The U.S. EIA estimates government-held inventories at approximately 360 million barrels (similar to the current U.S. SPR) and commercial inventories at approximately 1 billion barrels (compared with 411 million held commercially in the United States). Beijing does not publish official inventory data; estimates are constructed from imports, exports, refinery throughput, and third-party satellite-based tank-monitoring services including Kpler, Vortexa, and Kayrros.

China added an average of 1.1 million barrels per day to strategic and commercial inventories through 2025, at a pace that continued into early 2026 before the Iran conflict. State-owned majors are constructing 11 new storage sites across 2025 and 2026 totaling approximately 169 million barrels of additional capacity — a building rate comparable to the entire 2020-2024 cumulative addition. Council on Foreign Relations analysis suggests the current Chinese position represents roughly four months of seaborne import cover at 2025 average rates, materially insulating China from the Hormuz-related disruption that has hit Japan, South Korea, India, and Europe harder.

Japan and South Korea

Japan holds approximately 263 million barrels in government-controlled inventories as of December 2025, with total onshore crude inventories (government plus commercial, including statutorily mandated industry stocks) at approximately 350 million barrels. At 2025 average refinery throughput rates of 2.4 million barrels per day, this represents roughly 150 days of supply at full activity, or 182 days if exports are suspended and only domestic transportation fuel demand is served. Government reports place the official coverage figure at 254 days of supply — the highest among major industrial economies.

South Korea reports approximately 210 days of supply, holding 79 million barrels in government strategic stocks plus mandatory industry holdings of 40 to 60 days of import or production. Korea also operates international joint stockpiling arrangements that lease storage to Saudi Arabia, the UAE, and Kuwait, giving the country call-rights on additional volumes in genuine emergencies. Both Japan and South Korea contributed materially to the IEA coordinated release.

India

India operates the most exposed strategic position of any major economy. The Indian Strategic Petroleum Reserve, run by ISPRL, held 21.4 million barrels of crude as of March 2025 — sufficient for roughly 10 to 14 days of net imports at current consumption rates. An additional 3 million barrels at Mangalore are held under a commercial arrangement with ADNOC of the UAE and are not formally part of the Indian reserve. India has been exploring overseas storage leases, including discussions with Oman about a 5-million-barrel position, but no second-phase facilities are operational. The country imports roughly 60% of its crude from Middle Eastern suppliers, the highest dependency ratio in major Asia.

Other Asian and Middle Eastern positions

Country / region Strategic inventory (Dec 2025) Notes
China (govt + commercial) ~1,400 Mb Largest national position; building 11 new sites through 2026
United States (SPR) 413 Mb → 384 Mb December 2025 vs. May 8, 2026
Japan (govt only) 263 Mb 350 Mb total onshore including industry mandatory holdings
OECD Europe (govt) ~179 Mb Subset of full EU emergency stocks total ~800 Mb
Saudi Arabia (on-land) ~82 Mb Excludes leased capacity in S. Korea, Japan, India
South Korea (govt) 79 Mb 210 days of supply reported when industry mandatory included
Iran (on-land) ~71 Mb Bonded storage in China at unknown level
UAE (on-land) ~34 Mb Underground Fujairah capacity not disclosed
India (ISPRL) 21.4 Mb ~10-14 days of net imports

Days of supply coverage, major economies

Sources: Government reporting and analyst estimates. Japan and South Korea figures include statutorily mandated commercial inventories. China figure reflects four-month seaborne import cover estimate from Council on Foreign Relations analysis. India figure reflects ISPRL strategic reserve only.

What it all means

The reserve system was designed for short, sharp shocks — a hurricane closing Gulf platforms, a war interrupting one producer's exports for weeks or months. The 1973 Arab embargo, which prompted the creation of the SPR and the IEA stockholding regime, lasted about six months. The 1990-1991 Gulf War oil crisis lasted weeks. Both Russian-invasion-related releases in 2022 covered periods measured in months.

The current Middle East conflict is now in its third month with no resolution visible. The 400-million-barrel IEA release, by far the largest in the system's history, equates to roughly four days of global oil consumption. Even drawn down over six months, it adds about 2 million barrels per day to global supply — meaningful, but smaller than the 12-million-barrel-per-day disruption analysts have estimated for the Hormuz closure. The reserves can buy time. They cannot replace production.

The differentiation across jurisdictions matters more than the totals. China's accumulation, much of it built quietly during a period of low prices in 2024 and 2025, looks in retrospect like the most consequential single piece of energy planning in the past decade. Japan's and South Korea's mandatory industry-holding regimes mean those countries can operate normally for the better part of a year even with import flows interrupted. The EU's 90-day directive, often criticized as expensive in normal times, is currently doing exactly what it was designed to do. The United States retains a substantial absolute position but has reduced flexibility relative to where the SPR sat a half-decade ago. India operates without meaningful margin. And California, structurally separated from the national supply network it nominally belongs to, runs the tightest position among major U.S. consumption centers and depends on the CEC and the legislature to define, finally, what minimum-inventory rules will look like in practice.

The reserves answered the question this winter. The remaining question is what happens between now and the next time the question is asked.

LodiEye is the investigative research arm of Lodi411.com, a citizen-run civic data and transparency platform serving Lodi, California and San Joaquin County. LodiEye is not a traditional news outlet. It does not employ professional journalists or reporters, and the people behind it do not hold journalism degrees or have professional newsroom experience. LodiEye is best understood as civic research and analysis — not peer journalism — and is not a substitute for the local and regional news organizations that do this work professionally. For traditional reporting on Lodi, San Joaquin County, and the broader region, readers are encouraged to consult the Lodi News-Sentinel, Stocktonia, The Sacramento Bee, CalMatters, and other established news outlets staffed by credentialed journalists.

This LodiEye analysis on global oil reserves was produced using artificial intelligence tools under the direction and review of the founder. Lodi411 uses multiple AI platforms in its research and publication workflow, including Anthropic's Claude (primarily Opus and Sonnet models) and Perplexity AI across a variety of large language models offered by each. These tools were used in the following capacities:

Source Discovery: AI-assisted search and retrieval identified roughly 25 primary and secondary sources spanning U.S. and international government statistical agencies (EIA, DOE, CEC, Eurostat, European Commission, IEA), market-intelligence providers (Kpler, Vortexa, Argus Media), policy research organizations (Council on Foreign Relations, Atlantic Council, Stanford SIEPR), trade press, and major newswire reporting. Perplexity AI was used for real-time data retrieval on rapidly evolving figures (SPR weekly stocks, refinery operating status, IEA release announcements); Claude was used for deeper analysis and synthesis across the assembled material.

Credibility Validation: AI cross-referenced inventory figures across multiple independent sources, prioritizing government datasets (EIA, Eurostat, IEA, CEC) and direct corporate disclosures (Valero, U.S. DOE) over secondary reporting. Where estimates rather than reported figures were used — particularly for China, Iran, Saudi Arabia, and the UAE strategic inventories — the source basis was identified and flagged in chart notes and inline text. Multiple models independently verified key data points including the SPR weekly figure, the Valero Benicia closure status, and the composition of the 400-million-barrel IEA coordinated release.

Analysis and Synthesis: Claude assisted in framing the three-layer buffer model (formal strategic reserves, commercial inventory, in-transit oil), developing the days-of-supply comparison framework across major economies, and identifying the timing convergence between the Valero Benicia idling and the Strait of Hormuz closure as the central California vulnerability of the current crisis window.

Presentation: Claude assisted in drafting prose, structuring the report by jurisdiction, designing the inline Kendo UI data visualizations using the standard six-color LodiEye palette, and constructing the comparative country-position table.

Final Review: Multiple AI models reviewed the completed draft for factual consistency, source attribution accuracy, and logical coherence. Multi-tool cross-checking is the primary error-reduction mechanism; errors can still arise from AI hallucination, source-data limitations (particularly for non-transparent jurisdictions like China and Iran), or oversight during human review, and the corrections invitation below exists so readers can flag any that slip through.

Lodi411/LodiEye believes transparency about AI use serves both readers and the broader information ecosystem. Readers who spot errors are encouraged to write editor@lodi411.com so corrections can be made.

References

Don Bradford
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