U.S. refineries have been running at very high rates in 2026

U.S. refinery utilization averaged more than 95% of capacity from May through September, the highest rate for those months since 1998. Tight global product supplies boosted petroleum refining margins, particularly for diesel, encouraging higher refinery run rates.

Analysis

The key signal is not high throughput itself, but how little spare capacity remains to respond if a refinery outage or renewed product-supply disruption occurs. That can keep diesel cracks unusually sensitive to incremental shocks in the near term. Conversely, higher runs are already a supply response: if inventories rebuild, the same throughput that supports volumes can accelerate crack-spread normalization. Refinery utilization alone does not establish earnings upside; realized margins also depend on crude differentials, product mix, operating costs and each refiner’s ability to capture export economics.

Over the next 1–3 months, watch diesel cracks, product inventories, exports and unplanned outages—not utilization in isolation. Seasonal demand easing or inventory builds would challenge the tightness narrative. Over 6–18 months, sustained high utilization could defer maintenance or leave less operating slack, but there is not enough evidence here to assume a deterioration in reliability. The consensus risk is extrapolating strong margins into durable earnings growth despite limited room for further utilization gains. Without current valuations and company-level margin data, this is a conditional spread setup, not a basis for chasing refinery equities.

Key Decisions for Investors

• Do not add broad U.S. refiner exposure solely on the utilization data. For Valero, Marathon Petroleum and Phillips 66, verify realized refining margins, product mix and guidance before treating high runs as earnings upside.
• Conditional trade: consider a long NY Harbor ULSD-versus-WTI crack-spread position only if subsequent inventory data show draws and export demand remains firm. The thesis is falsified by sustained product-inventory builds or a material decline in diesel cracks; size for sharp reversal risk as supply responds.
• Track refinery outages and maintenance announcements as near-term catalysts: with limited spare capacity, disruptions could tighten products quickly. Reduce the tightness view if utilization falls alongside easing cracks and rebuilding inventories, rather than interpreting lower runs alone as bullish.