So far in August, OPIS data shows Mont Belvieu propane prices have tumbled 11%, pressured by lower crude values, strong production, and steady export levels. In contrast, Conway, KS — the Midwest’s key propane hub — has slipped only 5%, as marketers scooped up lower-cost barrels to rebuild inventories ahead of the crop-drying season and winter heating demand.

As the left-hand graph illustrates, that divergence pushed Conway’s price to about a penny above Mont Belvieu on Friday — an unusual occurrence for August. Typically, Gulf Coast export demand keeps Mont Belvieu priced above Conway until Midwest winter demand takes hold. The right-hand graph shows the historical context: since 2019, the average monthly spread has been 2.6 c/gal (red dashed line), peaking at 16 c/gal in April of this year. In NGL trading circles, the Mont Belvieu–Conway spread is often referred to as the “widow-maker” for its tendency toward unexpected, often counter-seasonal volatility.

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