US spot polymer-grade propylene (PGP) prices are likely to increase into 2025, driven largely by several planned limitations on supply.
By mid-December, the US PGP market had the sharpest contango structure between the prompt month and the forward month since Argus began tracking data over 10 years ago. A contango is when the next month's price is higher than the current month's price. On 12 December, December-delivery PGP at the Enterprise Products Partners (EPC) system at Mont Belvieu, Texas, traded at 35.75¢/lb, while January-delivery PGP traded twice at 38.75¢/lb. Argus' PGP forward curve shows prices rising to over 40¢/lb by the second quarter of next year.
Many factors are behind this record 3¢/lb premium for January PGP and the continued increase into mid-year. The first is that spot prices have dipped to their lowest levels since August 2023 on a rare period of no major supply disruption at propane dehydrogenation (PDH) units, which produce on-purpose propylene. Most propylene production in the US comes as a byproduct from refineries or as a co-product from steam crackers. All four US Gulf coast PDH units have been operating without major incident or extended shutdown since the late summer. Since mid-August, only Enterprise's PDH-1 was shut, for two weeks in mid-October, but this was not enough to stop the downtrend in PGP's spot price. US spot PGP prices declined by 40pc from a 12 August near-term peak of 58¢/lb to a low of 35¢/lb on 9 December.
A second major factor behind the market's sharp contango is that PGP supply is set to tighten in 2025. Propylene supply will have a structural reduction when LyondellBasell's 264,000 b/d refinery in Houston begins shutting down units in January and completed closes by the end of the first quarter. The company sought to exit the refining business but could not find a buyer for the refinery, which produces 136,000 metric tonnes (t)/yr of propylene. There are no planned additions to US propylene capacity in 2025, and several US crackers that produce propylene as a co-product are set for turnarounds in the first quarter. Meanwhile, propylene demand is set to structurally rise in the second half of 2025, when Formosa's new 250,000 t/yr polypropylene plant in Point Comfort, Texas, is scheduled to come online.
A third major factor indicating that US spot PGP prices in December are the lowest they will be for at least several months is seasonality. One market participant said that spot activity to end 2024 is largely characterized by sellers destocking inventory ahead of the state of Texas' ad valorem taxes on inventories. This tends to cause seasonally lower prices in December and then a rise in prices in January as the market restocks inventory. This trend has persisted for the last four straight years.
These three major factors — uninterrupted supply to end 2024, supply tightening in 2025, and seasonal buying patterns — all stand behind the sharpest contango into the next year for propylene in 10 years of record keeping. The forward curve for PGP indicates a rise of 5¢/lb between now and the middle of next year.
The forward curve, though, does not account for any unplanned shutdowns of PDH units, which happen frequently as PDH units are operationally less reliable than propylene-producing crackers and refineries. In July, the US had three of its four PDH units shut down, taking 2.9mn t/yr of on-purpose propylene capacity offline. Such incidents could spike prices for PGP above the uptrend expected into next year.
