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US ethane cracking margins fall on ethylene release

  • Mercados: LPG, Petrochemicals
  • 29/09/26

US ethane cracking margins declined in recent days after producers released more ethylene into the market, increasing supply and pushing prices lower.

Large volumes of EPC ethylene were sold last week for delivery in November and December, not just the typical prompt month. Market sources told Argus this unusual forward selling was linked to the delayed startup of Chevron Phillips Chemical's new 1mn t/yr polyethylene unit in Orange, Texas, that market participants expected in August.

Higher ethylene output and weaker downstream demand reduced margins. US ethane cracking margins fell to 9.51¢/lb on 25 September and stood at 9.5¢/lb at market close on 28 September, according to Argus's generic model tracking daily ethylene and ethane spot prices. Margins largely held steady between 12.5-13.5¢/lb throughout August and September. This rangebound performance reflected the narrow trading of US spot ethylene since late July.

In August and September, US spot ethylene at the Enterprise Products Partners cavern in Mont Belvieu, Texas, was assessed between 24.375¢/lb and 25.5625¢/lb. Stability around 25¢/lb followed a surge in US ethylene exports in April and May, driven by the Iran conflict, which pushed prices to a yearly high of 36¢/lb. Ethane cracking margins also peaked at 27¢/lb during this period. After a sharp decline, ethylene spot prices stabilized in June and July, settling around 25¢/lb for the past two months. No significant news or events moved spot EPC prices away from 25¢/lb in August or September.

The heavy forward selling for November and December EPC ethylene last week drove front month prices lower, with the forward curve remaining flat to slightly contango through 2026. The front month slipped out of its 24.5-25.5¢/lb range, with Argus recording 12 deals for September EPC delivery between 23.5-24.5¢/lb. October delivery had five deals between 23-24¢/lb. November EPC had 14 deals between 22.5-24.75¢/lb, surpassing September in volume, while December had 13 deals between 24-24.125¢/lb, just under September's total.

Chevron Phillips Chemical's new PE unit, part of the Golden Triangle Polymer Company joint venture with QatarEnergy, was expected to start in August but has yet to come online. The related 2.08mn t/yr ethane cracker is scheduled for early 2027. With the PE startup now closer to the cracker's launch, the company likely needs less stored ethylene and is avoiding ad valorem taxes on inventories due by year-end. CP Chem did not respond to a request for comment.

As US ethylene prices slid to 22.5¢/lb at week's end, US ethane cash costs hit a seven-month high, following gains in natural gas. Mont Belvieu EPC ethane rose to 27¢/USG on 24 September, the highest since January, as Henry Hub day-ahead natural gas prices remained at $3/mnBtu. Henry Hub spot prices reached a two-month high of $3.0525/mnBtu last week, as hot weather led to smaller-than-expected storage injections.

Kpler data showed US ethane exports hit a record 1.4mn tons, or 810,000 b/d, in August, with roughly 80pc shipped to China, where higher naphtha prices due to the US-Iran conflict prompted buyers to favor ethane. No decline is expected for September.

With US ethylene spot prices at three-month lows and ethane cash costs at seven-month highs, US ethane cracking margins are narrowing. Ethane remains the most economically viable feedstock. Even compressed margins under 10¢/lb for ethane outperform propane and butane, whose prices are more closely tied to crude oil. Propane and butane cracking margins are negative, at -1¢/lb and -12¢/lb, respectively, according to Argus's model.


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