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Viewpoint: US ethane supply poised for further growth

  • : LPG
  • 22/12/20

US ethane supply is expected to rise in 2023 following high levels of ethane recovery from gas processing and reduced petrochemical demand for the feedstock in 2022.

Ethane recovery levels in the Permian basin in Texas and New Mexico reached maximum levels starting in the fourth quarter of 2022 after natural gas prices at the Waha hub in West Texas fell due to constrained takeaway capacity. Waha prices fell as low as -$0.565/mn Btu in October and averaged $3.09/mn Btu in the fourth quarter, creating an incentive for increased ethane recovery.

Mont Belvieu, Texas, EPC ethane prices have averaged 39.75¢/USG in the fourth quarter through mid-December. Ethane's premium to its fuel value relative to natural gas at the Waha hub averaged 19.39¢/USG in that time and rose as high as 43.79¢/USG when Waha prices were at their lowest.

Permian basin ethane rejection levels stand at 50,000-75,000 b/d according to estimates from midstream company Enterprise Products, a sharp decline from the 200,000-250,000 b/d of rejection the company estimated in August, when natural gas prices were higher.

Waha is projected to have continued takeaway constraints in 2023, maintaining a favorable spread for ethane recovery throughout the year and causing ethane supplies at Mont Belvieu to build. The US Energy Information Administration (EIA) forecasts that ethane production will average 2.61mn b/d in 2023, up by 7.85pc from 2022 levels, as natural gas production grows.

Petchem demand disappoints

The EIA initially estimated that ethane production would grow to meet increased demand from three new steam crackers that came online in 2022, but petrochemical demand for the feedstock was lackluster in the second half of the year and shows no sign of improving going into 2023. Petrochemical demand for ethane has abated as ongoing downstream supply chain issues have created a backlog of ethylene.

EPC ethane's spread to its fuel value at the Henry Hub has averaged a discount of 1.20¢/USG in the fourth quarter, as declines in ethane prices outpace losses in Nymex natural gas prices.

Most US ethylene crackers are configured to use ethane because it is the most cost-effective option compared to propane, butane, and naphtha, which can rise with higher crude prices. But cracking margins for US ethane narrowed in the second half of 2022 and even fell into negative territory, according to Argus modeling, as ethylene stocks grew. In the fourth quarter, ethylene cracker margins for ethane averaged $52.78/t, up from an average of $17.66/t in the third quarter, but still well below year-earlier margins of $397.74/t.

US ethylene producers have cut run rates to under 80pc of utilization since the third quarter because of the narrower margins, and they expect to continue operating at reduced rates going into 2023. Because of elevated ethylene inventories and narrow cash margins, there is no incentive for steam crackers to increase operating rates. The increase in supply has made ethane prices less volatile and the outlook for cracker margins relatively stable. Should ethylene demand increase or ethane prices decrease, causing margins to widen, producers will begin to ramp up ethylene production again in 2023.

Internationally, petrochemical demand for ethane is expected to grow in 2023. The EIA projects 460,000 b/d in US exports in the coming year as international petrochemical producers seek a cheaper alternative to heavier feedstocks, allowing exporters like Enterprise and Energy Transfer to expand term contracts.


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