The EIA reported a propane/propylene inventory build of 421 Mbbl for the week ended May 15, coming in well below both industry expectations for a 1.8-MMbbl build and the average build for the week of 1.7 MMbbl. Total U.S. propane/propylene inventories now stand at 81.6 MMbbl, which is 28.5 MMbbl, or 54%, above the same week in 2025, 14.9 MMbbl, or 22%, above the five-year maximum, and 26.6 MMbbl, or 48%, above the five-year average. Despite historically elevated inventory levels, the smaller-than-expected weekly inventory increase may suggest storage growth is beginning to moderate.
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