U.S. propane inventories took off like a rocket in May.  As shown on the left-hand chart below, total U.S. propane/propylene inventories increased by about 12.5 million barrels for the 4-week period in May 2023 (red bar), which is ~5 million barrels more than the average increase for the period (green bar).  The build was the largest on record for the month according to available historical EIA data.  The right-hand chart below shows the monthly propane EIA inventory data for May 2011 – 2022 and our estimate for May 2023.   Once again, May 2023 (red bar) comes out on top with the largest build.  As you might expect the primary culprit driving inventories up is lower exports.  Total U.S. exports in May were down 97 Mb/d from April and 57 Mb/d below the 2023 year-to-date average.  However, exports during the month were still 160 Mb/d higher than in May 2022 while gas plant production was only up about 110 Mb/d year-on-year.   So why is the build this year so much larger than last May?  Part of the increase in inventories is likely due to lower domestic demand.  But we believe the main reason is higher production and that the EIA weekly data is understating gas plant supply.    

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