Prices for propane and butane fell back to August levels last week at both Mont Belvieu, Texas, and Conway, Kan., hubs.

En*Vantage surmised that stabilized Asian markets for propane, coupled with a surge of imports on the East Coast could have trimmed domestic demand and led to a lower-than-expected withdrawal from storage.

The price shift in the U.S. comes as Asian propane cracking economics have improved. That creates an opening in the market for U.S. exporters and En*Vantage is seeing some Asian petrochemical companies seeking cargoes.