Fast-rising NGL supplies during the early years of the Shale Era fueled excitement about the potential for new petrochemical plants in the U.S., especially ethane-only crackers to make ethylene and other byproducts, along with propane dehydrogenation (PDH) plants to make propylene. While 11 new ethane-fed crackers have come online in the U.S. since the mid-2010s and the world’s largest — Chevron Phillips Chemical and QatarEnergy’s 4.8-billion-lb/year facility — is under construction in Texas, only three of the many PDH projects proposed over the same period were actually built. In today’s RBN blog, we’ll look at why the initial rush of new PDH project announcements resulted in so few new U.S. plants.