A slew of LPG, ethane and ethylene export projects are underway along the Gulf Coast, a direct result of rising U.S. NGL production and generally flat domestic demand. Three of the projects will provide “flex” capacity of some sort — that is, the facilities will be able to shift between LPG and ethane exports or, in some cases, between ethane and ethylene. In today’s RBN blog, we review the history of U.S. LPG and ethane exports, why midstreamers have been struggling to keep up with export capacity, and how the ongoing addition of flex capacity is likely to play out.