European steam cracker feedstock transitions have been primarily driven by an attempt to increase ethylene cost competitiveness. Some specific cases for ethane have been driven to secure feedstock supply. These projects have also had a consequential impact on propylene supply in the region. On average, steam cracker feedstocks in Europe have and continue to get lighter. This insight explores how this has impacted overall propylene supply across the European region. Due to this effect of declining production and robust demand, a widening supply gap for propylene is emerging in Europe. INEOS and Borealis are both studying investments in propane dehydrogenation (PDH) projects with FID expected for both projects during 2018. The insight explores our latest understanding of the status and key drivers behind each project.