The quality of the assessment carried out in the TYNDP depends on the availability, consistency and quality of the collected data. Collecting the data to assess infra- structure projects has been particularly challenging as there are a wide variety of promoters and stakeholders involved which are very different in their features. The TEN-E Regulation puts an obligation on PCI candidate project promoters to submit their projects to ENTSOG for inclusion in the TYNDP. This goes with an additional responsibility for ENTSOG to put in place an adequate process to collect this data. Only projects actively submitted by promoters through the ENTSOG Data Portal have been considered in this edition of the TYNDP. This process ensures transparency and non-discrimination between projects. The additional data required for the PCI selection process and the necessity to track projects from one TYNDP edition to the next one led ENTSOG to put in place the Data Portal, a permanent online portal open to all project promoters. This tool to- gether with the close cooperation with the European Commission has ensured that all possible candidates for gaining or maintaining PCI status have been included in the TYNDP. ENTSOG endeavours to improve the collection process and welcomes stakeholder feedback. The information supplied in this report is up-to-date as of 12 September 2014.