In 2024, the four German TSOs (4GTSO) - 50Hertz Transmission GmbH, Amprion GmbH, TenneT TSO GmbH and TransnetBW GmbH - jointly concluded contracts, following an EU-wide procurement process, for the research and development of 525 kV Bipole HVDC single-vendor Multiterminal systems. This technology allows the flexible interconnection of multiple HVDC lines, so-called DC-Hub projects. Following this approach, the 4GTSOs are now aiming to take the next step in advancing the technology by transitioning from a single-vendor to a multi-vendor setup. As an initial step, the 4GTSOs intend to conduct a gap analysis as part of this market consultation to identify key blocking points related to this transition and to gather the market’s perspective. To this end, the 4GTSOs have developed a structured questionnaire. For further information, please refer to the questionnaire, which can be accessed via the following link: https://eliagroup.sharepoint.com/:b:/s/EFSS/EFSS/IQB6sARohhDwT56bMNlq6H3-ASgbMD65Kyk4QeUU5v_fpGw?e=DNOdsh We kindly ask you to provide your written feedback by 31st August 2026. Please submit your response via email to benjamin.kirchner@50hertz.com.