Contents 02Executive summary 04Introduction 08The need for a Hydrogen Act 12The hydrogen infrastructure transition roadmap15 Building hydrogen valleys with regional and local hydrogen infrastructure (2021-2035)16 Building a pan-European hydrogen backbone infrastructure (2021-2035)18 Blending hydrogen with natural gas (2021-2035)19 Completing the hydrogen infrastructure (2035-2050)21Overview of the gas infrastructure transition roadmap (2021-2050)