Replacing natural gas by hydrogen in the existing DSO infrastructure will give several challenges on the security of supply of energy to the end-users, related to the physical aspects of the assets in the hydrogen network. Within the HyDelta2 program, WP8 Digitalization, the need and benefit of digitalization of the gas grid has been investigated. In the current gas grid the digitalization is limited in all aspects: monitoring, modelling and control. This means that a lot of digitalization aspects could be developed to handle the needs of a future hydrogen grid, which have to deal with the following trends: increasing dynamics in supply and demand, from a stand-alone grid to a multi-connected grid and a need for real-time data on supply and demand. A roadmap has been developed on how to deal with the main challenges in balancing the future hydrogen grid, for all aspects of digitalization. In the frame of the HyDelta2 program we have chosen for the use case ‘Smart sensor placement’ for pressure and flow sensors in the Kapelle area, which covers the main digitalization aspects, with a focus on the short- and mid-term. On this grid several scenarios have been applied, using TNO’s dynamic gas grid simulation tool Aurora. Starting with a base case where natural gas is replaced by hydrogen. Subsequently scenarios have been simulated on adding new supply locations for electrolyzers with a dynamic profile, adding large consumers and a scenario with one ‘broken gas pipe’. The flow and pressure in the whole grid has been simulated for all scenario’s, with realistic supply and demand data. The gas grid simulator has been validated in the current (natural gas) situation by available pressure and flow data. By replacing the natural gas by hydrogen and maintaining the delivery of the same amount of energy to all users, the flows in the grid are about three times higher and the pressures will remain about the same. However, the flows stay below the allowable limits. In the case of adding two realistic electrolyzers with a ...