This study tries to answer two fundamental questions related to the introduction of hydrogen in the Netherlands’ energy system in the period until 2030: what is the likely order of magnitude of electrolyser capacity investment in the Netherlands and what are their main drivers; and given such investment, and given the different sizes of electrolyser installations (varying from a scale of some MWs to GW-scale), where will those investments most likely be located and what are the most likely drivers of the choices of location? Both questions are highly relevant for the TSO and DSO’s responsible for hydrogen transport. The more hydrogen will be produced domestically as opposed to imported via the main harbours, the more transport capacity will need to be developed to service the market. The better the understanding of where hydrogen production will most likely be concentrated, the better the TSO but the DSO’s in particular will be able to plan their future hydrogen related transport capacities. Magnitude of electrolyser capacity investment So far virtually all investment in electrolyser capacity has been characterized by a spirit of pilot and demonstration activity. The commercial exploitation of electrolysers still is something of the future given the current stage of scaling up and learning. This means that serious investment in electrolyser capacity will not come off the ground without public support, either by way of subsidies or by way of command and control via prescribing the introduction clean hydrogen to replace grey hydrogen. In assessing what the main drivers are for investment in electrolyser capacity, public support therefore clearly will be the main factor, at least in the period considered i.e. until 2030. In the Netherlands support policies to stimulate hydrogen value chain development and electrolyser investment in the country have come off the ground fairly intensively during the last years: the Netherlands is the first country in Europe to invest in a national hydrogen backbone linking most of ...