Researchers from Europe and USA are working together to find solutions to challenges that arise in energy systems as we transition towards a zero-emission energy system, with a particular focus on the roles and opportunities of hydropower. The work from the project HydroFai was recently summed up in a workshop where experts from Argonne and Pacific North-West national laboratories and HydroCen, along with industry experts, presented information about developments in electricity market designs in Europe and the United States.