European Spallation Source, ESS, will be a multi-disciplinary research facility based on the world’s most powerful neutron source. The main facility is under construction in Lund, Sweden, with a Data Management and Software Centre in Copenhagen, Denmark, at an investment cost of 1.8 B€. Construction started in 2014. The machine is planned to be ready for first commissioning in 2019 and the user programme for researchers will begin in 2023. The European Spallation Source ERIC (European Research Infrastructure Consortium) was established in August 2015 and has 15 member- and observer countries.