Today, new and unexpected challenges arise for Europe’s large array of existing dams, and fresh perspectives on the development of new projects for supporting Europe’s energy transition have emerged. In this context, the 12th ICOLD European Club Symposium has been held in September 2023, in Interlaken, Switzerland. The overarching Symposium theme was on the "Role of dams and reservoirs in a successful energy transition". The articles gathered in the present book of proceedings cover the various themes developed during the Symposium:- Dams and reservoirs for hydropower- Dams and reservoirs for climate change adaptation- Impact mitigation of dams and reservoirs- How to deal with ageing damsIn conjunction with the Symposium, the 75th anniversary of the Swiss Committee on Dams offered an excellent opportunity to not only draw from the retrospective of Switzerland’s extensive history of dam development, but to also reveal perspectives on the new role of dams for a reliable and affordable energy transition. These aspects are illustrated by several articles covering the various activities, challenges, and concerns of the dam community.