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Date: Wednesday, January 20, 2021 Time: 10:00 a.m. to 12:00 p.m. Event: Online conference (Webex) Organizer: IKzB in Efficiency House Plus, Fasanenstrasse 87a, 10623 Berlin There are many different approaches to shaping the energy transition. The use of ice storage for renewable heat supply is proving to be promising. Initial long-term experience makes ice storage technology in combination with a heat pump appear to be a pioneering concept. Ice storage is a low-temperature heat storage system that can be operated with a heat pump and uses the crystallization heat of the ice. The ice storage concept is particularly suitable for planning large seasonal heat storage systems. Conventional hot water storage systems (or heating buffer storage systems), which are installed outside the building due to their size, require complex thermal insulation. The concept of near-surface ice storage is completely different. The low temperature level of the storage tank is not sufficient for direct use, but the heat can be extracted with the help of a heat pump for central heating and hot water. After formulating the technical principles for planning and construction, this online seminar follows the operational experience with ice storage systems using examples from neighborhood and educational buildings. First, the operational experience with ice storage systems and the supply of 1,000 residential units in combination with various large heat pump systems in Hamburg-Wilstorf is presented. The final article presents the new building of the Luise-Otto-Peters School, as an Efficiency House Plus in Hockenheim (2018). The additional effort involved in planning, building and operating an ice storage system is also discussed as an example. Title music: www.musicfox.com