Thermal energy storage (TES) is subdivided into sensible, latent, and thermochemical heat & cold storage. In Task 48, TES materials for latent heat storage (phase change materials, PCM), for thermochemical heat storage (thermochemical materials, TCM), and for high-temperature sensible heat storage will be in focus. A variety of different materials is investigated and applied to be used as PCM and TCM in TES systems. New materials, material mixtures, and composites are worked on and presented by a growing community of experts.

The main goal of the proposed Task is to support TES materials R&D by

• developing measurement guidelines for material properties,
• providing an overview of new and innovative PCM and TCM as well as related synthesis and production methods,
• establishing a high-quality TES materials database, and
• disseminating lessons learnt from previous ES TCP Tasks on compact TES.

Task 48 is subdivided into four Subtasks. As a side activity, the experts will elaborate a plan how to organize a continuous activity for the TES materials R&D work.

If you are interested to join Task 48, please have a look at this intro presentation:

The Kickoff meeting took place at KTH in Stockholm, Sweden, from 13 to 15 October 2025.

The second experts meeting will take place at the University of Lleida, Spain, from 11 to 12 May 2026.

All experts meetings will be organized as shared meetings together with Task 47 (Thermal Energy Storage Components).