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Thermal Energy Storage for Cost-Effective Energy Management & CO2 Mitigation

  • Annex 30
  • Completed
  • Energy storage in energy systems


The main objective of Annex 30 is to encourage the implementation of thermal energy storage (TES) systems and evaluate their potential with respect to CO2 mitigation and cost-effective thermal energy management.

These overarching targets can be supported by the integration of thermal energy storage systems in order to

  • improve overall energy efficiency of the processes
  • increase process flexibility
  • increase utilization of renewable energy technologies (including solar thermal technologies as well as fluctuating power generation by PV and wind) and
  • boost energy system flexibility through peak shaving and demand response applications

The participants of Annex 30 have created a methodology that systematically analyses an integrated TES system by characterizing the process and TES system in isolation, then evaluating them together in an application. Specifically, the methodology proposes a set of process analysis guidelines, defines the different analysis levels of a TES system (i.e. system boundary) and provides definitions for important technical parameters of a TES system. For the overall application, the methodology identifies a set of key performance indicators (KPI) from the perspectives of different stakeholders.

This comprehensive approach has focused on four sectors: industrial processes, power plant applications, non-residential buildings and district heating and cooling. The methodology has been applied to various case studies originating from demonstration projects where TES systems are applied in a real environment. Industrial involvement is critical to this annex and the crucial goal of harmonizing research and industrial needs will be endeavored.


The work of Annex 30 has been published in a report titled Aplications of Thermal Energy Storage in the Energy Transition: Benchmarks and Developments.

The following are official publications of Annex 30:

Process Analysis Guidelines – May 2018
Definition of Analysis Levels of a TES system – May 2018
Definition of Technical Parameters for Thermal Energy Storage – May 2018

More information on Annex 30 can be found in the following:

Annex 30 Work Program – Version from November 2016
Annex 30 Introduction Presentation – April 2017 in Lleida, Spain

Workshops and Conferences

Kick – off Meeting
18 May 2015 – Beijing, China

1st Workshop 
29 – 30 October 2015 – Stockholm, Sweden

2nd Workshop and Joint Conference: Thermal Energy Storage – Perspectives and Applications in an Industrial Enviroment
2 – 4 May 2016 – Frankfurt am Main, Germany

3rd Workshop
17 – 19 October 2016 – Tokyo, Japan

4th Workshop and Spanish Conference
24 – 26 April 2017 – Lleida, Spain

5th Workshop and French Conference
17 – 19 October 2017 – Pau, France

6th Workshop 
1 – 2 March 2018 – Frankfurt am Main, Germany

Final Meeting
18 – 19 June 2018 – Cologne, Germany

Task agent(s)

No operating agent(s) listed


Annex 30 is completed. For requests and information, please contact the ECES TCP secretariat using the contactform below.

    Subtask leaders

    • German Aerospace Center (DLR)
    • Germany
    • KTH Royal Institute of Technology
    • Sweden
    • Tokyo Institute of Technology
    • Japan
    • University of Lleida
    • Spain
    • ZAE Bayern
    • Germany


    • Atomic Energy and Alternative Energies Commission (CEA)
    • France
    • Chalmers University of Technology
    • Sweden
    • Çukurova University
    • Turkey
    • Danish Technological Institute
    • Denmark
    • Energy Research Center of the Netherlands
    • The Netherlands
    • Energyville (KU Leuven & VITO)
    • Belgium
    • Italian National Research Council (CNR-ITAE)
    • Italy
    • Swedish Center for Shallow Geothermal Energy
    • Sweden
    • Technische Universität Chemnitz
    • Germany
    • University of Pau
    • France


    • Austrian Institute of Technology (AIT)
    • Austria
    • University of the Basque Country UPV-EHU
    • Spain