The lead project for the development of tomorrow’s district heating network.


The “ThermaFLEX” project deals with an increase in system flexibility and the resulting reductions in CO2 emissions in the district heating sector.

A quarter of Austria’s energy demand required for heating building space is provided by a network-based heat supply provided by more than 2,000 district heating systems. The district heating sector as well as local heating sector play, therefore, a central role in Austria’s energy supply. At the same time, district heating systems are also ideally suited for measures that increase flexibility within the energy system and enable the integration of renewable energy sources, the use of waste heat, of heat storage tanks, sector coupling, the active involvement of users, and new, efficient operating strategies. Thus, in the lead project “ThermaFLEX” and in its seven associated demonstration projects, flexibility measures in the district heating sector are identified. The aim is to create a sound basis for the selection and optimization of flexibility measures through simulation-supported planning, scientific evaluation methods, and detailed monitoring of specific applications.

The following demonstration projects are being implemented and scientifically accompanied as part of the lead project “ThermaFLEX”:

  • Virtual heating plant Gleisdorf – increasing the output of biogas
  • Spittelau waste incineration plant – use of latent energy from flue gas by means of a high-temperature heat pump
  • Conceptual design of the eco-energy park Salzburg-Süd – integration of low-temperature industrial heat
  • Low-carbon district heating for the city of Leibnitz
  • Heat recovery from waste water in Vienna-Liesing
  • Big Solar Salzburg
  • Energy Island Weiz – 100% renewable energy supply
Project consortium
Contact Project Management
DDI DDr. Stefano Coss
Wissenschaftlicher Projektleiter
Bereich: Thermische Energietechnologien und hybride Systeme
AEE - Institut für Nachhaltige Technologien
Feldgasse 19
8200 Gleisdorf

T: +43 (0)3112 5886-236
 Project Partners
  • BIOENERGY 2020+ GmbH
  • StadtLABOR Innovationen für urbane Lebensqualität GmbH
  • Technische Universität Graz – Institut für Wärmetechnik
  • Stadtwerke Gleisdorf GmbH
  • S.O.L.I.D. Gesellschaft für Solarinstallation und Design mbH
  • Technische Universität Wien – Institut für Energiesysteme und Elektrische Antriebe
  • Freistritzwerke-STEWEAG-GmbH
  • JOANNEUM RESEARCH Forschungsgesellschaft mbH
  • AIT Austrian Institute of Technology GmbH
  • Salzburg AG für Energie, Verkehr und Telekommunikation
  • Rotreat Abwasserreinigung GmbH
  • SIR – Salzburger Institut für Raumordnung und Wohnen
  • Alois Haselbacher GmbH
  • Energie Steiermark AG
  • Horn Consult
  • ENAS Energietechnik und Anlagenbau GmbH
  • Pink GmbH
  • GREENoneTEC Solarindustrie GmbH
  • STM Schweißtechnik Meitz eU
  • Green Tech Cluster Styria GmbH
  • FRIGOPOL Kälteanlagen GmbH
  • Abwasserverband Gleisdorfer Becken
  • Schneid GmbH
  • Nahwärme Tillmitsch GmbH & Co KG

Key project data
Duration November 2018 to Ocotber 2022
Funding programme Flagship region Energy
Project type Lead project and associated demonstration projects
Project budget € 4.6 Mio. (lead project)