Saarland Heat Map

- Development of a comprehensive heat map for the Saarland

In light of the demographic changes, the municipalities of the Saarland will have to contend with new public service challenges in the future, including:

  • an increase in vacancy rates of buildings
  • decline of town centres due to demographic and economic changes
  • soil sealing in outlying areas
  • underusage of infrastructure

These developments will have dramatic consequences in the supply of heat in particular – especially if, in the future, the decreasing population trend is accompanied by a growing demand for more space per inhabitant and possibly rising costs for the supply of heat. According to the German Federal Statistical Office, the price for district heating, for example, has risen for households by 40% during the last ten years, from 6.5 cent/kWh to over 9 cent/kWh. At the same time, the rate of renovation for detached and semi-detached homes is on average currently just 1.3% annually.

Furthermore, only 13.2% of the heating energy supplied in Germany is regenerative heat, while, by contrast, electricity generated from renewables, for example, already makes up 32.6% of the total electricity consumption (Working Group on Renewable Energy Statistics, 2015). Therefore, a great need of transition to heat from renewables is needed in Germany. Local commercial and industrial companies, in particular, will play an important role in the future as heat sinks and/or as heat sources by providing their waste heat. New ways must be found to ensure a heat supply, which is of a high quality, secure, economic and socially accepted. Within this spirit, the Saarland Ministry of Economy, Labour, Energy and Transport is officially launching the transition to heat from renewables in the Saarland with this project.

The aim of the project is to provide a first important impetus for the transition to heat from renewables in the Saarland by creating a digital heat map covering the entire Saarland. By comprehensively mapping of existing heat sinks (e.g. households, municipal properties and companies) and overlaying potential sources of heat (industrial waste heat, solar thermal heat and bioenergy) 50 economically viable flagship projects in the Saarland shall be identified. These projects will demonstrate the feasibility of the heat transition and going to be implemented in cooperation with local stakeholder in cities and communities as well as the Saarland energy industry


Work Steps

  • Determination of settlement structures
  • Determination of heat demands
  • Spatial analysis and display of heat densities
  • Assessment of future development of heat demand
  • Integration of additional heat sources and sinks
  • Highlighting of the heat consumption structures
  • Identification of 50 flagship projects
  • Deduction of possible course of actions
  • Launch of initial flagship projects
  • Development of an IT applications



  • 01. April 2016 Start of the project
  • 25. April 2016 Projek start together with the customer
  • 25. April 2017: The Saarland Heat Map goes online!
    >> News (click here!)                     


  • Presentation "Projekt: Wärmekataster Saarland. Vorstellung der Projektergebnisse im Rahmen der 15. Kommunalbörse", 25.04.2017, Saarbrücken
    >> PDF  
  • "Wärmekataster Saarland", Final report
    >> PDF  


On behalf of


04/2016 to 11/2016