In D2Grids 14 partners cooperate to introduce a new paradigm to create completely sustainable and circular heat grids, 5G district heating and cooling. Besides, the partners are working to demonstrate this new concept in 5 pilot sites across, The Netherlands, France, Germany and the UK. With the 5G heat grid design principles and most Key Performance Indicators (KPI’s), quantifying each of the design principles, established, the pilots can be assessed accordingly.