And this is key to the finances... Waste material costs over €100/ton to dispose of across most of the EU. So therefore this material costs less than nothin

And this is key to the finances... Waste material costs over €100/ton to dispose of across most of the EU. So therefore this material costs less than nothing! That's why the project doesn't use water (which has a 4x higher heat capacity and can be pumped allowing the heat exchangers to be far smaller and eliminating the 'temperature decreases as it discharges' problem).