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The article points out that it doesn't actually use what people usually think of as sand: "The sand itself will also be sustainably sourced – it’ll consist of
by kwhitefoot 3y ago
The article points out that it doesn't actually use what people usually think of as sand:
"The sand itself will also be sustainably sourced – it’ll consist of crushed soapstone, which is a manufacturing byproduct of another local industry."
- londons_explore 3y agoAnd 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).