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 Triangulates energy consumption days from hashprice index, CCAF and Blockware which are in broad agreement now. 
 What's the error range/margin? 300%? 
 They are all within 10% of eachother once you factor in PUE consistently across all measures. Cambridge energy consumption has improved a lot since they updated their miner mix in Aug last year. 
 How is the error margin calculated? This precision requires knowing the exact hardware.