Lei Hua built a stack of eight servers that run day and night, mining for the cryptocurrency. He paid 10,000 yuan (approximately US $1400) in June 2017 to buy his first cryptomining machine, which he set up at his home. However, the headmaster soon discovered that his activities were consuming a significant amount of electricity 21 kWH per day and in an attempt to save himself money, he relocated the machine to his schools computer room, where it was soon joined by more mining machines.”]