Bitcoin miners operating in northern Norway and Sweden, where they sought refuge from sky-high electricity prices earlier this year, are powering down for the winter as energy tariffs surge. Just a few months ago, European miners flocked to the continent’s northernmost regions, which have among the cheapest power prices in the world due to abundant hydroelectric power and low demand, as prices across the continent soared. Some even left for the Americas. Now they’re facing record-high prices – and it is only the start of winter, when demand rises for heating. (Coindesk)