The coal-fired power plants in Germany are profitable to run again amid surging electricity demand in a cold snap and a plunge in European carbon prices this week. Coal plants running on lignite, the dirtiest coal, returned to profit after carbon prices slumped by about 8% so far this week, following a jump in the previous week, analysts at Energy Aspects Ltd and LSEG told Bloomberg. The plunge in carbon permit prices made coal-fired power plants in Germany more profitable to run than gas-fired capacity, according to the analysts. Coal…