FILE - In this Wednesday, Nov. 28, 2018 file photo, plumes of smoke rise from Europe's largest lignite power plant in Belchatow, central Poland. Energy experts were working to restore full operations at Poland’s biggest power plant, the lignite-fueled Belchatow, after an energy network failure switched off 10 of the plant’s 11 units. Energy imports from Germany and Sweden were needed to fill in for the suddenly missing power. (AP Photo/Czarek Sokolowski, File)