KYIV: Friends often ask Mykhailo whether the Ukrainian power plant worker hides in a shelter when Russia bombards the energy system. “If all the turbine operators hid during attacks, there’d be no energy left,” he said, standing inside the machine hall of a thermal power plant. “We have to stay at our posts. Who else would do the job?” Almost four years into Russia’s invasion, keeping Ukraine’s lights on has become a battle of its own — fought along a moving front line.