A host of issues including heavy rains disrupting coal supply, workers’ strike at largest producer Coal India and Telangana agitation in the South have snapped fuel supply at power stations over the past month. More than half of the country’s 86 thermal power stations are currently running at “critical" stocks of less than seven days, while more than a third of the plants have become “super critical", according to Central Electricity Authority (CEA), the apex power sector planning body.