POWER generation major NTPC will soon see 7% of its generation vanish off the grid, thanks to wagon breakers who managed to topple a rake carrying coal to its Kahalgaon Thermal Power station in Bihar, rendering the track unusable for at least 4-5 days. This track, owned by NTPC, is its main link to source coal. About 1,600 mw of generation capacity, of a total 2,340 mw at Kahalgaon, has already been rendered idle. Another 740 mw is running at technically the lowest plant load factor