India’s biggest power company said coal shortages at six of its power stations are threatening to disrupt electricity generation in 22 of the country’s states and territories. In a letter to India’s Power Ministry on Monday, Arup Roy Choudhury , chairman of NTPC Ltd. said the generating stations had coal supplies sufficient for two days or less of power production. Mr. Choudury’s letter, reviewed by The Wall Street Journal, didn’t say why coal was running low. Coal shortages–mainly because of failures by the state-run coal monopoly to deliver adequate supplies–are a major cause of power outages in India, where more than half of electricity-generation capacity depends on coal. Power supplies are especially strained now, with hot summer temperatures pushing up demand and below-normal monsoon rainfall denting generation by hydroelectric plants. According to government data, as many as 46 of India’s 100 coal-fired power stations have coal stocks of […]