Electricity production in India's biggest underground hydroelectric project on Sutlej's tributary Bhaba Khad river was suspended on Sunday due to rise in silt in river. The amount of silt in Sutlej has crossed 8,000 parts per million (ppm) in Nathpa Jhakri dam in Himachal Pradesh. An official said production will remain suspended till the silt content goes below 5,000 ppm.