"NTPC has decided to raise Rs 3,925 crore through private placement of secured non-convertible debentures at a coupon of 7.37 per cent per annum with a door to door maturity of 15 years on December 14, 2016. The proceeds will be utilised to finance capital expenditure/refinancing the debt requirement in on-going projects and other general corporate requirements," NTPC Ltd said in a BSE filing today.