National Thermal Power Corporation (NTPC) has posted a 24% increase in net profit after tax at Rs 1,308 crore for the quarter ended June 30, 2005 as compared to Rs 1,054 crore in Q1FY05. According to a release issued by NTPC to the BSE, total income has increased to Rs 6,609 crore in Q1FY06 from Rs 5,729 crore in Q1FY05.