State-run power major NTPC reported a marginal growth of 5.5 per cent in profit after tax to Rs 8,656.53 crore for the financial year ended March 31,2010. The country's largest power producer had a profit after tax of Rs 8,201.30 crore during the last financial year,NTPC Chairman and Managing Director R S Sharma said. Shares of NTPC Ltd were quoting at Rs 207.15,up 0.24 per cent in the afternoon trade on the National Stock Exchange.