Conn said the 2015 profit figure, of £55 per customer was only slightly lower than the average British Gas profit over the last five years of £586 million.
British Gas is the only company to have cut gas prices three times during the last year, and bills have fallen by £100 on average.
Centrica is preparing to rationalise its exploration and production business but Conn said it was not a wise time to sell assets and that any exit would take time.