Profits over the second quarter to the end of June stood at £471 million, up from £418 million a year earlier.
"In a quarter with a high level of scheduled maintenance, operating performance remained strong," BG chief executive Frank Chapman said in a statement.
Profits over the half-year fell by nine per cent however, reaching £903 million compared to £996 million a year earlier.
Operating profit over the quarter reached£747 million in total.
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