The company has also stated that it has improved its call answering time by over 60 per cent, while its total number of customer accounts at the end of April was nearly 16 million.
Looking ahead, British Gas said it expected that wholesale energy prices will remain high in the UK.
"While the current outlook for gas prices does create a challenging environment for energy suppliers, we will take the necessary action to deliver reasonable margins in the retail business," the company added.
British Gas recently launched a major initiative to provide its 13 million domestic customers with energy saving light bulbs.
It is hoped that the move will reduce household carbon emissions by almost nine million.
Click here to run an energy price comparison, and see if you could be paying less for your gas and electricity.