The “upstream business” – extracting oil and gas – is another major source of profits. Centrica, which owns British Gas, the biggest energy supplier in the UK, saw adjusted operating profit for this arm of the business reach £906 million in the first six months of the year – an increase of more than 1,100%. At the same time, British Gas itself saw operating profit fall by 43%, hitting £98 million.
Article source: https://www.huffingtonpost.co.uk/entry/energy-prices-rising-suppliers-record-profits_uk_62f41502e4b0ab35e0afbcb7