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British Gas is the largest retail electricity supplier in Great Britain. Despite a notable decline throughout the years, it still accounted for ** percent of the market as of December 2024. E.ON followed closely, with a market share of ** percent.

 Changes in the Big Six 

The electricity market in Great Britain has historically been controlled by a few providers, collectively known as the Big Six. These include British Gas, E.ON, SSE, EDF, Npower, and Scottish Power. However, recently, there have been significant changes in their composition. In January 2020, OVO Energy acquired SSE's electricity and gas distribution business, albeit continuing to sell energy under the SSE brand. Meanwhile, Npower was acquired by E.ON in 2019, turning the Big Six into a de-facto Big Five.

 Growing competition in the British electricity supply market 

In 2010, the Big Six held *** percent of the domestic electricity supply market in GB. To promote a more competitive market, the British energy regulator, Ofgem, enacted a series of market reforms aimed at increasing access for smaller players. The past decade has seen a significant number of domestic customers switching from large electricity suppliers to small and mid-tier suppliers, causing the Big Six’s market share to dip to ** percent in 2024.