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Centrica: customer and site numbers by type 2014-2019

Between 2014 and 2019, the number of customers and sites supplied by British multinational utility company Centrica has been in steady decline. In 2019, roughly 6.8 million customers and sites were supplied gas by Centrica. This was a decrease of almost 1.5 million compared to just four years prior. The number of customers supplied electricity also dropped that year to 5.36 million.

Domestic market shares

Through its England and Wales serving subsidiary British Gas, Centrica has the largest market share of both the gas and electricity supply in Great Britain. The energy service provider had a share of 28 percent of the gas supply market in the fourth quarter of 2019. Similarly, British Gas was the leader in the electricity supply market, with a market share of 19 percent at the end of 2019. However, these shares have been gradually decreasing in recent years as more green energy utility companies have entered the market.

Domestic supply revenue

Whilst Centrica’s domestic electricity supply revenue has seen an overall increase over the last decade, domestic gas supply revenues have fallen significantly. In 2013, the company had still recorded a gas supply revenue of 6.1 billion British pounds, but by 2019 this figure had declined to 3.6 billion British pounds.

Number of customers and sites supplied by Centrica from 2014 to 2019, by type

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Release date

March 2020


United Kingdom

Survey time period

2014 to 2019

Supplementary notes

Since 2009, the Office of Gas & Electricity Markets (OFGEM) require the so-called 'Big Six' large energy suppliers to provide an annual consolidated statement (CSS) to show the costs, revenues and profits for the different segments of their generation and supply businesses.

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Statistics on "Centrica and British Gas"

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