Centrica Results Presentation Deck

Adjusted operating profit drivers £264m H1 2020 Covid-19 and Downstream commodity and weather industrial action (£58m) H1 2020 – (£29m) Impacts: £139m Mitigations £110m H1 2021 - (£87m) Impacts: £107m Mitigations £20m £59m Whitegate CCGT outage (£28m) Energy services and supply £85m British Gas S&S: £18m British Gas Energy: £27m CBS: £25m Bord Gais Energy: £15m Energy Marketing & Trading (£118m) Core underlying: (£88m) Legacy gas contract: (£30m) Upstream £58m Spirit: £71m CSL: £11m Nuclear: (£24m) The above adjusted figures are before exceptional items and certain re-measurements. Adjusted operating profit includes share of joint ventures and associates after interest and taxation. A reconciliation of adjusted operating profit is provided in the Group Financial Review in the Interim Results announcement. 8 Interim Results 2021 centrica £262m H1 2021

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