Financial years ending December, except for SSE. SSE's financial year runs from April do March.
The source adds: "Following OVO’s acquisition of SSE’s domestic supply business, the aggregated domestic profit margin for 2020 does not include OVO/SSE’s data. This is because in 2020 OVO did not hold any generation licence and was not legally required to submit a Consolidated Segmental Statement."
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Profit margin of large energy suppliers in Great Britain 2009-2020
Profit margins for the energy supply segment of large utilities in Great Britain decreased overall in 2020. While profit margins for domestic supply improved from the previous year, to a negative *** percent, figures for non-domestic supply were negative for the first time in the indicated period.
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Ofgem. (August 1, 2021). Profit margin in the supply segment for large energy suppliers in Great Britain from 2009 to 2020 [Graph]. In ÌÇÐÄÆÆ½â°æ. Retrieved August 03, 2026, from /statistics/478138/energy-suppliers-profit-margin-united-kingdom/
Ofgem. "Profit margin in the supply segment for large energy suppliers in Great Britain from 2009 to 2020." Chart. August 1, 2021. ÌÇÐÄÆÆ½â°æ. Accessed August 03, 2026. /statistics/478138/energy-suppliers-profit-margin-united-kingdom/
Ofgem. (2021). Profit margin in the supply segment for large energy suppliers in Great Britain from 2009 to 2020. ÌÇÐÄÆÆ½â°æ. ÌÇÐÄÆÆ½â°æ Inc.. Accessed: August 03, 2026. /statistics/478138/energy-suppliers-profit-margin-united-kingdom/
Ofgem. "Profit Margin in The Supply Segment for Large Energy Suppliers in Great Britain from 2009 to 2020." ÌÇÐÄÆÆ½â°æ, ÌÇÐÄÆÆ½â°æ Inc., 1 Aug 2021, /statistics/478138/energy-suppliers-profit-margin-united-kingdom/
Ofgem, Profit margin in the supply segment for large energy suppliers in Great Britain from 2009 to 2020 ÌÇÐÄÆÆ½â°æ, /statistics/478138/energy-suppliers-profit-margin-united-kingdom/ (last visited August 03, 2026)
Profit margin in the supply segment for large energy suppliers in Great Britain from 2009 to 2020 [Graph], Ofgem, August 1, 2021. [Online]. Available: /statistics/478138/energy-suppliers-profit-margin-united-kingdom/