The largest energy suppliers in the United Kingdom (also known as Big Six) include British Gas, EDF Energy, E.ON, Npower, Scottish Power, and SSE. In 2019, Npower was acquired by E.ON. The source did not provide data for E.ON in 2021.
According to the source, three of the suppliers (British Gas, EDF, and ScottishPower) have financial years ending in December whereas SSE’s financial year runs from April to March.
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Energy generation profits in Great Britain 2021, by supplier
In 2021, SSE generated the highest energy generation profit among the leading energy suppliers in Great Britain, at *** million British pounds. ScottishPower recorded the second-highest profit in the segment that year, at *** million pounds. Meanwhile, both British Gas and EDF recorded losses that year.
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Ofgem. (August 31, 2022). Energy generation profits of the leading energy suppliers in Great Britain in 2021 (in million British pounds) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved August 01, 2026, from /statistics/478088/generation-profits-big-six-energy-suppliers-united-kingdom/
Ofgem. "Energy generation profits of the leading energy suppliers in Great Britain in 2021 (in million British pounds)." Chart. August 31, 2022. ÌÇÐÄÆƽâ°æ. Accessed August 01, 2026. /statistics/478088/generation-profits-big-six-energy-suppliers-united-kingdom/
Ofgem. (2022). Energy generation profits of the leading energy suppliers in Great Britain in 2021 (in million British pounds). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: August 01, 2026. /statistics/478088/generation-profits-big-six-energy-suppliers-united-kingdom/
Ofgem. "Energy Generation Profits of The Leading Energy Suppliers in Great Britain in 2021 (in Million British Pounds)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 31 Aug 2022, /statistics/478088/generation-profits-big-six-energy-suppliers-united-kingdom/
Ofgem, Energy generation profits of the leading energy suppliers in Great Britain in 2021 (in million British pounds) ÌÇÐÄÆƽâ°æ, /statistics/478088/generation-profits-big-six-energy-suppliers-united-kingdom/ (last visited August 01, 2026)
Energy generation profits of the leading energy suppliers in Great Britain in 2021 (in million British pounds) [Graph], Ofgem, August 31, 2022. [Online]. Available: /statistics/478088/generation-profits-big-six-energy-suppliers-united-kingdom/
