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Best and Worst UK Energy Suppliers Named in Annual Rankings
Which? surveyed nearly 12,000 UK energy customers in 2023, ranking E highest with 79% satisfaction and Scottish Power lowest at 56%, exposing service and complaint handling gaps.
- On Monday 19 January 2026, Which? named E best, based on a survey of almost 12,000 energy customers conducted in September and October.
- Which? combined customer responses with an in-depth assessment of 17 energy firms' behind-the-scenes practices, urging customers to switch to cheaper fixed tariffs if unhappy with value or service.
- Octopus Energy finished second with 74%, followed by 100Green at 72% and Sainsbury's Energy at 71%, while Scottish Power scored lowest at 56% with the weakest complaints handling.
- Complaints have fallen over 20% each year for the past two years, Uswitch and UKCSI acknowledged, while EDF, Centrica, and Scottish Power cited ongoing improvements and the Citizens Advice scorecard.
- Greg Jackson noted Octopus Energy’s long-standing Which? endorsement, saying it was first recommended nine years ago; Which? energy editor Emily Seymour warned firms falling short risk losing customers.
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Coverage Details
Total News Sources50
Leaning Left7Leaning Right1Center34Last UpdatedBias Distribution81% Center
Bias Distribution
- 81% of the sources are Center
81% Center
L 17%
C 81%
Factuality
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