Consumer advocate Which? has named Octopus Energy, Utility Warehouse, and 100Green as the top energy suppliers for 2025, based on a survey of nearly 12,000 customers across Great Britain.
The annual survey evaluated 17 suppliers, assessing customer feedback alongside operational practices. Key factors included customer support, complaint handling, smart meter performance, and ease of contact.
Utility Warehouse scored highest overall but fell short in customer satisfaction. Despite strong operational scores, customers reported difficulties in reaching support and found communications unclear, which negatively impacted customer perceptions.
In contrast, Octopus Energy and 100Green stood out for their high customer satisfaction ratings. Octopus Energy, now the UK’s largest electricity supplier, received praise for its service quality and effective communication. Both companies earned the title of Which? Recommended Provider, requiring a minimum customer score of 70% and at least three stars in all categories.
The lowest-ranked suppliers were British Gas, Ovo Energy, and So Energy, all scoring poorly in customer satisfaction and operational practices. Ovo Energy and Scottish Power had particularly low customer scores, indicating significant dissatisfaction.
The average customer score across all suppliers this year was 66%, showing a slight improvement from previous years.
