Customers have made almost 20 times as many complaints about the worst energy supplier than they have about the best performing company.
That’s according to Citizens Advice which has launched its energy supplier performance league table that includes data about the 18 largest companies in the UK.
It ranks energy companies from best to worst based on how they handle complaints made to independent bodies.
It states ScottishPower is still the worst firm as it received 944 complaints per 100,000 customers.
Extraenergy is the second worst with 769 complaints every 100,000 customers.
On the other hand, SSE was crowned the best supplier for customer service with 47 complaints per 100,000 customers.
Companies such as EDF Energy, Ecotricity, British Gas, E.ON, Good Energy and Green Star had fewer than 100 complaints.
Citizens Advice has also launched a tool for customers which allows them to compare information about what each energy firm offers.
Gillian Guy, Chief Executive of Citizens Advice said: “Consumers need the whole picture on energy suppliers so they can choose who to buy their energy from on the basis of what’s most important to them whether that’s price or service. Complaints are a significant part of this and people will rightly question why some energy firms have nearly 20 times as many complaints as others.”
Energy suppliers spend around £125 million a year to handle complaints.