Latest scores from independent consumer champion Citizen’s Advice found ScottishPower as highest of the UK’s large energy suppliers when it comes to customer service.

The charity has created a ranking system for both familiar energy firms and some lesser-known ones based on the quality of their customer responses.

ScottishPower scored 5 stars for email turnaround time – 98% of people are responded to within two days – with average customer call waiting times also scoring below two minutes.

The latest results mark the fifth quarter in a row ScottishPower has topped the large suppliers for each measure, with our complaints volume also highlighted as continuing to improve.

Andrew Ward, CEO of ScottishPower’s Customer Business, said: “We’ve worked tirelessly to improve and enhance our services for all of our customers and I’m pleased to see the efforts of our team recognised by this latest Citizen’s Advice research.

“Looking after our customers is at the heart of everything we do and we’re committed to providing the best customer service possible; not only reducing call waiting times but giving our customers a number of ways to contact us that best suits their needs.

“This includes our award-winning app, offering a first-class user experience for both direct debit and pre-payment customers and of a live chat facility from 7am to 11pm, 7 days a week.”

The study by national charity Citizen’s Advice is among the most robust and extensive on customer service provision by energy companies in the UK.

(Large suppliers includes those with a market share of at least 5% in either fuel (Gas or Electricity).