The French-owned energy company saw its satisfaction rating increase to 71 per cent for 2013, from 65 per cent last year.
Joint table-toppers SSE also registered a satisfaction level of 71 per cent, although this fell from 73 per cent in 2012.
Martin Lawrence, managing director at EDF Energy, said: “We are determined to give customers the excellent service they expect and we have worked hard to improve our performance.
“We admitted that our service fell below the standard customers deserve following the introduction of a new customer service system two years ago. This result shows the huge improvement we have made.”
At the bottom of the NCSI table was Npower, which had a rating of 63 per cent, which fell from 68 per cent last year.
A spokesperson from Npower said: “We’re disappointed by these results. Our customers – and the level of service we can provide – are our number one priority and that’s why we invested over £200 million in a new customer service system.
“We’ve just finished moving nearly six million customer accounts to the system, which will ultimately allow us to respond to customer queries quickly and more efficiently.”