Budget Energy has emerged on top in a customer satisfaction survey conducted by consumer organisation Which.
The North West based electricity supplier scored 61 points, significantly ahead of its rivals.
Gas supplier Firmus came second with 53 followed by SSE Airtricity on 51 and Power NI on 48.
The figures were based on customers’ overall satisfaction combined with their likelihood to recommend the supplier to friends or family.
The companies were also given separate ratings on a range of criteria including customer service, value for money and how they dealt with complaints.