Energy company complaints double

%VIRTUAL-SkimlinksPromo%Complaints about Npower and Scottish Power doubled in the first quarter of this year after new billing systems caused problems for customers.

Citizens Advice and Citizens Advice Scotland said complaints about Npower rose from 306.8 for every 100,000 customers in the last quarter of last year to 592.4 between January and March - or one complaint for every 168.8 customers.