Complaints to energy watchdog Ofgem have almost tripled as bills have soared, The Guardian has reported.
A record 52,308 complaints were made last year, amid mounting consumer dissatisfaction, market investigations and Ofgem-imposed sanctions – a 191% increase on 2013 and more than four times the number made in 2012 (11,283).
It is estimated that the average UK household spent £1,265 on energy last year; £53 more than in 2013 and £271 more than three years ago.
Billing-related issues were the top cause of complaints in 2014, according to the energy ombudsman, accounting for 85% of all complaints recorded (44,385) and up 196% on 2013 (14,994).
Customers receiving incorrect bills accounted for 14% of all billing-related complaints, while 18% were about customers not receiving their bills.
Last year also saw a record for complaints recorded in one month: 5,445, in July.
The second-largest cause for complaint was related to transfer issues, which accounted for 12% of all complaints (6,142) – up 184% on 2013, possibly reflecting an increased number of customers seeking to switch suppliers in 2014.