Challenger brands to Britain's biggest energy firms have cemented their place at the top of the rankings in an annual customer satisfaction survey.
Energy firms are sometimes keeping customers on hold for more than half an hour before they can get through - and around a fifth typically take over 10 minutes to pick up, according to Which?
Energy customers on standard deals with major suppliers may be paying £220 more a year than they need to typically, according to analysis.
The UK's largest renewable energy supplier, Bulb, is set to expand into France, Spain and Texas in the United States, according to the company's co-founder and chief executive.
Renewable energy supplier Bulb is raising its prices following "substantial increases" in the wholesale cost of gas and electricity.
Energy provider Bulb has secured £60 million of investment from two private equity firms to use as firepower to ramp up expansion.
Renewable energy supplier Bulb has announced plans to raise prices following “substantial” increases in wholesale gas and electricity costs.
The UK’s big six energy firms are overcharging households by hundreds of pounds a year, it has been claimed.