
EDF Energy Networks has been fined £2m for poor customer service, industry regulator Ofgem has said.
It said that the company had failed to meet the required timescales for connecting customers.
EDF had taken steps to improve its connections service but this should have been done earlier, Ofgem said.
"Customers should not have to accept poor service in any part of the energy market, "said Sarah Harrison, Ofgem's managing director.
"All energy companies should be in no doubt that if they are failing to offer good service Ofgem will take tough regulatory action," she added.
EDF distributes electricity to 7.8 million customers in the south and east of England, where it operates and maintains the electrical supply system.
The regulator requires electricity distributors to make a connection offer within three months but Ofgem's investigation found that since 2006, the company had failed to meet this deadline in more than 100 cases.