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EDF Energy has agreed to pay £350,000 into Ofgem's consumer redress fund after failing to meet its smart meter installation target in 2017.
EDF completed its annual installation target for 2017 a month late in January 2018.
British energy suppliers need to put smart meters into all homes and small businesses by the end of 2020.
Each supplier is allowed to set their own installation targets, which Ofgem monitors.
EDF Energy has announced that the standing charge on standard variable electricity will increase by 2.7% from 7 June.
If you are a dual fuel customer who has both gas and electricity, and pay by direct debit, then the price rise will be 1.4% - £16 - to £1,158.
The change will only affect 41% of EDF customers who do not have a fixed tariff and use electricity in their homes.
People who have a direct debit gas only account, or are on the safeguard tariff or prepayment meter will be unaffected by the change.
The energy supplier says customers who are affected will be encouraged to save by choosing a fixed tariff or switching to pay their bills by direct debit.
EDF Energy is one of the biggest suppliers of electricity in the UK and the biggest supplier to British business.