The standard variable gas tariff will increase by 5.5% or £29 and the standard electricity tariff will rise by 9% or £49.

The price hikes come into effect from 21 June.

The firm said it had delayed the move until the summer when customers use less energy.

This is the second time in a matter of months EDF has announced price increases.

In December 2016, the energy giant revealed plans to hike electricity prices by 8.4% in March 2017.

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The effect of both changes will see the average bill of a dual fuel direct debit customer rise by £91.

EDF blamed the price hikes in part on the rising costs of wholesale energy.

EDF Energy CEO Vincent de Rivaz, said: “I know that price rises are never welcome, but the industry is facing significant cost increases. To be a sustainable and responsible business, we aim to make a fair margin in supplying customers.

“This fair margin allows us to invest for the long-term, in particular in good service, innovation and smart metering. It also allows us to help more customers choose the right tariff for them. We have cut all the costs under our control without compromising our customer service.”

“We accept that the government, regulators and consumer groups have concerns about the way markets work for customers, particularly the energy market. We will continue to work with them constructively for the benefit of customers.”

Will Hodson, co-founder of consumer collective TheBigDeal.com, which is focused on reducing people’s energy bills, said: “EDF have seen almost 100,000 customers leave them for better prices. A sensible response would be to improve your treatment of those who remain. Only in the energy market does it make sense to flog your most loyal customers even harder.

“For the 5.2 million customers who remain with EDF this second price rise is a slap in the face. It could be the straw that breaks the camel’s back.”