Shell has officially become a gas and electricity supplier, moving 700,000 First Utility customers to its Shell Energy brand.
All Shell Energy's customers will be moved on to 100% renewable electricity tariffs.
Shell Energy chief executive Colin Crooks said:
"We are building on the disruptive nature of First Utility to give customers something better. We know that renewable electricity is important to them and we are delivering that, while ensuring good value and rewarding loyalty."
Mark Gainsborough, Shell's executive vice president of new energies, said:
"This is a good example of our approach to building a significant electricity business, in line with customer needs.
"Shell recognises the world needs more energy with lower emissions and this will give customers more flexibility, greater control and cleaner energy."
Shell is the world's largest listed oil company and said it is aiming to becoming the largest electricity supplier by the 2030s. The rebrand of First Utility to Shell Energy sets up Shell to take on the "Big Six" suppliers who have lost millions of customers in recent years.
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