Royal Dutch Shell has said it will consider “all opportunities” to expand in the UK household gas and electricity supply market, declining to rule out acquiring one of the Big Six suppliers.

The Anglo-Dutch oil giant today rebrands First Utility, the supplier it bought in 2017, as Shell Energy and will start offering discounts on fuel at Shell petrol stations for its household gas and electricity customers as the first step in an ambitious plan to grab market share.

It has switched all of its customers to renewable electricity and has cut its prices to among the cheapest in the market as part of an aggressive growth strategy aimed at significantly expanding its customer base from the current level of 710,000 households.

Mark Gainsborough, head…