The company was launched in the United Kingdom in April 2014 and by October of that year was the fastest-growing energy supplier in the country.

[3] The energy supplier consistently featured in "best buy" tables since it launched into the UK market by offering the best dual fuel tariffs,[4] although it drew 1,682 complaints per 100,000 customers in the first three months of 2016, according to figures from Citizens Advice, which said this was "the highest complaints ratio ever recorded" in the five years since it began compiling league tables.

[5] The company appointed Ben Jones,[6] previously CEO of BES Utilities, as managing director of operations in 2015, and hired Richard Rose,[7] formerly director of financial control at RWE npower, as chief financial officer.

[8] The regulator OFGEM automatically protected supplies[9] and assigned Scottish Power as the replacement provider for existing customers after a competitive process.

[10] The next month, Mike Denny, Matthew Hammond and Ian Green of PricewaterhouseCoopers LLP were appointed as joint administrators of Extra Energy.