The German utility giant Eon has agreed to buy the retail arm of Ovo Energy in a transaction that will create Britain’s largest household energy supplier and end the 17-year run of one of the country’s best-known challenger brands as an independent operator.

The deal, the value of which has not been disclosed but is understood by industry sources to be worth up to £600 million, will hand Eon roughly four million additional customers and lift its UK book to about 9.6 million households. That tally vaults the combined business past Octopus Energy, which had emerged as the market leader after absorbing the remnants of Bulb in 2022.

For Ovo, the sale draws a line under a torrid 18 months in which the Bristol-based supplier warned in its most recent annual report of “material uncertainty” hanging over its future. The company had been struggling to meet the financial resilience benchmarks introduced by Ofgem after the wave of supplier failures that swept the sector in 2021 and 2022, and had drafted in advisers at Rothschild to shore up its balance sheet.

Ofgem had previously granted Ovo additional time to rebuild its capital buffer on the condition that the company set out a credible road map back to compliance. A sale to a deep-pocketed European utility removes that constraint at a stroke.

Stephen Fitzpatrick, the entrepreneur who founded Ovo from a flat in Notting Hill in 2009 and who built it into one of the few genuine British challengers to the so-called Big Six, said the writing had been on the wall for some time. “Energy retail is now more regulated, more capital intensive and increasingly dependent on long-term investment and scale,” he said. “In that context, bringing Ovo together with Eon is the right next step for customers, for colleagues, and for the long-term commitment that decarbonisation requires.”

The transaction is a striking reversal of fortune for a business that, only six years ago, was itself the consolidator. In 2020 Ovo paid roughly £500 million to take over SSE’s retail arm, a deal that quadrupled its customer base overnight and briefly made it the country’s second-largest supplier. The integration proved bruising, however, and the energy price shock that followed Russia’s invasion of Ukraine left the company badly exposed.

In a separate but parallel transaction, Ovo has agreed to sell its home services arm, which provides boiler insurance and servicing contracts, to the British energy services firm Hometree. That carve-out leaves Ovo Group with Kaluza, its technology platform, which licenses customer-management and flexibility software to third-party utilities including the French group Engie. Kaluza is widely regarded as the more strategically valuable half of the business and is not part of the Eon deal.

Marc Spieker, chief operating officer for commercial at Eon, framed the acquisition as a long-term bet on the British market’s role in the energy transition. “The United Kingdom is an important growth market for Eon, particularly for flexibility and customer-focused energy solutions,” he said. “Energy flexibility and electrification are becoming increasingly important and are critical to the success of the energy transition.”

Eon, headquartered in Essen, already operates in Britain through Eon Next, the rebranded successor to the old Npower retail business it acquired as part of its 2019 takeover of Innogy. The Ovo deal will give it a commanding presence in the heat-pump, smart-tariff and electric-vehicle charging markets that are expected to drive growth as households electrify.

The acquisition is subject to clearance from regulators including the Competition and Markets Authority and Ofgem, and is expected to complete in the second half of the year. Industry analysts will be watching closely to see whether the combined entity’s 9.6 million customer base attracts close scrutiny from competition authorities, given that it would account for roughly a third of all British households.

For SME suppliers and the smaller challengers still battling for market share, the message is unambiguous. The era in which a charismatic founder with a clever app and a hedged book of supply contracts could disrupt the British energy market appears, for now at least, to be over. Scale, balance-sheet strength and the patience of a European parent are once again the prerequisites for survival.

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Eon swallows Ovo in £600m deal that crowns Germany’s biggest energy giant as Britain’s largest supplier