German energy giant E.ON has agreed to acquire struggling British energy firm Ovo in a deal that, if approved by regulators, would create the United Kingdom's largest gas and electricity supplier by customer numbers, serving approximately 9.6 million households.
E.ON, one of Europe's largest energy companies, announced on Monday that it had reached an agreement to purchase Ovo Energy, a UK-based rival that has faced financial difficulties in recent years. The transaction would combine E.ON's existing UK customer base with Ovo's roughly 5 million accounts, producing a combined portfolio of 9.6 million households.
If the deal clears regulatory scrutiny, the merged entity would surpass Octopus Energy — which currently supplies almost 8 million UK homes — as the country's dominant retail energy provider.
Ovo was founded in 2009 and grew rapidly to become one of Britain's most prominent independent energy suppliers, at one point positioning itself as a consumer-friendly alternative to the so-called 'Big Six' legacy providers. However, the company has struggled in the years since the 2021–22 energy crisis, which saw wholesale gas prices surge following Russia's invasion of Ukraine and left many suppliers facing severe financial strain.
E.ON, headquartered in Essen, Germany, already operates a substantial UK retail energy business and has been expanding its footprint in the British market. The acquisition of Ovo would represent a significant acceleration of that strategy.
The deal is subject to approval from the Competition and Markets Authority (CMA), which will assess whether the consolidation raises concerns about reduced competition in the retail energy market. The UK energy sector has already seen considerable consolidation in recent years, with several smaller suppliers having collapsed and their customers transferred to larger firms.
Neither E.ON nor Ovo disclosed the financial terms of the transaction at the time of announcement. Further details are expected to emerge as the regulatory process gets underway.
Consumer groups are likely to scrutinise the deal closely, given that a single supplier controlling more than 9 million households would represent an unprecedented level of market concentration in British retail energy. Campaigners have previously raised concerns about the pace of consolidation in the sector and its potential impact on pricing and service quality for consumers.
Analysis
Why This Matters
- A combined E.ON–Ovo entity would control a larger share of UK retail energy than any single supplier in the country's modern history, raising significant questions about competition, pricing power, and consumer choice.
- The deal signals ongoing consolidation in the UK energy sector following years of market turbulence, with implications for how millions of British households receive and pay for their energy.
- Regulatory decisions on this deal may set a precedent for how the CMA treats further consolidation in essential utility markets.
Background
The UK retail energy market was dramatically reshaped by the 2021–22 global energy crisis, triggered in large part by supply disruptions following Russia's invasion of Ukraine. Wholesale gas prices spiked to record levels, and more than 30 smaller UK energy suppliers collapsed, forcing millions of customers onto suppliers of last resort. The government and regulator Ofgem introduced a series of emergency measures, including an energy price guarantee for households.
Ovo Energy, once celebrated as a disruptive challenger brand, was among the companies that faced severe pressure during this period. Founded by Stephen Fitzpatrick in 2009, Ovo had grown through acquisitions — most notably purchasing SSE's retail arm in 2020 — but the energy crisis exposed the financial fragility of firms with significant customer exposure and limited hedging capacity.
Meanwhile, consolidation among the survivors has continued. Octopus Energy has risen to become the UK's largest supplier, in part by absorbing the customer books of failed rivals. E.ON UK itself was formed when the company took over npower's customers following that brand's withdrawal from retail supply.
Key Perspectives
E.ON: The German energy giant stands to gain a dominant position in the lucrative UK retail market and significant economies of scale in billing, infrastructure, and customer service operations. Expanding its UK base aligns with E.ON's broader European growth strategy.
Ovo Energy / Founder Interests: A sale to E.ON may represent the most viable exit route for Ovo's investors and founder Stephen Fitzpatrick, allowing the business to continue operating under a financially stronger parent rather than facing potential collapse or further restructuring.
Critics/Skeptics: Consumer advocacy groups and competition watchdogs are likely to raise concerns about the concentration of market power in the hands of a single supplier serving nearly one in three UK households. Critics may argue that reduced competition could erode incentives to offer competitive pricing or improve customer service, particularly for vulnerable consumers.
What to Watch
- The Competition and Markets Authority's (CMA) formal review timeline and whether it launches a Phase 2 in-depth investigation into the deal's competitive impact.
- Ofgem's response, including whether the energy regulator imposes conditions on the merger related to pricing, service standards, or customer protections.
- Whether Octopus Energy or other rivals mount a competing bid or legal challenge to block the acquisition.