EON SE has agreed to buy Ovo Energy Ltd, a deal that could turn the pair into the UK’s biggest domestic electricity supplier. The merger would bring two major players together, creating a provider with a market share that could eclipse rivals like Octopus Energy in a sector tightening under new regulations and rising customer expectations.

Ovo has struggled to meet Ofgem’s tougher financial‑resilience rules, which demand higher capital buffers to absorb shocks such as the 2022 energy crisis. Seeking investors, the company has looked to a larger partner to shore up its finances and meet regulatory thresholds. This alignment could also streamline operations and reduce overheads across the combined network.

EON serves about 5.6 million customers, while Ovo accounts for roughly 4 million. Together, the merged entity would command roughly 27% of domestic electricity sales, surpassing Octopus Energy’s share. That concentration could shift competitive dynamics and bargaining power with suppliers. Investors will scrutinize how the combined scale impacts pricing strategies and market stability.

The purchase price remains undisclosed, and the deal must clear approvals from the UK’s Competition and Markets Authority and other regulators. EON says the transaction is slated to close in the second half of 2026, a timeline that will test regulatory patience and market readiness.