E.ON Next finalized its purchase of Ovo Energy on Thursday following regulatory approval from Britain’s competition watchdog. The transaction creates a market structure where the three largest energy suppliers dominate household service delivery across Great Britain. E.ON Next will now hold approximately 25% of the market, making it the second-largest supplier with roughly 13.45 million gas and electricity accounts. Octopus Energy maintains the largest share at 26% with 14.3 million accounts, while British Gas holds approximately 23% of the market with 12.5 million accounts.
The deal represents a significant consolidation in an industry that previously sought to increase competition and lower prices for consumers. A decade of efforts to reduce the dominance of the legacy “Big Six” suppliers has effectively resulted in a “Big Three” market structure. When including EDF Energy and Scottish Power, these five suppliers will control approximately 90% of Great Britain’s household energy market. This concentration stands in stark contrast to 2016, when the Competition and Markets Authority warned that weak competition was costing customers an estimated £1.4 billion to £1.7 billion annually in overpayment.
Market observers have raised concerns about the implications of this consolidation for consumer choice and pricing pressure. Industry analysts note that while larger suppliers provide operational stability following a wave of company failures during the 2021/22 energy crisis, reduced competition may diminish incentives for price reduction and service differentiation. The energy sector experienced significant upheaval after 2016, with a surge in new entrants followed by dozens of supplier failures. E.ON UK leadership contended that the market remains “fiercely competitive” and emphasized the company’s capacity to innovate and serve customers effectively going forward.
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