EDF eyes So Energy customers in consolidation push

EDF Energy is among bidders in discussions over So Energy’s customer portfolio, potentially adding around 300,000 household electricity customers as consolidation continues across the UK energy retail market.

Talks remain at an exploratory stage, and no transaction has been agreed. At least one other bidder is understood to be involved, while any deal with EDF is expected to focus on acquiring So Energy’s customer base rather than necessarily taking ownership of the entire operating business.

So Energy is majority-owned by Ireland’s Electricity Supply Board, which took control of the supplier in 2021. The business is working with PwC after ESB began evaluating divestment options following a strategic review intended to concentrate the Irish group on its core activities.

So Energy said: “So Energy is considering a range of options but cannot comment any further on them as it is commercially sensitive.”

The discussions would add another transaction to a domestic supply market reshaped repeatedly since the energy crisis. Dozens of smaller suppliers failed during the period of extreme wholesale-price volatility, transferring millions of customer accounts to larger competitors through Ofgem’s supplier-of-last-resort process.

The market is now entering a different phase. Rather than emergency transfers after supplier failures, larger operators are pursuing planned combinations and portfolio deals. E.ON and OVO are already progressing their own combination, which would create another supplier with sufficient scale to compete more closely with Octopus Energy and British Gas.

EDF is already one of the largest operators in the sector, supplying around three million customers through approximately five million accounts. Its UK activities extend well beyond retail supply into nuclear generation, renewables, electric-vehicle services, heat pumps, solar, batteries, and other electrification products.

Customer scale matters because retail energy supply combines thin margins with substantial fixed costs. Billing systems, smart-meter operations, regulatory compliance, customer support, hedging, vulnerability programmes, and digital platforms become less expensive on a per-account basis when spread across larger portfolios.

Scale does not remove operating risk. Customer portfolios carry hedging positions, credit exposure, service obligations, data-migration requirements, and regulatory responsibilities. Transferring accounts between platforms can also create billing and service problems if systems, tariffs, and customer records are not integrated cleanly.

The structure of any So Energy transaction will therefore be important. An acquisition of customers alone is commercially different from taking on the wider company, including its people, technology, contractual arrangements, and other liabilities. Any buyer would also need to manage the transition within Ofgem’s regulatory framework.

So Energy has said customers’ supply and support remain unaffected while the strategic review continues. In July, the company described itself as fully hedged and said normal operations were continuing, distinguishing the process from the distressed supplier failures seen during the energy crisis.

That distinction also changes the economics for potential buyers. A stable portfolio allows bidders to assess customer value, hedging, churn, acquisition costs, and operating integration without the emergency timetable that applies when the regulator transfers accounts away from a failed supplier.

The process is unfolding as households face another increase in energy bills after Ofgem raised the price cap. Retail suppliers continue to manage affordability requirements, vulnerable customers, wholesale exposure, regulatory reform, and growing expectations around smarter use of electricity.

A larger account base would also expand the population to which EDF can market electric-vehicle tariffs, heat pumps, solar, batteries, and other electrification services. Those products are becoming more closely integrated with household energy supply as smart meters and time-of-use pricing play a larger role in the power system.

So Energy’s owners have not committed to a sale, and the presence of competing bidders means EDF cannot be assumed to secure the portfolio. The process nevertheless adds to evidence that customer scale, capital strength, technology platforms, and the ability to manage energy-price volatility are becoming increasingly important determinants of competitive position in UK retail energy.