When people talk about British electricity bills, the conversation usually goes one way: expensive. The Ofgem price cap sits at nearly 25p per kilowatt-hour, higher than Hong Kong, France and Spain. That figure is accurate, but using it to compare electricity costs across countries is a fundamental misreading of how the UK energy market works.
Britain’s electricity market has been fully liberalised since the 1990s and is among the most open retail energy markets in the world. Households are free to choose their supplier and tariff — the Ofgem price cap exists solely to protect consumers who never actively shop around, not to represent the best available option. Treating the cap as a proxy for “UK electricity prices” is like using the most expensive item on a supermarket shelf to represent what people actually pay for groceries.
Households who understand the market pay 5.5p per kilowatt-hour for overnight electricity between 23:30 and 5:30 — the confirmed rate from 1 April for new customers on Octopus Energy’s Intelligent Go (IOG) tariff. Existing customers, depending on region and tariff version, can pay as little as 3.49p to 5.2p per kilowatt-hour. Put these numbers alongside the rest of Europe and they become almost implausible: France’s cheapest fixed off-peak rate (Heures Creuses) sits at around 13p, Germany at 15–18p, Spain at 14–18p, and even Norway — famous for its cheap hydropower — sees households paying 10–12p per kilowatt-hour overnight once VAT and grid fees are included. On the measure that actually matters — the all-in price a consumer pays during fixed overnight hours — IOG is the cheapest in Europe, without exception.
This is not a government subsidy. Octopus uses artificial intelligence to coordinate the charging of over 150,000 electric vehicles, absorbing surplus electricity from the grid during the small hours when demand is lowest and generation is highest. The structural oversupply of overnight electricity — driven largely by Britain’s rapidly expanding offshore wind fleet, the largest in Europe — becomes a direct benefit to customers, while simultaneously helping to balance the grid. It is a privately funded virtual power plant, built on market design rather than public money.
IOG is specifically designed for households who can charge an electric vehicle at home. Those without home charging — whether renting, without a driveway, or simply not yet EV owners — are not without options. Octopus’s Cosy tariff offers heat pump owners several fixed cheap slots each day. The Agile tariff passes through half-hourly wholesale prices directly to customers, meaning that during periods of high wind or excess solar generation, the rate can fall close to zero or even turn negative. E.ON, EDF and other suppliers offer their own competitive overnight tariffs. The market is genuinely competitive, and the options extend well beyond a single product.
Whichever tariff a household chooses, a home battery system increasingly makes the economics even more compelling. As LFP battery technology has matured, prices have fallen sharply. A 10–16 kilowatt-hour home battery with inverter can now be supplied and installed for a few thousand pounds. Charged overnight at the cheapest tariff rate and discharged during the day, the system effectively replaces daytime grid electricity — bought at around 25p — with overnight electricity bought at a fraction of that price. At 5.5p overnight against 25p daytime, payback periods of four to six years are achievable, against a battery lifespan of fifteen years or more.
Britain does not have France’s nuclear fleet or Norway’s mountain reservoirs. What it has is wind — abundant, structural, and growing — and a market architecture designed to translate that resource into tangible savings for engaged consumers. The question was never whether UK electricity is expensive. The question is whether you have taken the time to understand your choices.
