UK electricity bills, time-varying tariffs, and balancing costs

The study, published as part of the IFS Green Budget and funded by the Nuffield Foundation, stops short of endorsing the government’s rejected idea of zonal pricing. Instead, it points to a more politically manageable reform: making the default household tariff time-varying. That would encourage consumers to shift usage to cheaper periods, such as EV charging or running appliances overnight or when renewable power is plentiful, reducing the need for costly balancing interventions.

The economics are significant. The report says balancing demand and supply is projected to double in real terms by the end of the decade to £7 billion. That points to a structural upward pressure on bills if the system remains largely unchanged. For policymakers, the appeal of dynamic pricing is that it could lower costs without heavy public spending, while for the grid it could improve efficiency and cut waste from curtailing wind power or firing up gas generation at peak times.

For investors, the message is two-sided. Utilities and grid operators face a market where demand flexibility becomes more valuable and the economics of generation increasingly depend on when power is produced rather than just how much. Companies tied to home energy management, smart meters, EV charging and automated load-shifting could benefit if time-of-use pricing spreads. Retail suppliers may gain room to offer differentiated products, but they would also face a more complex customer proposition and potentially greater volatility in consumption patterns.

The report also broadens the debate over net zero. It argues for a “more balanced” approach that leans less heavily on decarbonising electricity over the rest of the decade than current plans imply, saying that could reduce the cost of meeting overall climate targets. That is likely to resonate with households facing persistent energy inflation, but it also underscores a familiar trade-off: the faster Britain pushes clean-power deployment without matching flexibility in demand and grid infrastructure, the higher the near-term cost can be.

Bobbie Upton, a research economist at the IFS and co-author of the report, said savings from time-varying tariffs would depend on how quickly households adapt, but would rise as EV ownership and automated technologies spread. That makes the reform more compelling over time than it is today. The near-term political hurdle is obvious: consumers dislike bill complexity and price uncertainty. But with electricity costs remaining elevated and system balancing costs climbing, pressure is likely to build for measures that let households benefit more directly from Britain’s growing surplus of cheap renewable power.