Summary

Britain's National Energy System Operator (NESO) runs a Demand Flexibility Service that pays households and businesses to cut or shift electricity use when the grid is under strain. Suppliers and aggregators alert customers with smart meters, verify how much power they avoid during an event, and pass on rewards funded by NESO. Launched in winter 2022 and made year-round in November 2024, the service has delivered over 12,000 MWh with about 2.46 million sign-ups. From April 2026 it can also pay people to use more electricity when clean power is abundant. The scheme is growing because variable wind and solar make balancing supply and demand harder and costlier. Benefits include lower system costs and small bill savings, but rewards are modest, smart meters are essential, and fairness for poorer households remains a concern.

Five Key Takeaways

  1. NESO pays households and businesses to cut or shift electricity use at peak times through the Demand Flexibility Service.
  2. Payments flow from NESO to suppliers and aggregators, who reward customers per unit of demand avoided during a flexibility event.
  3. The scheme matters because more wind and solar make it harder and costlier to keep supply and demand in constant balance.
  4. From April 2026 the service can also pay people to use more power when clean electricity is abundant, not only to use less.
  5. Individual rewards are modest and depend on smart meters, so flexibility complements rather than replaces new grid capacity and storage.

What Happened

Across Britain, a quiet shift in how the electricity system is run has turned ordinary households and businesses into active players in balancing the grid. Through the Demand Flexibility Service, run by the National Energy System Operator (NESO), consumers are paid to cut or reschedule their electricity use at moments when the network is stretched.

The idea is simple. When NESO expects demand to run close to available supply, it can call a flexibility event. Participating suppliers and third-party aggregators alert their customers, usually the day before or on the day, telling them which hour or two to avoid. People who power down during that window are rewarded for the electricity they did not use.

The mechanism relies on smart meters. Because these devices record consumption in half-hourly slots, a supplier can compare a household's usage during an event with what it would normally have used and calculate the reduction. NESO pays suppliers and aggregators for the total flexibility delivered, and they pass value back to customers as cash, credit or account rewards.

The service is no longer an emergency measure reserved for the coldest winter evenings. NESO made it a year-round tool at the end of November 2024, so it can be used whenever the system needs support. It has since delivered more than 12,000 megawatt-hours of flexibility, with around 2.46 million consumers and businesses signed up through their providers.

From April 2026 the service took a further step. Alongside paying people to use less at peak times, it can now reward them for using more electricity at moments when low-carbon power is abundant and cheap, a change approved by the regulator Ofgem in March. That two-way design marks a shift from crisis response to everyday system management.

Why It Matters

Keeping the lights on has always meant matching electricity supply and demand second by second. If the two drift apart, the grid frequency moves away from its target and, in the worst case, protective systems trip to prevent damage. Traditionally, operators managed this by turning power stations up or down. Demand flexibility adds a second lever: instead of only adjusting supply, the system can nudge demand.

That second lever is becoming more valuable as Britain's generation mix changes. Wind and solar now supply a large and growing share of the country's electricity, and both are variable. Output rises and falls with the weather rather than with a control-room instruction, so the job of keeping the system in balance has grown harder and, at times, more expensive.

Balancing costs are ultimately recovered from energy bills. When NESO has to pay generators to ramp up quickly, or to switch off wind farms because the network cannot carry their output, those costs feed through to consumers. Shaving peak demand, or moving it to windier and sunnier hours, can reduce the need for the most expensive last-minute actions.

There is a strategic dimension too. The previous government and now Andy Burnham's administration have committed to a near-fully decarbonised power system by 2030, a target long championed by Ed Miliband when he ran the energy brief. Meeting it without a smarter approach to demand would mean building far more back-up capacity and network reinforcement, at greater cost.

For households, the appeal is more immediate. Amid an energy-price shock intensified by the US-led conflict with Iran, being paid a few pounds to shift the dishwasher or delay charging an electric car offers a small but tangible way to trim bills. For businesses with flexible processes, the sums involved can be materially larger.

Detailed Analysis

To understand why paying people to use less power can make economic sense, it helps to look at how the service is built, how the money moves, and where its limits lie.

How the mechanism works in practice

The Demand Flexibility Service sits within NESO's wider toolkit for balancing the grid. NESO forecasts demand and available generation, and where it sees the margin between them narrowing, it can dispatch flexibility much as it would dispatch a power station. The difference is that the resource being called on is thousands of small reductions in consumption rather than a single large plant.

Suppliers and aggregators are the intermediaries. They enrol customers, deliver the alerts, verify the response against smart-meter data and settle payments. Well-known schemes include Octopus Energy's Saving Sessions, British Gas's PeakSave, EDF's Sunday Saver, Ovo's Power Move and offerings from Scottish Power and Utilita, alongside third-party apps that layer their own rewards on top.

Participation is voluntary and low-risk. A customer who signs up but does not cut back during an event simply earns nothing that time; there is no penalty. That design keeps the barrier to entry low, but it also means the volume of flexibility NESO can count on varies with how many people actually respond on any given day.

The turn-up capability added in April 2026 broadens the concept. Rather than only asking people to step out of the way at peak times, the system can invite them to soak up surplus clean power, for example on a blustery night when wind output is high. In effect, demand is being reshaped to follow renewable supply rather than the other way round.

Crucially, the resource is dispatched much like conventional generation. NESO treats the aggregated response as a merit-based margin tool, weighing its cost and reliability against other actions available in the control room. When flexibility is cheaper than paying a gas plant to run or a wind farm to switch off, it can be called; when it is not, it simply stays in reserve. That competitive framing is what keeps the mechanism honest and keeps a lid on the cost to bill-payers.

Why flexibility grows with renewables

A grid dominated by gas and coal was relatively straightforward to balance: fuel could be stored and burned on demand, and plants ramped to order. A grid dominated by wind and solar behaves differently. Generation is cheap once built but cannot be summoned at will, so the challenge moves from producing enough energy to matching a fluctuating supply with a fluctuating demand.

This creates both problems and opportunities. On calm, cold evenings when demand peaks and wind fades, the system leans on expensive back-up and every avoided unit is valuable. On windy, mild nights, Britain can generate more clean power than it can use or move, and operators sometimes pay wind farms to switch off. Flexibility helps on both counts, trimming the peaks and filling the troughs.

Electrification sharpens the trend. As more heating and transport shift from gas and petrol to electricity, through heat pumps and electric vehicles, peak demand could climb and become spikier. Yet many of those same devices are naturally flexible: a car or a hot-water tank does not care whether it charges at six in the evening or two in the morning, provided it is ready when needed.

That is why policymakers increasingly treat demand flexibility as core infrastructure rather than a novelty. A government clean-flexibility roadmap frames it as a way to integrate renewables at lower cost, reducing how much generation and network capacity must be built solely to cover a handful of extreme peak hours each year.

The economics are compelling because peak capacity is expensive to provide and rarely used. A power station or grid upgrade sized for the highest few hours of the year sits idle for most of it, yet its cost is spread across all consumers. Every megawatt of demand that can be moved off those peaks is a megawatt of capacity that need not be built, financed and maintained, which is why even modest reductions carry outsized value at a system level.

Benefits, limits and the fairness question

The benefits are real but bounded. Flexibility can lower system balancing costs, reduce the need for the dirtiest and priciest back-up plants, and defer some network upgrades. Because those costs sit on everyone's bills, savings can, in principle, be shared broadly rather than captured by participants alone. It also gives households a rare lever over an otherwise fixed expense.

The limits are equally clear. Individual rewards are modest; consumer guidance is blunt that a typical household should not expect more than a few pounds per event, and certainly not hundreds of pounds. The value at a system level comes from aggregation, from millions of small actions adding up, rather than from any single home making a dramatic difference.

There are practical constraints too. The service depends on a working smart meter, and households without one, or with a meter operating in a non-communicating mode, are effectively locked out. The amount of flexibility available is also weather-dependent and behavioural: it cannot be relied upon like a contracted power station, which is why it complements, rather than replaces, firm capacity, storage and interconnection.

Fairness is the sharper question. Those best placed to benefit tend to be homeowners with electric cars, batteries or flexible appliances, who are often already better off. Critics argue that without careful design, flexibility rewards could widen rather than narrow the gap, unless schemes are made accessible to renters, lower-income households and people less able to shift when they use power.

What Happens Next

Demand flexibility is set to expand rather than fade. NESO has already moved the service from a winter stopgap to a year-round, two-way tool, and its own planning assumes flexible demand will play a steadily larger role in balancing the system through the rest of the decade as renewables and electrification advance.

The bigger prize lies in automation. Much of today's participation still relies on people reacting to an alert. As smart tariffs, connected appliances, home batteries and vehicle chargers become more common, the response can increasingly happen in the background, with devices shifting their own consumption in response to price and grid signals without the household lifting a finger.

Regulation and consumer protection will shape how far it goes. Ofgem's approval of the reformed service is one milestone, but questions remain about how rewards are set, how customers are protected as third-party apps proliferate, and how to ensure the benefits reach beyond the most affluent, tech-enabled households.

It also sits within a wider debate about the resilience of Britain's electricity system. NESO's ability to avoid blackouts is under growing scrutiny as the grid decarbonises, and flexibility is one of several tools, alongside storage, interconnectors and new network capacity, that will determine whether that transition is smooth or bumpy.

For the new government, the politics are favourable. A policy that pays households money and supports the clean-power goal aligns neatly with Burnham's stated focus on cost-of-living relief. Expect ministers to promote demand flexibility as a practical, bill-cutting complement to their broader energy strategy.

Conclusion

Paying people to use less electricity can sound counter-intuitive, but it reflects a genuine shift in how a modern grid is run. As Britain leans harder on wind and solar, the value of being able to move demand around, rather than only adjusting supply, rises accordingly.

The Demand Flexibility Service is not a silver bullet. Individual payments are small, participation depends on smart meters and willing behaviour, and questions about fairness are unresolved. It works because millions of modest actions aggregate into something the system operator can actually use.

Its direction of travel is clear. From an emergency winter measure it has become a permanent, two-way part of the balancing toolkit, and automation should make it easier and more valuable over time. For households, it offers a rare chance to shave a bill; for the country, a cheaper and more resilient path to a cleaner grid as coal fades and wind and solar take its place.

The task now is to make it work for everyone, not just those with an electric car in the drive. If demand flexibility can be extended fairly across the population, it will stand as one of the quieter but more useful innovations in Britain's energy transition.