IN Brief:
- Demand Flexibility Service events have delivered 4,739MWh of reduction since mid-April.
- Payments over the period totalled £777,800 through participating suppliers and aggregators.
- The service now supports year-round, zonal, and bidirectional flexibility from smaller assets.
The National Energy System Operator has procured 4,739MWh of electricity-demand reduction through the Demand Flexibility Service since mid-April.
The delivered volume is more than twice the 2,083MWh recorded during the equivalent period of 2025. Payments to participating electricity suppliers and aggregators totalled £777,800, with those organisations responsible for passing rewards through to the homes and businesses enrolled in their programmes.
During a single event on 9 July, participants delivered 233MWh of reduction between 5pm and 11pm at a cost of £47,288. Hot weather had lifted evening demand while solar generation fell away, increasing the requirement for additional system margin.
The service allows participating customers to reduce consumption or move it away from specified periods. Suppliers and aggregators combine individual changes into larger market units, submit bids, communicate event requirements, and calculate performance against an agreed baseline.
Demand Flexibility Service activity began during winter 2022/23 as part of preparations for a possible shortage of electricity margin, before moving from a seasonal emergency measure into a year-round service in November 2024.
The design expanded again in April 2026. Bidirectional flexibility now allows both demand reduction and demand increase, zonal procurement can direct activity towards particular parts of the system, and the minimum participation threshold has fallen to 0.1MW.
A primacy process manages interaction with other flexibility services, while a self-nominated baseline option accommodates intermittent renewable generation and industrial or commercial assets whose consumption is not well represented by a conventional historical profile.
Organisations seeking to participate can review the contractual material, provider process, and technical requirements on the Demand Flexibility Service portal.
Flexibility enters routine system operation
Summer delivery shows that demand response is no longer confined to winter evenings. Air conditioning, refrigeration, heating, charging, pumping, industrial processes, and commercial building systems create controllable load at different times of year, although the ability to shift each process depends on operating requirements.
Demand reduction has traditionally received more attention because it can lower peak requirements quickly. Bidirectional operation adds the ability to increase consumption when renewable output is abundant or system demand is unusually low, allowing electric-vehicle charging, hot-water storage, batteries, and some industrial processes to absorb energy during those periods.
Increasing demand is not beneficial everywhere because a national surplus can coexist with a local distribution constraint. Additional load on the wrong feeder may worsen network conditions, making zonal procurement and coordination with distribution operators increasingly important.
Location-specific flexibility is already moving to larger volumes, with a recent zonal procurement securing 700MW across defined areas of the system.
Baseline accuracy remains one of the more difficult commercial issues. Payment depends on the difference between expected and actual consumption, so the methodology must distinguish genuine response from normal variation caused by weather, production schedules, occupancy, behind-the-meter generation, or previous flexibility events.
Automation can improve repeatability. Smart chargers, energy-management systems, building controls, battery platforms, and industrial supervisory systems can respond to an event without relying on manual action at every site, although automated response still requires customer consent, override arrangements, communications resilience, and limits protecting comfort, production, and equipment.
Metering and data processing are equally important because providers must receive sufficiently granular data, assign it to the correct units, calculate baselines, manage missing values, and settle performance. As participation thresholds fall, the number of individual assets behind an aggregated bid can increase substantially.
The £777,800 paid over the reported period remains small beside the total cost of operating Britain’s electricity system. Its significance lies in establishing a repeatable resource that can compete with other balancing actions where it is efficient to do so.
Demand flexibility will continue to operate alongside networks, storage, interconnectors, and dispatchable generation. It can reduce the amount of rarely used capacity required for short peaks while increasing consumption when renewable output is abundant, and the latest results show that role extending through summer as well as winter.
