Great Britain’s electricity market is undergoing rapid transformation. Renewable generation is growing, coal has exited the system, gas-fired generation is increasingly exposed to changing utilisation patterns, and electricity demand is becoming more dynamic as transport, heat, industry and digital infrastructure electrify.

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These shifts are reshaping the revenue landscape for battery storage, flexible load and onsite generation. The opportunity is significant, but the value is no longer captured by simply owning an asset. It is captured by operating that asset well.

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Frequency response remains important, but value is becoming more competitive

For many battery projects, frequency response was once the core revenue stream. Services such as Dynamic Containment helped create a strong early market for fast-response battery assets. Today, NESO’s Dynamic Services suite includes Dynamic Containment, Dynamic Moderation and Dynamic Regulation, which together help control system frequency within operational limits.

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However, as more battery capacity enters the market, frequency response revenues are becoming more competitive. That does not mean the opportunity has disappeared. It means the strategy needs to evolve.

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High-performing assets must now be able to move intelligently between frequency response, balancing, wholesale optimisation, capacity mechanisms and local flexibility opportunities. A single-service approach is increasingly unlikely to maximise value over the life of the asset.

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Wholesale volatility and negative pricing are increasing the arbitrage opportunity

As renewable output grows, the wholesale market is becoming more volatile. Periods of high wind or solar output can push prices very low or negative, while system stress, low renewable output or local constraints can create high-value scarcity periods.

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This creates a strong use case for batteries and flexible demand. Batteries can charge when prices are low and discharge when prices rise. Flexible loads can shift consumption into lower-value periods or reduce demand when the system is under stress.

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Negative pricing is already becoming a more visible feature of the GB market. Montel reported that Q2 2025 saw 112 negative price hours, up from 106 in the same quarter of 2024.  More recently, the Financial Times reported a major negative-price event linked to high wind output, with negative prices expected for 17 hours during Storm Amy.

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For asset owners, this volatility is not just a risk. With the right optimisation, it is a revenue opportunity.

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Flexibility markets are becoming more structured

The UK market is also moving toward a more coordinated flexibility framework.

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NESO’s Demand Flexibility Service has evolved to support year-round use and unlock new opportunities for businesses and consumers through energy suppliers and third-party aggregators.  NESO also states that from April 2026 the service expanded to include bi-directional flexibility, covering both demand turn-up and demand turn-down, with zonal procurement and a reduced eligibility threshold of 0.1 MW.

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At the same time, Ofgem has appointed Elexon as Market Facilitator to align local and national flexibility market arrangements, reduce friction, increase liquidity and unlock the full value of flexibility.  Elexon’s first delivery plan covers DNO flexibility services, most NESO ancillary services and the Balancing Mechanism.

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This matters because the value stack is broadening. Batteries and flexible loads may be able to access value through frequency response, the Balancing Mechanism, wholesale optimisation, Capacity Market participation, DNO flexibility services, DFS and supplier-led optimisation. The commercial challenge is knowing which market to prioritise, when to move, and how to avoid conflicts between revenue streams.

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Why co-optimisation is no longer optional

In a more complex market, single-market strategies leave value behind.

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A battery committed entirely to one frequency response service may miss a high-value wholesale or balancing opportunity. A flexible load focused only on site savings may miss a paid flexibility event. A generator used only for backup may miss capacity or reserve-style value.

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True co-optimisation brings these choices together into one strategy. It weighs market prices, asset state, operational constraints, site requirements, capacity obligations, network signals and compliance rules in real time.

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That is the difference between a static schedule and an intelligent operating strategy.

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PowerSync’s advantage: dynamic, intelligent and market-ready

PowerSync’s platform is built to identify and act on the highest-value opportunities across multiple markets in real time.

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Our technology coordinates batteries, flexible loads and onsite generation across site-level and market-level value streams, including:

• frequency response and other balancing services;
• wholesale and imbalance price optimisation;
• Capacity Market and reserve-style opportunities;
• DNO flexibility services;
• demand flexibility and load shifting;
• site demand reduction and energy cost savings;
• onsite generation and battery dispatch.

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PowerSync’s Edge, Cloud and Market platform is designed to ensure assets perform within agreed operational limits while responding to live market and grid conditions. That means dispatch decisions are not based on idealised assumptions. They reflect real constraints: state of charge, availability, ramp rates, site requirements, operating envelopes, metering, supplier arrangements and compliance obligations.

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The takeaway

Great Britain’s electricity market is becoming more volatile, more flexible and more competitive. As more batteries and flexible assets connect, value will increasingly shift from simple participation to precise orchestration.

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In this market, the winners will not simply be those with installed capacity. They will be the asset owners and operators that can capture more value from each megawatt, across more markets, more often.

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PowerSync helps businesses turn batteries, flexible loads and onsite generation into earning assets - maximising value across the full market stack while protecting core operations.

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