What Is Demand Side Response - And Can Your Business Get Paid for It?

The UK electricity grid runs on a tighter balance than it used to. Wind and solar have transformed the generation mix, but they don’t run to a schedule, which means the gap between what’s being generated and what’s being consumed has to be managed constantly.

Demand side response (DSR) is one of the tools grid operators use to manage that balance, and it pays businesses to participate.

For businesses with significant electricity consumption, DSR turns operational flexibility into a revenue stream, In most cases, no capital investment is required.

What Is Demand Side Response?

Demand side response (DSR) is a mechanism whereby energy-consuming businesses agree to reduce or shift their electricity consumption at specific times, in response to signals from the grid or from a specialist aggregator. In return, they receive payments, either for the capacity they make available, or for the actual energy reduction they deliver.

The National Grid Electricity System Operator (NESO) relies on DSR as a key tool for balancing supply and demand in real time.

When more electricity is being generated than consumed, or vice versa, NESO can call on DSR participants to adjust their load, helping to keep the grid stable without having to bring expensive peaking plant online.

As renewable generation grows, so does the need for flexible demand-side resources.

DSR used to be the preserve of the very largest industrial consumers. The market has matured, aggregators have lowered entry thresholds, and it’s now a realistic option for mid-sized commercial and manufacturing businesses.

How Does DSR Work in Practice?

Most businesses participate in DSR through an aggregator, a specialist company that bundles together the flexible demand of multiple sites and offers it to NESO as a single, manageable resource.

The aggregator manages the technical and commercial relationship with the system operator, and shares the resulting revenue with participating businesses.

When a demand reduction signal is issued, the business is expected to reduce its consumption by an agreed amount within a specified response window.

What that looks like in practice depends on the site:

• A cold storage facility might allow temperatures to drift slightly, temporarily suspending refrigeration compressors

• A manufacturer might pause a production line or defer an energy-intensive process by an hour

• A commercial building might reduce HVAC loads during the response period

• A business with on-site battery storage might discharge during the event window

Response events typically last between a few minutes and an hour. Flexibility is agreed in advance, you know exactly which assets you’ll curtail and by how much before you sign up, so there are no operational surprises.

Who Can Participate in DSR?

DSR has historically been associated with large energy-intensive industries, but the market has matured considerably. Smaller commercial and industrial businesses are increasingly eligible, particularly those with:

• Electricity demand of 100kW or above (half-hourly metered)

• Flexible or deferrable loads – refrigeration, HVAC, pumping, manufacturing processes, EV charging

• On-site battery storage or standby generation

• Smart metering capable of providing half-hourly consumption data

The practical minimum for most formal DSR programmes is around 100kW of flexible capacity.

Aggregators can bundle smaller sites together into a virtual pool. If you’re below 100kW, it’s still worth asking, you may have more options than you’d expect.

Types of DSR Programme in the UK

Several distinct DSR products are available in the UK market, each suited to different types of business:

Frequency Response Services – The fastest-acting products, operating in under a second to two seconds. Dynamic Containment, Dynamic Moderation, and Dynamic Regulation are the main products here. These typically require automated control systems (such as battery storage) and suit sites that can respond without human intervention.

Short Term Operating Reserve (STOR) – A slower-response product, with assets available within four hours of notification. Better suited to larger industrial loads that need advance warning before curtailment. STOR events tend to be infrequent but reasonably well-paid.

Capacity Market – Businesses can register flexible capacity in the annual Capacity Market auctions run by NESO. Participants receive capacity payments simply for committing to be available during system stress events, whether or not they are actually called upon. This is the most predictable DSR revenue stream.

Balancing Mechanism – A more advanced route, typically accessed by larger sites or aggregators managing significant portfolios. Participants submit bids and offers to NESO in real time to increase or decrease consumption.

How Much Can Businesses Earn from DSR?

Revenue depends on which programme you’re in, how much flexible capacity you have, and how often you’re dispatched. Indicative figures for UK businesses:

• Frequency response services: £30,000-£80,000+ per MW per year, depending on the product and market conditions

• Capacity Market: £20,000-£50,000 per MW per year for committed availability

• STOR: Variable, typically lower per-MW than frequency response but with a predictable availability component

For a business with 500kW of genuinely flexible load, a well-structured DSR arrangement could generate £15,000-£40,000 per year in additional revenue, without requiring significant capital investment.

Sites with battery storage can often access the higher-value frequency response products, improving the return further.

Getting Started with DSR

The starting point is an honest assessment of what flexible capacity your business actually has. This means:

• Identifying which loads can be reduced or deferred, and for how long, without unacceptable operational disruption

• Checking whether your metering is capable of providing half-hourly data (a requirement for most programmes)

• Engaging one or more aggregators to assess your site’s eligibility and model potential revenue

• Agreeing terms, completing any necessary metering upgrades, and registering assets

Most aggregators assess sites for free, their revenue depends on you participating. Get quotes from more than one; commercial terms vary and it pays to compare.

How Catalyst Can Help

Catalyst works with businesses across the UK on energy procurement, demand side response and cost management. If your business has significant electricity demand, DSR could reduce what you pay and generate additional revenue from flexibility you already have.

We can help you understand whether demand side response is a realistic option for your site and point you towards the right specialists to take it further.

Further reading: Market-wide Half-Hourly Settlement (MHHS) covers the settlement reform that makes the timing of your consumption far more visible, and more valuable. It is the same shift that strengthens the commercial case for demand side response.

Speak to Catalyst about demand side response →