What is demand response? Demand response isn’t a new kid on the block. Operators of electricity networks have used it in various forms for several decades, with varying degrees of success. But it’s yet to become part of mainstream conversation—yet being the operative word.
As demand response becomes more important with the integration of renewable energy sources like wind and solar, and as rising grid demand puts greater pressure on power systems, Voltalis, the European leader in demand response technology, is about to change the conversation.
But let’s start at the beginning. To fully answer the question “what is demand response?” and understand how it works, it’s important to first understand how the flow of electricity works.
Why the energy system needs rethinking
As a resource, energy is quite unique. Unlike water, it can’t be stored (at least not on the grid) and must be generated and consumed at the same time. It’s therefore critical to ensure there is always a perfect balance between the inflow and outflow of energy on the grid at any time. When demand rises, supply must increase in real time to avoid outages.
Traditionally, when demand spikes during peak hours or supply drops (the sun doesn’t always shine and power plants don’t always work as intended), the grid calls on backup generation to balance the need. This often comes from polluting gas power stations, built specifically to satisfy peak demand and ramp up quickly. But this approach is both costly and inefficient.
This is where demand response comes in.
Demand response explained — and why it often fails
Demand response is used to balance supply and demand. Instead of just increasing generation during high demand – especially important when integrating renewable energy sources like solar and wind—demand response reduces overall electricity demand.
This can take the form of “loadshedding,” where grid operators reduce power to certain areas or industries temporarily. More recently, the responsibility has shifted to consumers, who are encouraged to change their electricity use during peak periods, either through incentives or time-based tariffs. This can include everything from industrial plants reducing usage to households delaying dishwasher cycles.
While simple in theory, these methods rarely work well in practice. Loadshedding disrupts daily life and operations, while consumer-led demand response requires active participation and constant monitoring. Engagement is low, and the savings are inconsistent.
The Voltalis approach: automation without compromise
What is demand response in a modern, automated context? That’s where Voltalis comes in.
As leaders in automated Demand Response, Voltalis optimises electricity consumption for consumers by reducing demand on the grid – minimising fossil fuel use and lowering energy bills, all without sacrificing comfort. The more homes and businesses that install our system, the greater the cumulative benefit.
Understanding what is demand response is key to modernising energy systems without overbuilding capacity. By aggregating small energy savings across thousands of buildings, Voltalis creates significant reductions in grid demand – at scale.
But what is the difference between traditional demand response and our version?
The short answer? Not much – and yet everything.
Instead of relying on users to monitor and adjust their electricity use—or worse, endure loadshedding—we automate it. Our smart systems work in the background, responding in real-time and optimising energy use without any inconvenience to the user.
This technology-driven model provides real-time, scalable flexibility that supports a more resilient, decarbonised grid. It’s free to users, easy to install, and has no impact on daily routines.
How our technology works in practice
We install small, discreet smart switches quickly and simply in properties where heating and cooling are controlled by electricity. Our system optimises the electricity consumption of each heating or cooling appliance connected to one of our switches by modulating the energy flow to each device during peak demand times in real-time, communicating the small reductions made with the grid. This pioneering approach is fully automated.
This temperature shift, while imperceptible to individual users, when conducted at scale across 200,000 residences or businesses, results in significant reductions in overall energy demand, easing pressure on the grid and reducing the reliance on costly and carbon-intensive power sources.
While our system works silently in the background, users have the additional benefit of being able to use our MyVoltalis App to control their radiators remotely, monitor their energy use, or switch the functionality off completely if desired. Simple, easy and convenient.
Free for users — because the system pays for itself
The sceptics among you are probably asking, “What’s the catch? Nothing’s for free?”
There isn’t one. Our solution is genuinely free for homeowners, landlords, housing associations, and commercial operators.
Why? Because we are compensated by grid operators for delivering flexibility and reducing reliance on backup generators. This business model means you benefit without paying a penny.
Our solution allows the electricity network to maintain grid stability while reducing costs and improving efficiency without resorting to fossil fuel power.
So, what is demand response in 2025? It’s no longer about inconvenience or compromise. It’s about doing nothing—and making a big difference.
With Voltalis, energy providers gain grid stability and lower costs, while users save money and help fight climate change without lifting a finger.
