The plain-English guide
What is a virtual power plant?
A virtual power plant (VPP) is a network of smaller energy assets, batteries, EV chargers, heating, cooling and industrial machinery, coordinated by software so they act as one power station.
This guide explains how the aggregation works, why the grid pays, and how a UK business takes part.
How a virtual power plant works
On its own, a single chiller means nothing to the grid. Pooled with hundreds of other chillers, chargers and batteries, it becomes part of a dispatchable block measured in megawatts. That pooling is aggregation.
The operator forecasts how much flexibility the pool can deliver in each half hour, then bids it into the markets exactly as a power station bids its output.
Dispatch is the other half. When the system gets tight, software acts across the pool, inside rules each asset owner has set: a cold store drifts within its safe band, a battery discharges, EV charging pauses for an hour.
No single site does anything dramatic, but the grid sees one power station responding. Those tight periods show up plainly in the live UK wholesale prices a virtual power plant trades against.
Why does the grid pay? Supply and demand must balance every second, and asking thousands of assets to flex is cheaper and cleaner than firing up a peaking plant. With a VPP, the money goes to the businesses providing the balancing.
Virtual power plant vs traditional power station
Both can give the grid the same thing: dependable megawatts at the moment they are needed. How they get there is very different.
| Virtual power plant | Traditional power station | |
|---|---|---|
| Where the power comes from | Many small assets across many sites: batteries discharge, loads shift or shed, combined heat and power (CHP) steps in | One large generator on one site, usually burning fuel to meet the peak |
| What it takes to build | Software plus dispatch hardware on equipment businesses already own | Years of construction and heavy capital before the first unit of output |
| How it responds | Software dispatches the whole pool at once; dynamic services run on as little as 15 minutes' notice | A physical plant ramps up and keeps running for the whole peak |
| Carbon at the peak | Cleaner: demand turns down, or stored energy steps in, at the moment it matters | A peaking plant burns fuel to cover the spike |
| Where it sits | Distributed: factories, cold stores, depots and offices, anywhere with controllable load | Fixed to one connection point on the network |
| Who earns | The businesses whose assets take part, paid on a single monthly statement | The plant's owner |
How a business joins a virtual power plant
You do not build or trade anything yourself. You join an operator's pool, the model we run as a virtual power plant for UK businesses, and the operator handles the markets. Three steps:
- 01
Connect your flexible assets
We survey your sites and identify equipment that can flex without hurting operations. Dispatch hardware comes under our capex, with no upfront cost. The one firm requirement is half-hourly metering.
- 02
We register and operate
We register your sites into the Capacity Market, the Demand Flexibility Service (DFS) from NESO (the National Energy System Operator), and the tenders run by your distribution network operator (DNO). Our 24/7 control room runs every opt-in decision and dispatch, inside rules you set.
- 03
You get paid
Up to four revenue streams stack on the same megawatt hour; clients typically earn 3 to 6 times more than one scheme alone. DFS and DNO flexibility pay within 4 to 12 weeks of connection, on a single monthly statement.
Which assets take part
Anything that can shift by minutes, or shed for a short window, without hurting operations. Most of the flexible capacity in a VPP is ordinary plant: HVAC, refrigeration, compressors, pumping, batch processes and CHP.
- Battery storage
- EV charging
- HVAC
- Refrigeration
- Compressors and pumping
- Batch processes and CHP
Assets join from 10 kW, with half-hourly metering as the one firm requirement. Scale matters less than controllability: a 500 kW cold-storage warehouse in our programme earns around £15,000 a year by stacking the Capacity Market, the Demand Flexibility Service and its local flexibility zone.
For what each asset type can realistically earn, see our guide to battery storage and asset revenue.
Which markets pay a virtual power plant
A VPP earns from several markets at once: up to four revenue streams can stack on the same flexible megawatt hour.
- Capacity Market. Pays for being available: T-1 cleared at £20/kW/year for 2026/27 delivery, T-4 at £60/kW/year for 2028/29, with a 1 MW aggregated minimum.
- Demand Flexibility Service. NESO's scheme has run year-round since November 2024, dropped its floor to 100 kW per unit in April 2026, and cleared up to £1,290/MWh on the headline winter 2024/25 event.
- DNO flexibility. Crossed 9 GW contracted in 2025, typically earns around £50,000 per MW per year and accepts assets from 10 kW.
- Bill-side schemes. EII, NCC, BICS and the Climate Change Levy, the schemes that cut levies and network charges for eligible energy-intensive businesses. They reduce non-commodity charges rather than paying for events.
Stacked together, clients typically earn 3 to 6 times more than any one scheme alone. The full breakdown of what each market pays, and how the stacking rules work, is in our guide to demand side response for business.
Why virtual power plants matter now
NESO expects flexible capacity to roughly equal UK peak demand by 2030. That is the system operator saying, in public, that the grid intends to lean on flexibility at the same scale it leans on generation.
Virtual power plants are how distributed business assets reach that demand, and the businesses connected earliest earn for longest: DFS and DNO flexibility typically pay within 4 to 12 weeks of connection, while the Capacity Market runs on auction timetables and takes 5 to 17 months to first revenue.
Virtual power plant: the questions people ask
- Is a virtual power plant safe for my operations?
- Yes. You decide which equipment flexes, within what limits and hours, and production always takes priority. Events are opt-in, so a window that clashes with operations is simply declined. Most flexing is invisible: a cold store drifting within its safe band, or EV charging shifting by an hour.
- Do I need a battery to join a virtual power plant?
- No. Batteries are the most visible VPP asset, but any controllable load can take part: HVAC, refrigeration, compressors, pumping, batch processes, EV charging and CHP all qualify. DNO flexibility accepts assets from 10 kW, and the only firm technical requirement is half-hourly metering.
- Who runs the virtual power plant?
- The operator does, end to end. Purely Energy is the registered Capacity Provider, approved with every UK distribution network (UKPN, ENWL, SP Energy Networks, NGED, SSEN and Northern Powergrid) and with NESO at transmission level. Our 24/7 control room runs every opt-in decision and dispatch, with no broker handover and no aggregator middle-man, and revenue arrives on a single monthly statement.
- How big is a virtual power plant?
- There is no fixed size: a virtual power plant grows asset by asset. Assets join from 10 kW and the Capacity Market needs 1 MW aggregated, with operators pooling clients to clear it. UK DNO flexibility crossed 9 GW of contracted capacity in 2025, and NESO expects flexible capacity to roughly equal UK peak demand by 2030.
- Is a virtual power plant the same as demand side response?
- They overlap but are not the same. Demand side response is the action: shifting or shedding load when the grid asks. A virtual power plant is the structure that aggregates many assets doing demand side response, alongside storage and generation, so they can be bid into the markets as one unit. Joining a VPP is how most businesses access demand side response revenue.
Contracts, penalties, hardware and payback are covered in the full virtual power plant FAQ.
See what your own assets could earn
A no-obligation flexibility assessment names the markets your equipment qualifies for and sizes the revenue, before you commit to anything.