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Generate additional revenue from your existing heat pumps, electric boilers, and thermal storage while continuing to deliver reliable heat to customers.

 

The Enel X Virtual Power Plant makes that practical: one platform that connects, optimises and monetises the assets you already run.

What does flexibility mean for a heat network?

Flexibility means controlling when your assets draw or generate electricity. 

 

Heat pumps, electric boilers  and thermal storage can run when power is cheap, clean or abundant, and pull back when the grid is tight. Done well, the heat network becomes a shock absorber between the electricity system and heat demand.

 

That capability is becoming increasingly valuable, especially as variable wind and solar, local network constraints, and electrified heat reshape how the system is balanced. Heat networks are unusually well placed to provide part of it, because they combine large electrical loads, controllable generation and thermal storage in a single system, behind a single operator.

 

For an operator, flexibility shows up as demand side response, market participation, and smarter purchasing, but not as a change to the service customers receive.

Which heat network assets can provide flexibility?

Most heat networks already have the assets needed to participate in flexibility markets. The difference is how those assets are controlled and optimised.

Heat network assets

Heat pumps

Heat pumps can adjust electricity demand in response to market signals while maintaining heat supply, particularly when paired with thermal storage.

Electric boilers

Electric boilers can absorb low-cost or surplus renewable electricity and convert it into stored heat, allowing the network to reduce electricity use during peak periods.

Thermal storage

Thermal storage decouples heat production from demand, allowing assets to respond to market signals without affecting customer comfort. It is the key enabler of flexible heat networks.
District heating pipe network in an underground utility tunnel

Which GB flexibility markets can a heat network access?

Depending on your assets and operating profile, your heat network may be able to participate in the Capacity Market, NESO balancing services, DSO flexibility, wholesale markets and other flexibility opportunities. Our Virtual Power Plant automatically optimises your assets across the right markets at the right time.

How the Enel X Virtual Power Plant manages it

Our Virtual Power Plant connects your assets, optimises when they operate and automatically participates in the most valuable flexibility markets while managing dispatch, metering and settlement.

The same platform already manages 10 GW of flexible capacity across 100 programmes in 14 countries. You can see how it works with UK industry in our Carlsberg Britvic case study.

Protecting your heat customers

Heat supply always comes first. Thermal storage enables flexibility without affecting customer comfort, and every dispatch respects the operational limits agreed with you. 

 

If delivering heat ever conflicts with market participation, heat delivery always takes priority. That principle is built into how the portfolio is scheduled, not added as an afterthought.

 

Engineers reviewing operational data at an industrial energy facility

How flexibility can strengthen the investment case

Flexibility is not only an operating revenue; it can strengthen the commercial case for investment. Flexible design can:

  • reduce peak plant sizing
  • reduce connection capacity and grid reinforcement costs
  • diversify income beyond heat sales
  • make operating costs more predictable.

Designed-in flexibility can make better use of a lower-capacity grid connection, which matters wherever connection or reinforcement costs constrain a scheme. It also aligns naturally with the outcomes that capital programmes such as the Green Heat Network Fund (GHNF) and the Heat Network Efficiency Scheme (HNES) are built around: cost-effectiveness, efficient use of electrified heat, resilience and long-term value.

 

What we need to model your network

A flexibility assessment starts with a picture of what your network runs on and how it operates. 

 

We'll typically ask for:

  • Asset inventory
  • Heat demand profile
  • Grid connection details
  • Operational constraints.

 

Don't have all this yet? That's fine. We can also support projects at the feasibility stage.

Insulated district heating pipes prepared for installation

Contact our UK flexibility team

Whether you run an established network or are planning one, the next step is the same: a conversation about your assets, your constraints, and where flexibility could take them.

Frequently asked questions

Can a district heating scheme take part in the Capacity Market?

Yes. A heat network can participate where its assets can reliably reduce demand or generate during system stress events. Storage-backed heat pump turn-down, electric boiler load reduction, output can all qualify in principle; each site is assessed against delivery, metering and telemetry requirements before entering.

 

Will flexibility affect my heat customers?

No, not when the scheme is designed and controlled properly. Thermal storage supplies heat while assets respond to market signals, so flexibility changes when heat is produced rather than whether it is delivered. Comfort limits and operating constraints are agreed in advance and enforced automatically in dispatch.

 

How big does a heat network need to be to provide flexibility?

There is no fixed threshold. What matters is how much controllable electrical load or generation the network has, and how much thermal storage backs it. Aggregation through a Virtual Power Plant also allows smaller schemes to participate alongside other assets, reaching markets they could not enter alone.

 

Do I need thermal storage to provide flexibility?

Not strictly, but storage usually separates marginal value from material value. A correctly sized thermal store decouples heat production from demand for several hours, extends how long assets can respond to price and grid signals, and protects customers throughout. Networks without storage typically have far less freedom to shift generation.

 

District heating pipe network in an underground utility tunnel