Every energy device. Intelligent.
Integrate once with an interoperable, standards-native stack with no lock-in. Control runs on the device itself.
Regulatory direction is clear.
2027
UK energy smart appliances are expected to face minimum security and interoperability requirements, with the load control licence in force by the end of 2027.
DESNZ / Elexon Smart Secure Electricity Systems programme
5M
Homes the UK plans to upgrade with heat pumps, solar, and batteries by 2030, backed by £15bn of public investment.
DESNZ Clean Flexibility Roadmap, July 2026
66 GW
Clean flexible capacity the UK grid could need by 2030, roughly tripling the 24 GW of 2023, with a growing share coming from homes and small devices.
DESNZ Clean Power 2030 Action Plan
WattStack is building energy devices to be flex ready and to meet the security and interoperability requirements coming into force.
How it works
Smart hardware from £20 that makes energy devices grid-ready.
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Add the Edge
Connect an energy device to WattStack Edge hardware, describe the device's capabilities with the guided SDK, and the device gets the connectivity, security, and compliance that makes it grid-interoperable.
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Connect the cloud
The device automatically connects securely through the Edge to the WattStack cloud. Device owners control it in the App and manufacturers or fleet operators can manage it in Control Room.
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Optimise, flex and share
Flexibility providers and optimisers can control mixed fleets of devices through a single documented, standards-native public API, and the value earned is shared along the chain.
Adopt what you need.
- Start with EdgeOr use one of our preconfigured options: Hub, Display, or Adapter Board, to make a device secure and interoperable.
- Add cloud services and flex when you are readyThe white-label user App and Control Room add flex-native cloud capabilities when you want them, with no forced bundling.
- from £20
- per Edge module
- from 25p
- per device per month platform fee
- £0
- to pilot
Who it is for
Making smart energy simple.
For manufacturers
Ship connected, compliant hardware without building the software company behind it. You write the device code; our infrastructure brings connectivity, security, and compliance, plus an App and Control Room to deliver the smart functionality your users expect.
Integrate in weeks →For fleet operators
Run mixed estates of heat pumps, cylinders, batteries, and EV chargers from one screen in WattStack Control Room. See device health and maximise yields across the sites you manage.
Your connected estate on one screen →For flexibility providers and optimisers
Integrate once to dispatch fleets from many manufacturers and device types through a single, standards-native interface, with per-device constraints handled locally and revenue shared transparently.
One integration. Every fleet →For device owners
The WattStack App makes energy devices smart and simple to control and, if owners choose, earns them money by participating in the energy grid via flexibility. A manufacturer can ship it white-labelled under its own brand, and it has a free tier.
What is WattStack? →WattStack Edge
Security enforced in hardware.
Energy device firmware runs on a dedicated sandbox processor with no internet access, operating via a separate secure coordinator that inspects every message. A compromised driver cannot reach the network directly, and the impact of a breach is bounded to that one device.
Patent pending architecture with isolation enforced by the hardware layout, without requiring software trust.
The security boundary →Control from the device.
Software-only integrations
Cloud API integrations stack on someone else's logic.
Software-based architectures pass control through the manufacturer's cloud and depend on firmware features neither written nor inspectable by the integrator. Behaviour varies by model, so reliability is inherited rather than engineered.
Hardware at source
Behaviour controlled and abstracted at the device.
WattStack is hardware-based, controlling devices directly and caching data and error handling where it's cheapest and most efficient to do so. Abstracting and consolidating device behaviour at source means operating an energy device no longer depends on firmware features that cannot be seen or verified.
Interoperable by architecture.
WattStack is built by engineers for engineers, centred around open energy standards. The Edge SDK and public API are designed to make device and cloud-to-cloud integration straightforward.
Builds on open standards
# read a device's latest state curl https://api.wattstack.io/api/v1/devices/dev_hp_01/state \ -H "Authorization: Bearer $WS_TOKEN" # → keyed by descriptor point id: { "21": { "value": 1850, "measured_at": "..." } } # set a control point by id, in display units (needs an active takeover) curl -X POST https://api.wattstack.io/api/v1/devices/dev_hp_01/control \ -H "Authorization: Bearer $WS_TOKEN" \ -H "Content-Type: application/json" \ -d '{ "values": { "12": 45 } }' # → accepted · queued and safety-clamped at the Edge
Let's build a smarter grid.
Piloting across heat pumps, thermal storage, and battery storage now.