Integrate Once. Access Everything.
A single, standards-compliant flex integration spanning many OEM fleets. No vendor lock-in, no bespoke integrations.
12 GW
Consumer Flex by 2030
£5.2B
UK Flex Market
3.8M
Connected Devices by 2030
The Challenge
Bespoke integrations don't scale.
Today's flex providers must build and maintain dozens of separate integrations across OEM device types. The result: high cost, low coverage, fragmented data, and unpredictable device performance.
Integration Sprawl
Separate integration per OEM. Every device type, protocol, and API is a new project.
Fragmented Data
Inconsistent telemetry, varied reporting formats, and no unified fleet visibility.
High Cost per OEM
Each new OEM partnership requires upfront engineering investment plus the ongoing cost of maintaining poorly documented, inconsistent point-to-point APIs.
Low Fleet Coverage
Limited device support means untapped flexibility capacity and missed revenue.
How It Works
One integration for all device categories.
WattStack Flex provides a single, standards-compliant integration layer spanning many OEM fleets — so you can focus on grid operations, not device plumbing.
Connect
Single standards-based integration. We support protocols like OpenADR 3.1, OCPP 1.6/2.1, and others — and are actively mapping to more. Access EV chargers, heat pumps, batteries, thermal storage, and other energy devices across all partner OEMs.
Control
Deterministic arbitration ensures mandatory DR events are always fulfilled. Advisory events with user override. Fleet event spreading prevents rebound peaks.
Monetise
Transparent 20% flex provider revenue share across both tiers. Grid services (DSR) revenue with clear settlement handling.
Scale
Infrastructure scales to hundreds of thousands of devices. Fault-tolerant telemetry with automatic reconnection. Multi-connectivity failover across WiFi, Ethernet, and Cellular.
Compliance & Arbitration
Built for the real world.
WattStack's arbitration engine resolves conflicts between flex instructions, OEM safety limits, and user preferences — deterministically and transparently.
Smart Arbitration
- Mandatory DR events are always fulfilled to the extent safety permits.
- OEM safety limits (compressor rest, temperature thresholds, min SoC) are never overridden.
- Advisory events support user boost override per UK Smart Energy Code.
- OEMs and users can set how aggressively flex events are applied — from prioritising grid response to preserving user comfort.
Regulatory Compliance
- UK Smart Energy Code aligned — user boost mechanism built in.
- Fleet event spreading (jitter) prevents rebound peaks. Shrink-only rule respects user window boundaries.
- Settlement variability handling for both rapid and delayed settlement windows.
- OpenADR 3.1 and OCPP 2.1 standards-based reporting.
Revenue Model
Aligned revenue sharing.
Every stakeholder earns from flexibility revenue — end users, OEMs, flex providers, and WattStack. A transparent model where incentives are aligned across the entire value chain.
End User
Largest share — the asset owner always earns the most
Flex Provider
Earn from every dispatched device in your portfolio
OEM
Recurring revenue from hardware already in the field
WattStack
Platform fee — aligned so every stakeholder benefits from growth
£67.78
DSR Revenue / Device / Year
Blended grid services revenue across device types
£117.78
Projected Revenue / Device / Year
Projected blended DSR + carbon credit revenue as WattStack Impact launches
Device Coverage
Every device category, one integration.
Access flexibility capacity across the full range of connected energy devices through WattStack's universal standards-native platform.
EV Chargers
930K today → 3M by 2030
Heat Pumps
320K today → 1.8M by 2030
Home Batteries
80K today → 695K by 2030
Thermal Storage
16M cylinders installed, growing
Electric Radiators
1.7M homes with electric heating
Thermostats
10M+ smart thermostats installed
Market Opportunity
The flexibility market is accelerating.
Policy drivers, growing device volumes, and regulatory unlocks are creating unprecedented opportunity for flex providers. WattStack's role is to make the integrations that underpin this growth reliable, open, and simple — so the market can scale and users can be rewarded for supporting the grid in staying reliable and stable.
3×
Consumer Flex Growth
4 GW today to 12 GW by 2030
45%
Heat as Clean Flex
Heat pumps as % of 2030 clean flexibility
3.8M
Connected Devices by 2030
Up from 370K today
Ready to simplify your integration?
Talk to our team about accessing OEM fleets through a single standards-compliant integration.
Get WattStack