Turn flexibility into revenue.
Joulen Flex gives you a complete route to market for flexible assets, combining optimisation, trading and expert management to unlock new revenue without the operational complexity
We optimise. We trade. You earn.
Make more from every flexible asset
Flexible assets create opportunities beyond simply storing energy for later use.
Joulen Flex connects eligible flexible assets, batteries and EV chargers alike, to our optimisation and trading capability, helping identify and capture additional value from their flexibility.
We manage the complexity behind the scenes, giving you a simple way to add flexibility to your proposition and create more value from the assets you deploy.
Who is Joulen Flex for?
Installers
Add intelligent flexibility to the assets you install, giving customers the opportunity to generate more value from them.
For installersEnergy companies
Extend your energy proposition with flexibility and trading capability without having to build your own market infrastructure or trading operation.
For suppliersOEMs
Add flexibility and optimisation capability to your hardware, helping you offer customers more value from their energy assets without developing your own trading capability.
For OEMsGrowing portfolios
Whether you're managing residential assets or growing a commercial portfolio, Flex provides a scalable and speedy route to market.
For developers
How it works
Connect
Bring eligible flexible assets into the Joulen platform.
Optimise
We assess asset availability, operating requirements and market conditions to identify the best opportunities for your portfolio.
Trade
Our algorithms and trading team manage participation across eligible markets, responding to changing market conditions.
Earn
The value generated through flexibility and trading creates an additional revenue opportunity from your assets.
The benefits of Flex
More value from your assets
Unlock additional revenue opportunities from flexible assets beyond their primary use.
A complete service
Optimisation, market participation and trading are brought together in one service.
No trading infrastructure to build
Access Joulen's technology, market capability and trading expertise without developing your own operation.
Built to grow with you
Connect more assets as your portfolio develops, with a service designed to scale alongside your business.
Flex, Trade or Grid?
Different assets and business models need different routes to market. Joulen's solutions are designed around where you are in the flexibility value chain.
| Feature | FlexComplete flexibility as a service | TradeMarket access & trading | GridOptimisation of grid-scale assets |
|---|---|---|---|
| For | Installers, energy companies & OEMs | Aggregators, HEMS & EMS providers | Grid-scale asset owners & developers |
| Typical assets | Residential & commercial batteries | Aggregated flexible portfolios | Large-scale batteries & co-located portfolios |
| Optimisation | Yes | Yes | Yes |
| Market access | Yes | Yes | Yes |
| Trading | Yes | Yes | Yes |
| Algorithmic bidding | Yes | Yes | Yes |
| Trade desk execution | Yes | Yes | Yes |
| Best suited to | Adding flexibility to your customer proposition | Bringing aggregated flexibility to market | Optimising larger-scale assets |
| Explore Flex | Explore Trade | Explore Grid |
What could your assets earn?
Every portfolio is different. Get an indicative revenue calculation based on your assets and see what your flexibility could be worth.
What kind of site?
5 kW inverter, matched to the system, the smallest that covers the array.
Electricity use2,700 kWh a year
Every figure comes from full-year, half-hourly modelling of the Joulen Flex dataset. Figures are indicative and depend on your tariff, site and market conditions.
Total annual benefit with Joulen Flex
£1,522/ year
Bill today £688. Grid supply costs covered, with £834 a year in profit.
- Solar and battery on their own
- £961
- Joulen Flex adds (optimisation + trading)
- £561
- Solar alone
- £784
- Adding the battery
- £177
- Smart optimisation
- £423
- Market access (trading)
- £138
- Battery cycles (optimiser output)
- 385/yr · 1.1/day
- Solar used on site
- 69%
- Modelled demand
- 2,700 kWh / yr
Includes solar stored in the battery for later use, not only generation used the moment it is produced.
Indicative only, not a guarantee of revenue. A Joulen expert validates against live market data for your assets.
Assumptions and sources
- Every position is a full-year, half-hourly model from the Joulen Flex calculator dataset v3 (2,925 models). Home positions are exact; commercial positions between modelled battery-to-solar ratios are interpolated.
- Home figures include VAT and use Octopus Flux (region E, August 2026 rates). Commercial figures exclude VAT and use an indicative half-hourly commercial tariff.
- Trading revenue is settled against observed 2025 GB day-ahead prices.
- Weather is a PVGIS typical year for Birmingham; demand follows Elexon profile shapes scaled to the chosen level.
- Standing charges are excluded because they do not change with the system. Battery degradation is not modelled and cycling is not limited.
Model flex-dataset-v3-2026-09-03.
Flex FAQs
Installers, OEMs and suppliers serving residential and small-commercial customers who want optimised, flexible home energy.
Yes, the optimisation and customer app can run entirely under your brand.
No, Flex works with the batteries and inverters you already install.
Ready to unlock more value from your batteries?
Talk to Joulen about how Flex can help you optimise, trade and maximise the value of your flexible energy assets.