Octopus Flux is a time-of-use import and export tariff built for UK homes with solar panels and a battery, giving you a cheap overnight charge window between 02:00 and 05:00 and a high-value export window between 16:00 and 19:00. It suits homeowners who can either schedule their own battery charging or who want Octopus to automate it for them through Intelligent Octopus Flux.
TL;DR:
- Octopus Flux’s peak export rate during the evening window has reached up to 27p per kWh, making it highly competitive within the Smart Export Guarantee tariffs.
- Automated Intelligent Flux works only with specific batteries, including Tesla Powerwall and SolarEdge, and simplifies daily scheduling but limits control to the system’s algorithm.
- Eligibility requires a compatible smart meter, export MPAN, and removal from deemed export arrangements; installation faults or regional delays can hinder switching.
- The tariff’s core advantage is optimizing solar and battery use for cheaper overnight charging and profitable evening exports, especially if system size and regional wholesale prices favor this approach.
- Proper professional setup can improve safety, ensure compatibility, and help maximize returns, with DIY options only viable for simple, well-documented systems.
Table of Contents
- How Octopus Flux works: tariff structure and daily price windows
- Intelligent Octopus Flux versus standard Flux: automation and compatibility
- Eligibility, setup and the steps to switch
- Practical benefits, realistic returns, and who should switch
- How an installer supports a safe switch to Flux
- Is Flux a good long-term choice for UK homeowners?
- Getting your system Flux-ready with Smart Home Technical Ltd
- FAQ
- Sources
How Octopus Flux works: tariff structure and daily price windows
Flux splits each day into three pricing periods rather than charging a flat rate around the clock. Between 02:00 and 05:00, import prices drop to their cheapest point, which is when your battery should be pulling power from the grid rather than your solar panels, since there is none to draw from at that hour. Between 16:00 and 19:00, the tariff flips: export rates climb to their highest point of the day, rewarding you for sending stored solar back to the grid just as national demand peaks. The remaining hours sit at a middling rate for both import and export, neither as cheap nor as rewarding as the two headline windows.
The structure comes from Octopus Flux’s own tariff page, which confirms both windows and the eligibility criteria behind them: solar panels, a home battery, a smart meter capable of half-hourly readings, and an export MPAN.
A few mechanical points matter once you are living with the tariff day to day, especially if you want to understand how to size your solar and battery system efficiently, as explained in Solar-Powered Bitcoin Mining: Array Size by Miner.
- Import and export rates move with wider wholesale pricing, so the exact pence-per-kWh figure can shift from one review period to the next.
- The 02:00 to 05:00 and 16:00 to 19:00 windows are fixed in local UK clock time, so clocks changing in spring and autumn do not alter when the cheap or peak periods fall.
- Export payments depend on your actual metered export, not an estimate, which is why the export MPAN and smart meter setup matter so much.
Because rates are not identical for every household, two neighbours with similar solar and battery setups can see slightly different numbers depending on when their tariff was reviewed and their region’s wholesale exposure.
Intelligent Octopus Flux versus standard Flux: automation and compatibility
Standard Flux leaves the scheduling to you: you decide when your battery charges and discharges, ideally lining up with the cheap and peak windows yourself. Intelligent Octopus Flux hands that control to Octopus instead, letting the system charge your battery when the grid is cheapest and automatically export during the 16:00 to 19:00 peak, according to Octopus’s Intelligent Flux FAQ.
That automation currently only works with a specific set of batteries:
- GivEnergy
- Enphase
- SolarEdge
- Tesla Powerwall
If your battery is not on that list, standard Flux with manual scheduling is your only route in for now.
Pro Tip: If you already own one of the four compatible battery brands, Intelligent Flux removes the daily guesswork, though you do hand over some direct control in exchange for the convenience.
The trade-off is straightforward: automation can capture peak pricing more consistently than most people manage by hand, but it also means Octopus’s algorithm, not you, decides the exact charge and discharge pattern on any given day.
Eligibility, setup and the steps to switch
Before applying, confirm you meet the basic checklist: solar panels installed, a home battery fitted, a smart meter sending half-hourly readings, an active export MPAN, and both your import and export supplied by Octopus. Many existing solar households are still on “deemed export,” an older arrangement that pays an estimated export figure rather than a metered one, and Flux cannot pay you properly until you move off it, as Octopus’s tariff page sets out.
The practical steps run roughly as follows:
- Check whether your property already has an export MPAN, which your current supplier or a smart meter guide can confirm.
- Verify your battery is either compatible with Intelligent Flux or suitable for manual scheduling on standard Flux.
- Make sure your smart meter is communicating half-hourly data, not just monthly or daily summaries.
- Contact Octopus to request Flux or Intelligent Flux and confirm the switch away from deemed export.
The most common hold-ups are meter communication faults, regional differences in how quickly export MPANs are processed, and households discovering too late that their battery sits outside the compatible list.
Practical benefits, realistic returns, and who should switch
The core appeal is simple: cheap overnight charging, a stronger export rate during the evening peak, and better use of solar you would otherwise waste or sell at a flat rate. Ofgem’s Smart Export Guarantee annual report records that Intelligent Octopus Flux achieved one of the highest peak export rates among SEG tariffs that year, at 27p per kWh for certain bundled arrangements.
Export rates under Flux have reached some of the highest levels recorded across SEG tariffs, according to Ofgem’s SEG report, though the figure applies to a specific bundled tariff in a specific reporting year rather than every Flux customer.
Flux sits within the wider Smart Export Guarantee framework, which requires licensed suppliers to offer at least one export tariff and pay generators based on metered export. Some bundled tariffs also require you to take both import and export from the same supplier.
Who benefits most:
- Battery owners willing to schedule charging manually, or happy to let Intelligent Flux do it.
- Households with enough daily solar generation to fill a battery before the evening peak.
- Solar-only homes without a battery, who often find a flat SEG rate simpler and just as effective.
Returns vary by system size, region and how much electricity you use during the day, so treat any single figure as a guide rather than a guarantee.
How an installer supports a safe switch to Flux
An accredited installer checks more than whether your panels are generating power. Before recommending Flux, we look at export metering wiring, earthing arrangements, and whether an emergency power supply (EPS) back-up is relevant to your setup, alongside confirming your MCS and NICEIC documentation is in order.
Typical installer support includes:
- Assessing battery compatibility with Intelligent Flux before you apply.
- Assisting with the export MPAN application so metered payments start without delay.
- Checking smart meter communication to rule out the half-hourly reading faults that trip up many switches.
- Commissioning and setting initial charge and discharge schedules to match the Flux windows.
Our Octopus Go battery case study shows how proper scheduling stops daytime solar drain, and our fault-finding guide covers the meter and wiring issues that most often delay a Flux application. DIY switching is possible if your system is simple and well documented, but anything involving battery integration or export metering benefits from a professional check first.
Is Flux a good long-term choice for UK homeowners?
Flux rewards attention: the people who do best are those who either schedule deliberately or trust Intelligent Flux to do it for them. Wholesale prices will keep moving the exact figures, and smart tariffs like this are likely to play a growing role in balancing the grid, which could mean better returns over time rather than worse. Before switching, check your battery’s compatibility, run a rough payback estimate against your current tariff, and choose Intelligent Flux if you would rather not think about it daily.
— Simon
Getting your system Flux-ready with Smart Home Technical Ltd
If you are weighing up Flux but unsure whether your panels, battery or meter are ready for it, we offer solar installation, battery integration and export metering support, backed by MCS and NICEIC accreditation.
A site survey settles the compatibility question before you apply, and our Solar & Battery Service & Maintenance Plan keeps your system tuned once you are switched over.
| Service | What it covers | Where to start |
|---|---|---|
| Solar Installations | New panel and battery setup | Solar Installations |
| Solar & Battery Service & Maintenance Plan | Annual checks and optimisation, service priced per year as published by the provider | Service plan |
| EV Chargers | Home and business charger fitting | EV Chargers |
Get in touch for a compatibility check and we will tell you plainly whether Flux, Intelligent Flux, or a simpler export tariff fits your system best.
FAQ
Does the UK export electricity?
Yes, UK households with solar panels and a qualifying setup can export surplus electricity back to the grid, and the Smart Export Guarantee requires licensed suppliers to pay for that exported power. Payments are based on metered export readings rather than estimates.
Do we have octopuses in the UK?
This question is unrelated to the Octopus Flux tariff, which takes its name from the energy supplier Octopus Energy rather than the sea creature. For tariff-related questions, the relevant detail is how the Flux pricing structure works, not marine biology.
Who is the Octopus Flux tariff best for?
Flux suits homeowners with solar panels and a battery who can either schedule charging and discharging themselves or who want Intelligent Octopus Flux to automate it using a compatible battery brand. Solar-only households without a battery often find a flat export rate simpler.
Where can I find my Octopus API key?
Advanced users can generate an API key through the developer settings in their Octopus Energy account, as described in Octopus’s developer documentation. Most homeowners will not need this, since Intelligent Flux and the standard Octopus app handle scheduling automatically.
Sources
- Octopus Flux | Energy tariff designed for solar & batteries | Octopus Energy
- Smart Export Guarantee (SEG) annual report — Year 4 | Ofgem
