Octopus Flux is a time-of-use import and export tariff designed for households with solar panels and a home battery. If you also drive an electric vehicle, the tariff lets you charge your car during the cheapest overnight window and export surplus energy during peak-price periods — squeezing maximum value from every unit your panels generate. This guide explains how Flux works for EV owners specifically.
Key Takeaways
- Octopus Flux requires solar panels, a home battery, and a smart meter to join.
- Charging your EV during the 02:00–05:00 off-peak window gives you the cheapest import rate.
- During the 16:00–19:00 peak window, you can discharge your battery and export to the grid at a higher rate.
- An average solar household with a 4.9kWp system and 5.2kWh battery saves approximately £937 per year on Flux.
- Flux was temporarily unavailable in early 2026 due to energy price volatility — check the current status with Octopus Energy before applying.
- Rates vary by region. Verify current rates with Octopus Energy at the point of application.
What is Octopus Flux?
Octopus Flux is an import/export tariff available to Octopus Energy customers who have both solar panels and a home battery. Unlike a standard flat-rate tariff, Flux charges different amounts for electricity depending on the time of day — and also pays you different rates for what you export, based on the same time windows.
The three daily periods are:
| Window | Time | Purpose |
|---|---|---|
| Off-peak | 02:00–05:00 | Cheapest import — charge battery and EV |
| Shoulder | All other hours | Standard import/export rates |
| Peak | 16:00–19:00 | Highest export rate — discharge battery |
The goal is to import cheap overnight electricity, store it in your battery (and use it to charge your car), then export surplus solar or stored energy during peak pricing hours when the grid pays a premium.
What you need to join Octopus Flux
Eligibility requirements include:
- Solar panels — you do not need to have had them installed by Octopus; any MCS-certified system qualifies
- Home battery storage — compatible models include GivEnergy, Tesla Powerwall, FoxESS, and Sigenergy
- Smart meter — SMETS2 or a compatible SMETS1 Secure™ meter
- Export MPAN — you must be able to export to the grid
- MCS document or FlexiOrb certificate for your solar installation
- Confirmation from your local energy network of the installation
An electric vehicle is not a requirement to join, but EV owners are among the biggest beneficiaries of the tariff structure.
How EV charging works on Octopus Flux
On Flux, your EV should charge during the 02:00–05:00 off-peak window. Most EVs can be programmed to charge on a schedule directly from the vehicle’s app or infotainment system. If your EV charger supports scheduled charging (all new chargers installed in Great Britain must be smart by law), you can set it to charge automatically during this window.
A standard 7kW home charger running for three hours during the off-peak window delivers approximately 21kWh — enough for around 65–75 miles of range in a typical family EV. That covers average daily driving needs several times over, so most EV owners on Flux will top up fully each night.
Using Intelligent Octopus Flux for automated control
Octopus also offers Intelligent Octopus Flux, which automates battery charging and discharging based on the same time windows. Compatible batteries are controlled via the Octopus app, so you do not need to manually schedule imports or exports. For EV owners with compatible chargers, intelligent scheduling can extend the automation to your car as well.
Can you charge from your solar panels directly?
Yes, during daylight hours your panels can generate surplus electricity that is not needed by your home. This surplus can:
- Charge your home battery automatically
- Charge your EV directly via a solar-compatible charger such as the myenergi Zappi, which diverts surplus generation to the car before any excess is exported
- Be exported to the grid — earning the Flux peak-rate export payment if you export during 16:00–19:00
Having a solar-diverting charger and a battery means you can capture more of your generation before exporting, and then still sell anything remaining during the peak window.
Estimated savings for EV owners
Savings on Octopus Flux depend heavily on your solar generation, battery size, and driving habits. Octopus’s own modelling for an average solar household (4.9kWp system, 5.2kWh battery) estimates annual savings of approximately £937 compared to a standard flat-rate tariff — from a combination of reduced import costs and premium export revenue.
EV owners typically save more because they consume more electricity overnight (shifting high usage to the off-peak window multiplies the benefit) and their battery can bridge daytime solar and evening consumption without importing at shoulder rates.
Exact savings are highly location and usage dependent. Rates vary by region and are subject to change. Always request a personalised estimate from Octopus before switching.
Is Octopus Flux currently available?
Octopus Flux was listed as temporarily unavailable on the Octopus Energy website in early 2026, due to energy price volatility making the tariff economics difficult to sustain. Octopus periodically pauses and re-opens applications. Check the Octopus Energy Flux page directly for current availability.
If Flux is not available when you check, Octopus Agile and Octopus Intelligent are alternative time-of-use tariffs that EV owners can benefit from. You can compare all active Octopus EV tariffs on the EV tariffs page at BestChargers.
Frequently Asked Questions
Do I need an electric vehicle to join Octopus Flux? No. Octopus Flux is designed primarily for solar and battery owners, not specifically for EV drivers. You can join if you meet the solar, battery, and smart meter requirements regardless of whether you own an EV. EV owners benefit most from the overnight off-peak charging window, but the tariff works without one.
Which home batteries are compatible with Octopus Flux? Compatible batteries for Intelligent Octopus Flux include GivEnergy, Tesla Powerwall, FoxESS, and Sigenergy. The list may change as Octopus adds new integrations. Check the current compatibility list on the Octopus Energy website before purchasing a battery with the intention of joining Flux.
What if I export more than I generate with solar? You can export battery-stored electricity during the 16:00–19:00 peak window, even if you imported that electricity overnight at the cheap off-peak rate. This buy-low-sell-high approach is a deliberate feature of the Flux tariff structure and one of the main reasons battery owners adopt it.
What is the difference between Octopus Flux and Intelligent Octopus Flux? Standard Octopus Flux requires you to manually schedule your battery charging and discharging to align with the time windows. Intelligent Octopus Flux connects directly to compatible batteries via the Octopus app and automates the scheduling. If your battery is compatible, the Intelligent version is generally more convenient.
Useful Resources
- Octopus Flux tariff page — Octopus Energy
- Smart Export Guarantee rates — Ofgem
- EV charging with solar panels guide