Octopus Energy + Solar Panels: The Best EV Charging Setup in the UK?
Octopus Energy's Flux, Intelligent Octopus, and Go tariffs can transform what solar panels earn and what overnight EV charging costs. Here's how to combine them correctly.
Why Octopus Changes the Solar + EV Equation
Most electricity tariffs treat solar surplus as something to discard cheaply and overnight charging as something that costs the same regardless of timing. Octopus Energy has built several tariffs that break both assumptions — and for EV owners with solar panels, combining them correctly can cut annual charging costs to near zero.
This guide covers Octopus Flux, Intelligent Octopus, and Octopus Go — and explains which combination makes most sense for different setups.
Octopus Go: The Baseline EV Tariff
Octopus Go offers a fixed low rate of £0.075/kWh overnight (00:30–05:30), with a standard rate of ~£0.24/kWh at all other times. It requires a smart meter.
For EV owners without solar, Octopus Go is the single biggest lever available to reduce charging cost — shifting overnight charging from the standard rate saves around £400–600/year at typical mileages.
For solar owners: Go is a good complement if your solar generates more than you can self-consume and you want cheap top-ups in winter. The limitation is that the cheap window is in the middle of the night — when your solar isn't producing. The tariff doesn't adapt to solar output.
Intelligent Octopus: Smart Scheduling Without Manual Input
Intelligent Octopus connects directly to your EV (Tesla, BMW, Volkswagen Group, and others) via the car's API. You set a departure time and charge target; Octopus schedules charging to happen in the cheapest overnight windows automatically.
The key benefit over basic Octopus Go: sessions can start and stop dynamically within the cheap window, and Octopus will sometimes shift charging earlier or later based on grid conditions. Rates are similar to Go — around £0.075–0.085/kWh during smart sessions.
For solar owners: Intelligent Octopus is a good overnight companion to daytime solar. Your EV charges from solar during the day when possible, and Intelligent Octopus fills the rest cheaply at night without you scheduling anything.
Compatible vehicles include Tesla Model 3 and Y, Volkswagen ID.3, ID.4, and ID.5, BMW iX, i4, and i5, and several others. The list expands regularly — check the Octopus website for current compatibility.
Octopus Flux: The Solar Arbitrage Tariff
Octopus Flux is specifically designed for homes with solar panels and a battery. It has three time-of-use pricing periods:
- Flux Off-Peak (02:00–05:00): cheap rate for battery charging from the grid (~£0.13/kWh)
- Standard (05:00–16:00 and 19:00–02:00): mid rate (~£0.24/kWh)
- Flux Peak (16:00–19:00): expensive grid rate (~£0.35/kWh), but you're also paid £0.35/kWh for any electricity you export in this window
The model: charge your battery cheaply at night, use solar during the day, and export any remaining battery charge during the evening peak window when Octopus pays maximum rates.
For EV owners with solar and a battery: Flux can be highly lucrative if you have enough battery capacity to arbitrage the off-peak/peak spread. An EcoFlow DELTA Pro Ultra or similar home battery system can be charged at £0.13 and its energy sold at £0.35 — a spread of £0.22/kWh.
Without a battery: Flux is less compelling. You'd be on a higher import rate than Go for most of the day, and the export premium only applies for three hours in the evening.
Octopus Outgoing: Maximising SEG Revenue
For solar owners who don't want to use Flux, Octopus Outgoing offers the UK's most competitive Smart Export Guarantee rates — typically 15p/kWh for exported surplus, compared to 4–5p from most suppliers.
Combined with Octopus Go for overnight EV charging, Outgoing + Go is often the best pairing for solar owners without a home battery:
- Import: £0.075/kWh overnight for EV charging
- Export: up to £0.15/kWh for unused solar surplus
- Net effect: solar powers your home and EV by day; cheap overnight rate covers winter shortfalls
Which Combination Is Right for You?
| Setup | Best Octopus tariff |
|---|---|
| EV only, no solar | Intelligent Octopus |
| Solar only, no battery, no EV | Outgoing (for SEG) |
| Solar + EV, no battery | Intelligent Octopus + Outgoing |
| Solar + EV + battery | Octopus Flux |
| Solar + EV, want simplicity | Octopus Go + Outgoing |
The Numbers: Solar + Intelligent Octopus in Manchester
EV: Volkswagen ID.4 Pro (21 kWh/100 km)
Annual mileage: 12,000 miles (19,300 km)
Solar: 8 × 400W panels (south-facing, Manchester)
Grid tariff: Intelligent Octopus (£0.085/kWh overnight, £0.24/kWh otherwise)
| Without solar | With solar + Intelligent Octopus | |
|---|---|---|
| Annual EV consumption | 4,060 kWh | 4,060 kWh |
| Solar covers (daytime charging) | — | ~1,800 kWh |
| Grid top-up needed | 4,060 kWh | ~2,260 kWh |
| Grid cost (overnight rate) | £345/year | £192/year |
| Solar savings | — | £432/year |
| Total annual charging cost | £345 | ~zero (savings exceed cost) |
When solar savings exceed grid charging cost, you've effectively reached zero-cost EV driving — and the panels are still generating household savings on top.
Is Octopus the Only Option?
No — Eon Next, EDF, and British Gas all offer smart EV tariffs. But Octopus consistently offers the widest range of solar-compatible tariffs and the most competitive SEG rates. It's also the UK's largest electricity supplier by customer count, with the most mature smart tariff infrastructure.
Use the VoltSun Charge Planner to see today's optimal charging window for your location — whether you're on Octopus or another tariff, knowing when solar production peaks and electricity prices dip is the same calculation.
Want a new EV with up to 40% off? Octopus EV Salary Sacrifice → lets UK employees save on Income Tax and National Insurance when leasing an EV through their employer — free to set up for the company.