Octopus Intelligent Go for EV owners: the real-world guide
Intelligent Go is the most popular EV-specific UK tariff in 2026. Here's how it actually works, what it costs against a standard tariff, the catches nobody mentions, and whether it suits your driving.
Octopus Intelligent Go is the headline EV tariff in the UK. Most new EV buyers end up on it within their first month of ownership, often without comparing alternatives. It works well for most drivers, and a bit oddly for some. This is the real-world version of how it operates.
How it works
Intelligent Go gives you six hours of cheap electricity every night between 23:30 and 05:30, currently 7.5 pence per kWh in 2026. The rest of the day runs at a flat rate (around 27 pence per kWh in 2026, varies by region).
The cheap window is fixed. You charge your EV during it. Your other appliances (washing machine, dishwasher, electric heating) also get the cheap rate if you can schedule them inside that window.
What makes Intelligent Go “intelligent” (rather than just a fixed off-peak tariff): if you tell Octopus the car you have and the charger you have, they can extend the cheap rate to additional hours when the grid is under-loaded. In practice, this often means another 30 to 90 minutes of cheap charging on Sunday nights, Christmas Day, and other low-demand periods.
For most drivers the predictable six-hour window is what actually matters. The bonus hours are a small nice-to-have.
The cost saving against a flat tariff
Take a driver doing 10,000 miles a year in a 3.5 mi/kWh-efficient EV. Annual energy used: 2,857 kWh.
If 90% of charging is done in the cheap window (achievable for any driver with home charging and a typical schedule):
| Tariff | Annual EV charging cost |
|---|---|
| Octopus Intelligent Go (7.5p off-peak + 27p peak) | £292 |
| Octopus standard variable (~27p flat) | £771 |
| Public rapid (~75p flat) | £2,143 |
Saving against a flat tariff: roughly £480 a year. That alone is more than the £199 a Compass EV report costs, before any of the other running-cost wins of switching to an EV.
You can plug your specific tariff and mileage into the EV vs ICE running cost calculator and watch how the saving moves with both.
How to actually get on it
Two routes:
- Already an Octopus customer: switch in the app. Five minutes. Takes effect on your next billing cycle.
- Not an Octopus customer: switch supplier to Octopus first, then move to Intelligent Go after you’ve had at least one billing cycle on their standard tariff. Octopus uses the switching window to install (or remap) your smart meter, which is needed for the half-hourly billing Intelligent Go requires.
The total elapsed time from "I’m not an Octopus customer" to "I’m saving £40 a month on my charging" is typically 6 to 10 weeks. Worth doing before you take delivery of an EV, not after.
What you actually have to do nightly
Nothing, if you set it up properly. The car’s app or the charger’s app schedules the charge to start at 23:30 and finish before the car needs to be ready. Pretty much every charger sold in the UK in 2026 supports this; pretty much every modern EV does too.
The car-side option (schedule in the Tesla/VW Group/Hyundai app) is more reliable than the charger-side option. Charger schedules can occasionally drift on clock-sync issues; the car’s schedule talks to the inverter directly.
For new owners: spend 15 minutes setting up the scheduled charge before your first overnight, and you’ll basically never think about it again.
The catches
Three you should know about before signing up.
1. The peak rate is meaningfully higher than a flat tariff
You're trading lower off-peak rates for higher peak rates. If you can't keep most of your usage in the cheap window — because you work from home with electric heating, say, and your daytime consumption is high — Intelligent Go can cost more over a year than a flat tariff.
Rule of thumb: if you can do 70%+ of your kWh consumption (charging + appliances + heating) inside the 23:30 - 05:30 window, Intelligent Go wins comfortably. Below 50%, a flat tariff is probably cheaper.
For most drivers in homes with gas heating and conventional appliances, the 70% threshold is easy. For all-electric houses with electric heating, it’s harder and worth modelling first.
2. The bonus “intelligent” hours are unpredictable
Octopus markets Intelligent Go heavily on the "smart" charging that finds extra cheap windows. In practice, the bonus hours are real but inconsistent. You'll get them on quiet days; you won't on cold winter evenings when grid demand is high. Don't plan your charging around them; treat them as occasional surprise upside.
3. Charger-and-car compatibility is narrower than the marketing implies
Octopus needs to talk to your charger or your car to use the "intelligent" features. The supported list has expanded a lot in 2026 but still doesn't cover everything. Standard suspects (Tesla, Skoda/VW Group, Hyundai/Kia, BMW, Polestar, Renault new models) work fine. Older or off-brand vehicles + chargers can be limited to the basic 6-hour window without the smart-extension capability — which is still the main saving anyway.
Check Octopus’s supported-devices list before assuming the smart features work for your specific combination.
Alternatives worth knowing
Three other EV-friendly UK tariffs in 2026:
| Tariff | Cheap window | Off-peak rate | Notes |
|---|---|---|---|
| Octopus Intelligent Go | 23:30 - 05:30 | 7.5p | Headline EV tariff |
| Octopus Agile | Half-hourly, variable | 0 - 15p typical | Saves more for drivers who can shift load actively; more complexity |
| OVO Charge Anytime | Whenever the car charges | 7p | Cheap rate applies whenever your EV charges, not just nights — but requires OVO charger and supported car |
| E.ON Drive at Home | 00:00 - 04:00 | 8p | Smaller window, no smart features |
Intelligent Go is the most popular because the trade-offs are predictable and the supported-device list is the broadest. It's not always the cheapest. OVO Charge Anytime is often cheaper if your car and charger are on the list and you're willing to be locked into OVO’s ecosystem.
What this means for the buyer report
Section 6 of every Compass EV report uses your actual current tariff when modelling the running cost difference between your existing car and the recommended EV. If you’re not yet on an EV tariff, we model both scenarios:
- Running cost on your current tariff (the floor)
- Running cost after moving to Intelligent Go or equivalent (the realistic post-purchase scenario)
The difference between the two is often £400 to £600 a year. Worth knowing before you sign for the car, not after.
Related
- EV vs petrol/diesel running cost calculator — plug in 7.5p home tariff to see your specific saving.
- Why annual mileage matters less than you think — the tariff structure matters as much as total miles.
- The four reasons an EV is the wrong call — “no off-street parking” is the situation where Intelligent Go can’t help.