Octopus Go gives you a nightly off-peak window from 00:30 to 05:30, while Intelligent Octopus Go stretches that guaranteed home window to 23:30 to 05:30 and adds up to six hours of smart EV charging on top. Both windows run every night of the year, including bank holidays, with no exceptions for weekends.
TL;DR:
- The standard Go discount covers every household load during its off peak window, but regional rates vary and electricity outside it costs the normal rate.
- Intelligent Octopus Go can schedule six additional EV charging hours outside its guaranteed window, but those discounted slots cover the car, not household use.
- Neither tariff can start until a smart meter sends readings every half hour; after Octopus confirms transmission, accept the activation terms before discounted rates begin.
- Estimate savings by multiplying shifted kilowatt-hours by the gap between your standard and Go rates, then by the nights you charge; regional rates differ.
- In two EV households, the app schedules one vehicle per account, so put the second car on a timer and stagger charging to avoid overload.
Table of Contents
- What are Octopus Go hours: exact times, billing scope and DST behaviour
- How Intelligent Octopus Go differs from standard Go
- How to use the off-peak hours to save money
- How to switch to Octopus Go or Intelligent Octopus Go
- Typical savings and regional price-cap context
- Installer perspective: pairing chargers, batteries and Octopus Go
- Installer’s checklist: common issues and questions to ask
- How our services help with Octopus Go savings
- FAQ
- Sources
What are Octopus Go hours: exact times, billing scope and DST behaviour
The standard Octopus Go tariff runs a fixed five-hour cheap window from 00:30 to 05:30 every night. Electricity used during that window is billed at the discounted Go rate, and it covers the whole home, not just a car charger. Run a washing machine, heat a hot water cylinder or charge an EV in those hours and all of it gets the off-peak price.
A few practical points worth knowing before you plan around the window:
- The 00:30 to 05:30 window applies every single night, weekends and bank holidays included, with no seasonal suspension.
- Clocks changing for British Summer Time or back to GMT do not shift the window: it always runs by the clock on your wall, not solar time.
- Rates can vary slightly by region and supply area, so it is worth checking your own figures on the Octopus Go rates page rather than assuming a national flat rate.
- The discount applies strictly within those five hours; anything drawn just before or after reverts to your normal unit rate.
How Intelligent Octopus Go differs from standard Go
Intelligent Octopus Go guarantees a longer home window, typically 23:30 to 05:30, six hours rather than five, plus a separate benefit: up to six hours of smart EV charging within any 24-hour period, scheduled automatically around your plug-in time and when you need the car ready.
That smart charging allowance does not have to sit inside the guaranteed home window. Octopus’s system picks slots based on grid conditions and your car’s needs, which means:
- Smart-scheduled charging sessions can run outside 23:30 to 05:30 and still get the cheap rate, specifically for the vehicle.
- Whole-home usage outside the guaranteed window reverts to your standard rate, even while the car charges cheaply in a scheduled slot.
- The app typically recognises one vehicle per account for scheduling purposes, so households often report needing manual timers for a second car.
- Scheduling tends to favour lower-carbon grid periods, so charging times can shift slightly night to night rather than following a fixed clock pattern.
How to use the off-peak hours to save money
Capturing the Octopus Go discount is about making sure your biggest loads, especially EV charging, actually fall inside the cheap window rather than spilling into normal-rate hours either side of it.
- Set your EV charger’s built-in timer to start at 00:30 (or 23:30 if you’re on Intelligent Octopus Go) and stop by 05:30, rather than relying on the car’s own scheduling, which can drift.
- Use the Octopus app’s “ready by” feature on Intelligent Octopus Go so the system calculates the charge needed and schedules it automatically within the smart allowance.
- Work out your typical daily mileage and only request the charge you need: topping up from 40% to 80% most nights avoids slow “bump” charging that spills past the window.
- Shift washing machine, dishwasher and tumble dryer cycles to start after 00:30, using delay-start settings most modern appliances already have.
- Top up a home battery during the window too, so stored charge covers early morning and evening peak-rate periods.
- In a two-EV household, put one car on the app’s smart schedule and the second on a simple plug-in timer, staggering start times to avoid tripping a circuit.
Pro Tip: Check that your charger, smart meter and car can all communicate properly before relying on automatic scheduling; a firmware mismatch is the most common reason a scheduled charge quietly runs at the wrong time, so ensure your vehicle supports compatible tracking technology as detailed in the hybrid car tracker compatibility guide.
How to switch to Octopus Go or Intelligent Octopus Go
Switching hinges on your smart meter working properly, not just being present. Octopus needs the meter sending half-hourly consumption data before either tariff can go live, and there’s a confirmation step you shouldn’t skip.
- Confirm you have a smart meter installed and that it is actively transmitting half-hourly readings, not just installed but dormant.
- Once Octopus confirms the data flow, you’ll typically get an activation email to accept the tariff’s terms before the new rates apply.
- Allow a reasonable window for the switch to complete, and chase Octopus directly if you haven’t heard anything after your meter is confirmed live.
- Before switching, have your MPAN number, recent meter readings and EV or battery details to hand so support can troubleshoot quickly if anything stalls.
Typical savings and regional price-cap context
How much you actually save depends heavily on where you sit against Ofgem’s regional price cap, which sets different unit rates and standing charges by region rather than one UK-wide figure.
Ofgem’s price cap varies by region, which means the same Octopus Go discount is worth more in some parts of the country than others, since it’s measured against a different baseline unit rate each time.
- Standing charges matter more in smaller, efficient homes, where fixed daily costs can outweigh what you save on units at night.
- For EV-owning households with higher overall electricity use, the unit-rate saving from shifting consumption into the Go window tends to matter more than the standing charge.
- A rough way to estimate your own saving: multiply the kWh you’d normally charge in daytime hours by the gap between your standard unit rate and the Go rate, then multiply by the nights you actually charge.
- Your real saving depends on your whole household’s usage pattern, not just the car, since appliances shifted into the window add to the total.
Installer perspective: pairing chargers, batteries and Octopus Go
Getting the tariff right on paper is one thing; making the hardware behave is another. In our installation work, the checks that actually determine whether off-peak charging pays off usually come down to data and configuration, not the tariff itself.
- Reviewing twelve months of meter data before sizing a battery avoids paying for storage capacity a household will rarely use, a point we cover in more detail in our guide on when an installer’s check makes off-peak battery charging pay.
- Pairing an EV charger with a home battery tends to help most in homes with solar, where the battery can soak up daytime generation and still top up cheaply overnight, something we walk through in our Octopus Go battery setup guide.
- Charger firmware and app connectivity need checking at install, since a charger that can’t confirm its schedule to the app is the most common cause of a missed off-peak window.
- Load balancing matters in multi-EV households, covered in our piece on charger solar panel pairing in Hampshire, to stop two cars charging simultaneously from overloading a single circuit.
Pro Tip: Ask any installer whether they size batteries from your actual meter data or from a generic household average; the difference often decides whether the system pays for itself.
Installer’s checklist: common issues and questions to ask
Most problems we see come down to three things: a smart meter that isn’t actually sending data, a household expecting unlimited cheap charging rather than a fixed window, and app scheduling nobody checked after install. Before hiring anyone, ask what they do with your meter data, how they size a battery for your actual usage, and what guarantee covers the work.
— Simon
How our services help with Octopus Go savings
We install and configure EV chargers, home batteries and solar systems to support efficient use of off-peak electricity tariffs. This includes charger scheduling, battery sizing based on meter data, and ongoing support if needed after installation.
- Our EV Chargers service includes installation and configuration to facilitate proper charger operation.
- Our Solar Installations service includes installing solar panels and battery systems.
- Our Solar & Battery Service & Maintenance Plan at £175 per year keeps the system checked and performing as conditions and tariffs change.
If you want a setup that uses the cheap hours, request a quote through our EV Chargers page and we’ll start with a proper look at your meter data.
FAQ
Does Octopus Energy do off-peak times?
Yes. Octopus Go offers a nightly off-peak window from 00:30 to 05:30, and Intelligent Octopus Go extends that guaranteed window to 23:30 to 05:30 with extra smart EV charging hours on top.
What is the 80/20 rule for charging electric cars?
It’s a battery-care guideline rather than an Octopus Go rule, but it fits naturally with scheduling a top-up charge inside the cheap window each night.
Can I live chat with Octopus Energy customer service?
Octopus Energy offers digital support channels through its app and website for account and tariff queries, including activation questions tied to smart-tariff switching. Specific availability and contact routes are best confirmed directly on Octopus’s own support pages.
Is the Octopus Go off-peak rate for the whole house or just the car?
The standard Octopus Go rate applies to the entire home during the 00:30 to 05:30 window, not just an EV charger. Anything drawing power in that window, from appliances to a battery top-up, gets the discounted rate.
