Intelligent Octopus Go 12M Fixed - EV Saver: Is it for You?
Right, let's get stuck into a specific Octopus Energy tariff, pulled directly from their API. We're talking about the "Intelligent Octopus Go 12M Fixed - EV Saver". Octopus themselves describe it as offering "access to a super low electricity rate between 23:30 - 05:30 every night, plus it smart-charges your car at the cheapest and greenest times overnight." Sounds great on paper, doesn't it? But, as a developer who loves digging into the numbers and helping people save cash, I want to break down whether this fixed-term tariff genuinely stacks up for you, especially given the current energy market in July 2026.
The Developer's View: What the API Tells Me
As someone who regularly pokes around the Octopus Energy API - for fun, and to keep an eye on rates for my neighbours in Tonbridge - I can tell you these figures are live. I've pulled these exact rates directly from their API endpoints, ensuring we're looking at the most up-to-date information for this specific tariff. For the Intelligent Octopus Go 12M Fixed - EV Saver, you're looking at:
- Electricity Unit Rate (Daytime): 32.6401p/kWh (inc VAT)
- Electricity Unit Rate (Overnight 23:30 - 05:30): Typically around 7.5p/kWh (inc VAT) - this is the "super low" bit for your EV.
- Electricity Standing Charge: 44.1226p/day (inc VAT)
It's that fixed element, "12M Fixed", that's particularly interesting right now.
Why Fixed Matters Now: July 2026 Price Cap Context
You'll have heard Martin Lewis and MoneySavingExpert hammering this home: the Ofgem price cap just soared on 1 July 2026. Driven by those ugly Middle East conflicts and Iran-US tensions pushing wholesale gas prices through the roof, the cap rose a whopping 13.5% overall. For electricity, that means the unit rate for a typical household on a variable tariff is now around 27.8p/kWh, and the standing charge is roughly 60.16p/day. Gas unit rates shot up an eye-watering 27.7%. For many, that's an extra ~£221 a year for a typical household.
Martin Lewis has been crystal clear: for most people, this rise is "voluntary" if you can fix your rates. So, how does Intelligent Octopus Go 12M Fixed - EV Saver stack up against the new cap?
- Fixed Day Rate (32.6401p/kWh) vs. New Price Cap (~27.8p/kWh): Crucially, your daytime electricity on this fixed tariff is actually higher than the new price cap. This is a big point to consider.
- Fixed Standing Charge (44.1226p/day) vs. New Price Cap (~60.16p/day): Here's a win! The fixed standing charge is significantly lower than the new price cap.
This tariff isn't about saving money on your everyday daytime usage; it's about the overnight EV charging and the security of a fixed standing charge.
Who is Intelligent Octopus Go EV Saver *Really* For?
Let's be honest. Not every tariff suits everyone. This one has a specific audience.
Pros:
- Fixed Rates for 12 Months: You're shielded from further price cap increases for a year, offering peace of mind in volatile times.
- Super Low Overnight EV Charging: That ~7.5p/kWh rate for over six hours every night is fantastic if you're charging an EV regularly. This is where the real savings are.
- Smart Charging Optimisation: Octopus takes the hassle out of finding the cheapest and greenest times to charge your car.
- Lower Standing Charge: At 44.1226p/day, it's a good chunk cheaper than the new price cap's standing charge.
- £50 Referral Credit: If you're switching to Octopus, you can get £50 credit on your bill using a referral link like mine: https://share.octopus.energy/wise-peach-776. Every little helps!
Cons:
- Higher Daytime Unit Rate: This is the big one. Your standard daytime electricity usage will cost you more per kWh than if you were on the new price cap variable tariff. If you use a lot of power during the day and not much overnight, this tariff could actually cost you more overall.
- Requires a Smart Meter: Essential for the smart charging and specific off-peak rates.
- Requires an Eligible EV or EV Charger: Not just any car or charger will do; Octopus needs to be able to communicate with it.
- Lack of Flexibility: You're locked in for 12 months. If wholesale prices suddenly plummet, you won't benefit until your fixed term ends.
My Honest Verdict: Crunching the Numbers
If you drive an electric vehicle, have a smart meter, and do a significant amount of your charging overnight, then the Intelligent Octopus Go 12M Fixed - EV Saver could be a fantastic deal. The savings from that ultra-low overnight rate could easily outweigh the higher daytime unit rate, especially with the lower standing charge. You need to do your own sums, looking at your actual daytime vs. overnight electricity usage.
However, if your EV usage is minimal, or you consume most of your electricity during the day, this tariff is likely not for you. You'd be better off looking for a different fixed deal or sticking with the price cap variable if you're not a heavy EV user.
Don't Just Take My Word for It: Check the Whole Market
While I've given you my developer's honest take on this specific tariff, it's always wise to compare. Head over to MoneySavingExpert's Cheap Energy Club for a full, unbiased comparison across the entire market. Your personal usage patterns are unique, and what works for one household in Tonbridge might not work for another. Do your homework, crunch your numbers, and make an informed decision.