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Every EV charger sold in Scotland under the OZEV grant scheme is legally required to be smart. That single regulatory fact, combined with the availability of dedicated EV electricity tariffs at 7p to 9p per kWh, has created a situation where Aberdeen and Aberdeenshire homeowners with the right setup can charge their cars for roughly 2p per mile overnight. This guide explains exactly what a smart EV charger does, which off peak tariffs in Scotland deliver the most savings in 2026, how the leading chargers integrate with those tariffs, and what the practical reality looks like for a household that simply wants to stop thinking about when to charge.
What makes an EV charger smart?
A smart EV charger is one that can communicate beyond the simple act of passing electricity to the car. In practical terms, a smart charger has at least the following capabilities:
- WiFi or cellular connectivity, allowing the charger to communicate with an app, an energy management platform, or a back office system over the internet.
- Remote monitoring and control, so the owner (and potentially the energy supplier) can see current state, start or stop charging, and review historical session data.
- Scheduled charging, meaning charging can be set to begin and end at specific times, typically to coincide with off peak tariff windows.
- Random start delay, a requirement under Schedule 1 of the Electric Vehicle (Smart Charge Points) Regulations 2021, which prevents all EVs in a neighbourhood from starting to charge simultaneously at the same time and overloading the local grid.
The OZEV grant scheme requires all grant eligible chargers to meet these smart requirements. Every charger Faithful Spark installs under the OZEV scheme is compliant. Non smart chargers (simple plug in units without connectivity or scheduling) are not OZEV eligible and cannot claim the grant funding.
Above this baseline, the more advanced smart chargers add further capabilities: direct tariff API integration (where the charger knows your electricity rate in real time), solar diversion (where surplus solar generation is directed into the EV rather than exported), load balancing with other household circuits, and compatibility with Vehicle to Grid (V2G) protocols in development for future two way energy flows.
The off peak tariff landscape in Scotland in 2026
The financial case for smart charging depends entirely on pairing the right charger with the right tariff. In Scotland in 2026, there are four main EV focused tariffs available to homeowners:
Octopus Go
Octopus Go is one of the most widely used EV tariffs in the UK. It offers a fixed off peak rate of 7p per kWh between midnight and 05:00 every night, with a standard unit rate (currently around 24p to 28p per kWh depending on standing charge option) for all other hours. For a household that charges predominantly overnight, Octopus Go delivers a consistent overnight rate with no app or car integration required. You set the car to charge at midnight, and Octopus charges you 7p per kWh until 05:00.
The practical implication: charging a typical 60 kWh EV from 20 percent to 80 percent (36 kWh) overnight on Octopus Go costs £2.52 at 7p per kWh. The same charge on a standard 26p tariff costs £9.36. For a household covering 10,000 miles per year, that tariff difference saves approximately £550 to £700 annually.
Intelligent Octopus
Intelligent Octopus goes further than Go. Rather than a fixed overnight window, Intelligent Octopus integrates directly with compatible EVs and chargers to identify the cheapest charging periods across a longer window (typically 23:00 to 09:30) and schedules charging automatically to hit those slots. The rate during the smart window is 7p to 9p per kWh depending on grid conditions. The household sets a departure time and a target charge level (say, 06:45 and 80 percent), and the system handles everything else.
Car compatibility is the main variable: Intelligent Octopus works natively with Tesla, Volkswagen Group vehicles (VW, Audi, Skoda), BMW, Kia, Hyundai, and most major EV brands. Charger compatibility is required for the charger side integration: the Ohme Home Pro is the most tightly integrated home charger with Intelligent Octopus, communicating directly with the tariff API to receive dispatch instructions in real time.
EDF GoElectric
EDF’s GoElectric tariff offers a fixed cheap rate (currently around 8.5p per kWh) between midnight and 07:00, with a standard rate for all other consumption. It is simpler in structure than Intelligent Octopus (no smart dispatch, just a fixed window) but delivers similar savings for EV overnight charging. EDF’s integration with the Ohme charger allows the Ohme to automatically align charging sessions with the GoElectric cheap window without manual scheduling on each session.
OVO Charge Anytime
OVO Charge Anytime offers a flat rate of around 7p per kWh for EV charging only, at any time of day or night. It achieves this through smart charger or car integration: the energy is metered separately from household use, and OVO bills the EV charging at the preferential rate. It requires a compatible charger or car API for the metering separation. For EV owners who also want to charge during the day (for example, topped up during a lunch break at home), Charge Anytime removes the time window discipline that Octopus Go requires.
How the leading chargers integrate with off peak tariffs
The three chargers Faithful Spark most commonly installs in Aberdeen and Aberdeenshire each approach tariff integration differently.
Ohme Home Pro
The Ohme Home Pro is the most deeply tariff integrated home charger on the UK market. It connects directly to Octopus Energy, EDF, OVO, and several other suppliers via their APIs, and automatically schedules charging to align with the cheapest available periods. Setup is a one time configuration in the Ohme app: you enter your tariff details, connect to your energy account, and set a default departure time and charge level. From that point on, the charger manages scheduling automatically. There is nothing to set each night. You plug in, and the Ohme handles the rest.
For Aberdeen homeowners on Intelligent Octopus, the Ohme Home Pro is the recommended pairing because the two communicate in real time: Octopus sends dispatch signals to the Ohme, which starts and stops charging in response to grid conditions and pricing. The result is the lowest possible cost per kWh without any owner involvement.
Zappi v2 by myenergi
The Zappi’s primary differentiator is solar diversion. In Eco and Eco+ modes, the Zappi monitors the home’s CT clamp (a current transformer clipped to the main incoming cable) and automatically diverts surplus solar generation into the car before it is exported to the grid. This is the most efficient use of domestic solar in Scotland: the exported unit rate (currently 8p to 15p per kWh under Smart Export Guarantee contracts) is always lower than the import rate the household pays. Using that unit in the car instead of exporting it is worth the full import rate differential.
The Zappi does also support manual scheduled charging (via the myenergi app), but it does not have the deep tariff API integration of the Ohme. For households without solar, the Ohme is typically the better choice. For solar households, the Zappi’s diversion capability makes it the standout option. For a full comparison, see our guide on the myenergi Zappi for solar panel owners.
Easee One
The Easee supports scheduled charging via its app and is OCPP compatible, which allows third party energy management platforms (including some Octopus integrations) to control it via the open protocol. It does not have the dedicated tariff API integration of the Ohme, but for households who are comfortable setting a manual charge schedule in the app each week, the Easee delivers essentially the same overnight off peak saving at a lower purchase price. For a full three way comparison, see our Zappi vs Ohme vs Easee breakdown.
The cost comparison: smart vs standard tariff charging
The numbers are striking enough to set out plainly:
- Standard unit rate (Scotland, 2026): approximately 24p to 28p per kWh
- Octopus Go off peak rate: 7p per kWh (midnight to 05:00)
- Cost per mile, standard rate: approximately 7p to 8p per mile for a typical 4 mile per kWh EV
- Cost per mile, Octopus Go overnight: approximately 1.8p to 2.1p per mile
- Annual saving (10,000 miles): £500 to £700 per year switching from standard rate to off peak EV tariff
- Petrol equivalent (10,000 miles at £1.50 per litre, 40 mpg): approximately £1,700 per year
The arithmetic is why home EV charging on an off peak tariff is described as transformative by the homeowners who experience it. The first monthly electricity bill after switching to Octopus Go typically shows a lower total than the previous month despite adding an EV to the household, because the cheaper overnight rate displaces some daytime household usage through smart scheduling of appliances alongside the car.
Scotland, renewables, and overnight charging
Scotland has a specific grid context that makes overnight EV charging particularly attractive from an environmental perspective as well as a financial one. Scottish wind generation is among the highest and most consistent in Europe. On a typical night in Aberdeen or Aberdeenshire, a significant proportion of the electricity flowing through the grid is from onshore and offshore wind farms located within 100 miles of the property.
Overnight charging periods (midnight to 06:00) coincide with lower overall grid demand, which means the carbon intensity of grid electricity in Scotland at those hours is typically lower than during the day when industrial and commercial demand is high. For households who care about the carbon footprint of their driving as well as the cost, smart overnight charging on a Scottish supply maximises both benefits simultaneously.
The future direction is V2G: Vehicle to Grid technology, already in limited deployment in parts of the UK, allows a bidirectional charger to discharge energy from the car battery back into the home or grid during peak demand periods, effectively making the EV a household battery asset. Smart charger infrastructure is the prerequisite for V2G participation. Every OCPP smart charger installed today is part of the foundation for that future use.
Setting up smart charging: what it looks like in practice
For an Aberdeen homeowner installing an Ohme Home Pro on Intelligent Octopus, the practical setup is straightforward:
- Faithful Spark installs the Ohme, commissions the WiFi connection, and sets up the app on your phone at the install visit.
- You connect the Ohme app to your Octopus account using your Octopus API key (available in the Octopus online account, takes 2 minutes).
- You set your default departure time and target charge level in the Ohme app (for example, 07:30 and 80 percent).
- You plug the car in when you get home each evening. The Ohme handles all scheduling from that point. You do not interact with the app again unless your routine changes.
Total ongoing management time per week: approximately zero minutes. The system runs autonomously. You see the nightly sessions in the app history if you want to review them, and the Octopus app confirms the off peak kWh used at each session. If you go on holiday, the charger simply does nothing until you plug in again. If your departure time changes, you update it in the app once.
Frequently asked questions
Do I have to switch energy supplier to get an EV tariff?
Yes, dedicated EV off peak tariffs like Octopus Go and Intelligent Octopus are Octopus Energy products, and EDF GoElectric is an EDF product. To access these rates you need to be a customer of the relevant supplier. Switching is straightforward through the energy comparison and switching services, takes around 4 to 6 weeks, and the standing charge and general household unit rate on these tariffs is often broadly comparable to a standard deal. The EV off peak rate is additional to, not instead of, a standard tariff structure.
Will my household electricity bill go up when I get an EV?
Your total electricity consumption will increase, but the cost per unit for EV charging is so much lower than the standard household rate that many Aberdeen households see their combined electricity and fuel costs fall significantly after adding an EV and switching to an off peak tariff. A typical household adding an EV and switching to Octopus Go sees their electricity bill rise by £15 to £25 per month while their fuel costs fall by £100 to £130 per month. Net monthly saving: £75 to £110.
Can I use any smart charger with Intelligent Octopus?
Intelligent Octopus integrates with specific compatible chargers (Ohme, Indra, and a small number of others) and directly with the car API for some vehicle brands. The Ohme Home Pro is the most consistently recommended charger for Intelligent Octopus integration because the communication is direct, reliable, and maintained by Ohme as a primary product feature. The Easee and Zappi both work with Octopus Go (manual schedule or basic API), but their Intelligent Octopus integration is less seamless.
What happens if I forget to plug in?
Nothing bad happens. The car simply does not charge that night. If you need a full charge by morning and realised late, most EV cars and charger apps allow you to override the schedule and charge immediately at standard rate for that session only. The smart scheduling defaults to off peak on the next session automatically.
Does the charger need to stay connected to WiFi at all times?
Most smart chargers cache their schedule locally and continue to operate on the last known schedule even if WiFi drops temporarily. A sustained WiFi outage (several days) may cause the charger to fall back to a default charging mode. In practice, home WiFi outages long enough to affect scheduled EV charging are rare. We recommend a router with good signal coverage to the driveway as part of the survey assessment.
Is a smart charger more expensive to install than a standard one?
The installation cost (labour, cabling, circuit protection) is identical whether the charger is smart or standard. The charger unit itself is slightly more expensive for smart models. In practice, all OZEV grant eligible chargers are smart, and the OZEV grant covers up to £500 of the unit and install cost. The effective out of pocket cost difference between a smart and a non smart charger, net of grant, is minimal.
Book your Aberdeen smart EV charger survey
At a Faithful Spark free survey, we assess your home, recommend the right smart charger for your tariff and household habits, and advise on the best off peak tariff setup for your situation. The written, fixed price quote includes every applicable grant. Serving Aberdeen, Peterhead, Ellon, Fraserburgh, and wider Aberdeenshire.
Book My Free Smart Charger Survey
Faithful Spark Electricians. NICEIC approved. OZEV listed. Local Aberdeen team. Serving Aberdeen, Peterhead, Ellon, Fraserburgh and across Aberdeenshire.
