Home charging: how much your fleet can save
Charging a fleet vehicle at home costs three to ten times less than on a rapid charger. Shifting part of it to home charging directly cuts TCO.
1Your fleet
To start, two simple figures about your vehicles.
Advanced assumptionsAlready pre-filled with sourced market averages. You can change them to refine with your own figures.modifiable
2Where do your vehicles charge?
Set the share of public and workplace charging, today and tomorrow. The rest happens at home (calculated automatically). No need for exact figures: a rough range is enough to see the savings.
soit 2.4 fois moins cher qu'aujourd'hui, et £1,987/an économisés par véhicule
Energy savings only. The cost of driver time is not included (setting disabled).
Voltaback, the leading software for tracking and reimbursing home charging.
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Charging reimbursement via a vehicle and home connection. No box at all.
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Works in every situation (3-pin plug, charger, block of flats, no smart meter, solar panels, BEV, PHEV…)
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Every charging session is linked to a vehicle, for reliable tracking, with no errors or double reimbursement.
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One dashboard to centralise the fleet: home, workplace and public charging, and ROI…
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Flexible reimbursement via expense claims or fully automated payroll integration.
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Compliance to the highest standard: UK GDPR, ISO 27001, independent accuracy audit, a record per vehicle for HMRC.
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Questions and answers
Understanding the calculation
At home, a kWh costs about 7p overnight on an EV tariff, and 26.32p at the Ofgem price cap (October to December 2026). Charging a 60 kWh battery therefore costs around £4 on an EV tariff, or about £16 at the cap. It is by far the cheapest option, ahead of public rapid charging at about 79p/kWh.
At home, budget around £2 per 100 miles on an EV tariff (about 29 kWh at 7p), or about £7.60 at the Ofgem cap. On a rapid charger, it is nearer £23. For comparison, a petrol car at 45 mpg costs around £17 per 100 miles. The calculator above adjusts this to your actual consumption.
About 7p/kWh off-peak on a home EV tariff (Octopus Go, Intelligent Octopus and similar), and 26.32p/kWh at the Ofgem price cap for October to December 2026, plus a standing charge of 54.83p a day. Domestic electricity is zero-rated for VAT from 1 October 2026 to 31 March 2027. Compare with around 25p at a company charger and about 79p on a public rapid charger (Zapmap).
Yes, on the energy line: it is a recurring gain, separate from the hardware investment. Around three quarters of EV charging in the UK already happens at home (DfT), so the lever is large.
On the energy line, shifting charging from rapid chargers (about 79p/kWh) to home (7p on an EV tariff, 26.32p at the Ofgem cap) cuts the cost of those miles by two thirds to 90 %. For a fleet of 100 vehicles at 20,000 miles a year, every 10 % of energy moved home saves roughly £30,000 to £42,000 a year.
EV tariffs (Octopus Go, Intelligent Octopus, Economy 7 and others) offer cheap overnight hours, often around 7p/kWh. A vehicle plugged in at home charges precisely at night: it benefits from the lowest price, without the driver doing anything.
A public rapid charge ties up the driver for 20 to 30 minutes. If that time is usually productive, it has a cost, which the calculator can optionally value at the cost of one FTE (adjustable share lost). At home, the vehicle charges overnight, without tying up the driver.
Several solutions exist: smart charger, smart cable or tracking software, with very different costs once management is taken into account. The next calculator compares their annual cost.
Find out more: how much does it cost to charge an electric car at home?
Charging an electric car at home costs about 7p/kWh overnight on an EV tariff, and up to 26.32p/kWh at the Ofgem price cap. At a company charger, budget around 25p. On a public rapid charger, the price climbs to about 79p/kWh (Zapmap). The same vehicle can therefore cost three to ten times more depending on where it plugs in.
In terms of use, that is around £2 per 100 miles at home on an EV tariff, about £7.60 at the price cap, and nearer £23 on a rapid charger. A petrol car sits around £17. Home charging remains by far the cheapest option.
For a fleet, the stakes are high: around three quarters of EV charging in the UK already happens at home (DfT). For a company car, the employer can reimburse 100 % of that home electricity, private use included, with no tax and no NIC. Shifting more charging to home, while reimbursing each driver at the real price of their own tariff, lowers the bill every year. It is a direct, recurring TCO lever, with no hardware investment to pay off.
Methodology and sources
Sources and assumptions:
- Home electricity price: Ofgem energy price cap, October to December 2026 (26.32p/kWh plus 54.83p a day), and home EV tariffs at about 7p/kWh off-peak.
- Home vs public charging cost per mile: HMRC advisory fuel rates (7p per mile at home, 15p in public, since 1 September 2026).
- Public charging prices: Zapmap Charging Price Index, 2026 (rapid about 79p/kWh).
- Electricity price cap: Ofgem.
Figures are orders of magnitude, updated 11/2026.
- Ofgem: energy price cap
- GOV.UK: advisory fuel rates
- Zapmap: Charging Price Index
- Energy Saving Trust: charging electric vehicles
- GOV.UK: grants for low-emission vehicles and chargepoints
Our kWh price assumptions for 2026
The calculator uses UK 2026 reference prices, which you can adjust. The kWh price varies widely depending on where you charge, which explains the difference in savings between home and public charging.
Charging location | kWh price 2026 | Cost per 100 miles (29 kWh) |
|---|---|---|
Home, EV tariff (off-peak) | about 7p | about £2 |
Home, Ofgem price cap | 26.32p | about £7.60 |
Public AC charger | about 50 to 55p | £14.50 to £16 |
Rapid DC charger | about 79p | about £23 |
Ultra-rapid charger (motorway) | 80p or more | £23 or more |
Sources: Ofgem / GOV.UK advisory fuel rates and Zapmap 2026. Reference consumption 18 kWh/100 km (about 29 kWh per 100 miles).
Fleet savings examples
Fleet of 50 vehicles, 15,000 miles a year, 70 % home charging on an EV tariff: moving that energy from rapid chargers to home saves around £2,000 per vehicle per year. Charging at home rather than on rapid chargers divides the energy cost by three (at the price cap) to ten (on an EV tariff).
Once the savings are quantified, the next step is to secure them: reimburse each driver at real cost, tax- and NIC-free for company cars, with a record per vehicle that stands up to HMRC, without installing a charger. Have my savings validated by a Voltaback expert.