EV Charging Cost Calculator

Once a business has more than a handful of EVs on site, fuel cost stops being a payroll line and becomes a procurement question. Depot charging at 22p per kWh looks different to forecourt rapid charging at 79p, and the answer feeds back into vehicle TCO, lease decisions, and whether the next van order is electric or diesel. Facilities leads, fleet managers, and finance directors all need a defensible number per mile, and that number changes every time the contracted electricity price changes or a new bank of chargers comes online.

The harder problem is recovery. If staff are charging company cars at home, HMRC currently allows a flat reimbursement rate, but actual home tariffs vary from 7p on a smart off-peak slot to 30p on a fixed standard rate. A 200-vehicle fleet covering 25,000 miles per car can swing £80,000 either way depending on how charging time, tariff selection, and reimbursement policy are set up. Salary-sacrifice schemes only stack up if the energy maths behind them is honest.

Purely Energy works with multi-site operators rolling out depot charging, and the conversations that come up most are time-of-use tariff selection, half-hourly metering on new charger circuits, capacity headroom on the existing MPAN, and how the additional load reshapes the site's overall demand profile. Getting the charger commercials right starts with knowing the unit cost of a kWh delivered, and ends with a procurement strategy that lines up with when the vehicles actually plug in.