If you charge at a Gridserve fast charger, as you might find at a motorway service station, you can look forward to paying 66p/kWh [1] for electricity.

On the other hand, an industrial user of electricity might pay 22p/kWh [2] so these fast chargers have a big profit margin.

[1] https://www.gridserve.com/our-pricing/ [2] https://assets.publishing.service.gov.uk/government/uploads/...