Charging at home · 4 min read
EV Energy Tariffs Explained
How EV-specific tariffs work, how to pick one, and how to make overnight charging as cheap as possible.
Why EV-specific tariffs exist
Energy suppliers want to encourage charging when grid demand is low (overnight). Many offer EV tariffs with very cheap off-peak rates — often less than half the standard daytime rate — in exchange for slightly higher rates at other times.
What to look for in a tariff
- ✓The off-peak window — do the hours suit your routine?
- ✓The off-peak rate itself in pence-per-kWh
- ✓Whether it requires a smart meter (most do)
- ✓Whether it needs a specific smart charger or app
- ✓Standing charges and daytime rates — look at the full picture
Is it worth switching?
Rough estimate: take your annual mileage, divide by your car's real miles-per-kWh, and multiply by the difference between your current rate and the EV off-peak rate. For most daily drivers, the saving from a dedicated EV tariff comfortably outweighs any daytime rate rise — provided most charging happens overnight.
Other ways to save
- ✓Workplace charging is often free or heavily subsidised
- ✓Solar + battery storage can pair well with smart charging
- ✓Ultra-rapid public charging is the most expensive per mile
A simple approach for new EV owners
- ✓Get a smart meter if you don't already have one
- ✓Compare 2–3 EV-specific tariffs
- ✓Match the off-peak window to your routine, not the headline rate
- ✓Set your charger or car to charge automatically in that window
- ✓Revisit annually — tariffs and rates change
Heads up: Carautonomy is for general guidance only. Always check your car's handbook, your energy supplier and current UK government guidance for the specifics that apply to your setup.