EV home charging cost in NZ (2026 figures)

A typical NZ-spec electric car uses 0.18 kWh per km (small hatch) to 0.22 kWh per km (mid-size SUV) over real driving. At Christchurch's current 36.6 c/kWh flat rate, that works out to between 6.6c and 8.1c per km at the wall, before charging losses.

Tack on roughly 8-12% for AC charging losses (the inverter in your car wastes some power converting AC from your wall to DC for the battery), and you land at around 7-9 cents per km all-in on a flat-rate plan.

Petrol equivalent at $3.42/L (the average NZ 91-octane price in early April 2026) and a typical 7 L/100km is about 24 cents per km. So home-charged electric driving comes in at roughly a quarter to a third of the per-km fuel cost of an equivalent petrol car.

What that adds to your monthly power bill

Per-month addition to your bill, by weekly distance, assuming 0.18 kWh/km, Christchurch rate:

• 100 km/week (school runs, occasional trips): about 78 kWh/month, or $28/month.
• 250 km/week (typical urban commute): 196 kWh/month, or $72/month.
• 400 km/week (long commute, two-EV household): 313 kWh/month, or $115/month.
• 700 km/week (rep on the road): 549 kWh/month, or $201/month.

How much you save by charging at night

EV home charging is the textbook case for a Day/Night tariff. Plug in when you get home, schedule the car (or the charger) to start after 11pm, and 90% of your charging happens at the night rate.

Same Christchurch household with day rate 41c, night rate 22c:

• 250 km/week, 90% charged overnight: 196 kWh/month, of which ~176 kWh at 22c + ~20 kWh at 41c = $47/month. Saves $25/mo, or $300/year, against the flat-rate scenario above.
• 400 km/week, overnight: 313 kWh, ~282 at 22c + ~31 at 41c = $75/month. Saves $40/mo, $480/year.

For high-mileage EV households, switching to a Day/Night plan and scheduling overnight charging is one of the highest-value tweaks available, second only to having the EV in the first place.

Things that change the numbers

• Cold winter mornings: an EV uses 15-25% more energy per km in winter, partly from cabin heating, partly from cold battery chemistry. Budget closer to the high end of the per-km figures above for July and August.
• Pre-heating while plugged in: if you set the car to warm up while still on the charger, the heating energy comes from the wall not the battery. Cheaper, and you start the trip with the cabin already warm.
• Wallbox vs three-pin: a 7 kW wallbox charges 5-6x faster than a regular 10A socket, but uses the same total kWh per km. The kWh per km does not change. Wallboxes mainly buy you the option to top up to full overnight even on shorter plug-in windows.
• Public DC fast chargers: typically 60-100c/kWh, two to three times the cost of home charging. Use them on road trips, not as a daily habit.
• Solar at home: if you have a PV system and can charge during the day on excess generation, your effective per-km cost can drop close to zero.

What about line losses on the network?

You may have read that EVs add to network costs, and that line-companies in NZ are starting to charge time-of-use peaks. This is true but small for residential-scale charging. The 7 kW wallbox is similar to running an oven plus a kettle plus a hot water cylinder simultaneously, so EVs are not particularly disruptive at the household level. As a rule, charging outside the 5pm-9pm peak window also keeps you on the right side of any future peak-rate charges your retailer introduces.

Plug your weekly km and your retailer's day/night rates into the NZ Power Bill Calculator to see exactly what your EV adds. The EV charger row is in the "Other" section.

Related guides

• Are NZ Day/Night power plans worth it? - overnight EV charging is one of the strongest cases for switching plans
• Average NZ power bill by region (2026) - put your EV charging addition in context against the regional baseline