EV Running Costs Explained — What Does It Cost to Run an Electric Car in New Zealand?

Two factors drive your EV running cost: the vehicle's energy efficiency and the electricity price you pay.

Energy efficiency is measured in kWh per 100 km — how much electricity the vehicle uses to travel 100 kilometres. A typical EV in New Zealand uses around 16 kWh per 100 km. Smaller, more efficient models may use 12 to 14 kWh per 100 km, while larger SUVs and performance vehicles can use 18 to 22 kWh per 100 km.

The electricity price depends on where and when you charge. Home charging on a standard rate costs around $0.39 per kWh, off peak rates are around $0.25 per kWh, and dedicated EV tariffs can be as low as $0.12 per kWh. Public charging is more expensive, with DC fast charging typically around $0.68 per kWh and ultra rapid DC chargers around $0.95 per kWh.

The formula is straightforward:

EV efficiency (kWh per 100 km) × Electricity price ($ per kWh) = Cost per 100 km

If you select your vehicle and set your electricity rate in the My EV panel, the reference tables throughout this guide and every calculator on the site update automatically to show running costs based on your vehicle's actual efficiency and the rate you pay.

The cost per kilometre is the most practical way to understand EV running cost because it lets you compare directly with petrol vehicles and estimate costs for any distance.

At a standard home rate, the running cost is about 6.2 cents per km. On a dedicated EV tariff, it drops to just 1.9 cents per km. For context, a medium petrol car doing 8 litres per 100 km at $3.00 per litre costs 24 cents per km — roughly three to four times more than a home-charged EV.

To estimate your monthly or annual running cost, multiply the cost per 100 km by your driving distance.

EV efficiency × Annual distance ÷ 100 × Electricity price = Annual cost

The electricity price you pay depends on when and where you charge. This makes charging behaviour one of the biggest levers for controlling your EV running cost.

Home charging — cheapest option

Charging at home overnight is usually the cheapest way to run an EV. Most EV owners do the majority of their charging at home, either on a standard residential rate or an off peak tariff. A dedicated EV tariff at $0.12 per kWh makes home charging extremely cheap — under $200 per year for typical driving distances.

Mixed charging — typical scenario

Most EV owners use a mix of home and occasional public charging. If 80% of charging is done at home on a standard rate and 20% on public DC fast chargers, the blended annual cost for 15,000 km would be approximately $888 — still well under half the equivalent petrol cost.

Public charging only — most expensive

Relying exclusively on public DC fast charging at $0.68 per kWh pushes the annual cost to $1,560. Ultra rapid DC charging at $0.95 per kWh would cost $1,920 per year. This is still cheaper than petrol for most vehicles, but the cost advantage is significantly reduced. Drivers without home charging access can reduce costs by using public AC chargers where available, which are typically cheaper per kWh than DC fast chargers.

Regardless of how you charge, an EV is almost always cheaper to run per kilometre than a comparable petrol vehicle. The size of the saving depends on the electricity price and the petrol price.

Even at DC fast charging prices, the EV saves meaningfully per year compared with petrol. At a home standard rate, the saving is substantial. On a dedicated EV tariff, the saving is large enough to make a meaningful impact on the total cost of ownership.

Vehicle size and efficiency affect running cost. Larger, less efficient EVs cost more per kilometre than smaller ones, though they are still cheaper than their petrol equivalents.

EV costs based on home standard rate of $0.39 per kWh. Petrol costs based on $3.00 per litre. Vehicle type fuel use presets from locked calculator values.

Regenerative braking is one of the less obvious cost benefits of driving an EV. When you lift off the accelerator or brake, the electric motor runs in reverse and acts as a generator, converting kinetic energy back into electricity and feeding it into the battery.

Energy recovery

The amount of energy recovered through regenerative braking varies depending on driving conditions. In stop-and-go city driving, regen can recover a meaningful amount of energy — extending range and effectively reducing the amount of electricity you need to buy from the grid. On a long, flat highway it contributes less, but in urban and suburban driving it adds up over time.

Reduced brake wear

Because regenerative braking handles much of the deceleration, the physical brake pads and discs are used far less than in a petrol vehicle. Many EV owners find their brake pads last significantly longer — in some cases lasting the life of the vehicle. This reduces one of the routine maintenance costs that petrol vehicle owners face regularly.

Neither the energy recovery nor the brake savings are dramatic on their own, but combined and compounded over years of ownership they contribute meaningfully to the total cost advantage of an EV.

Having an EV registered to your address can unlock access to electricity plans that are not available to non-EV households. Several New Zealand electricity retailers offer EV-specific plans with significantly lower rates for overnight charging.

How EV plans work

EV electricity plans vary by retailer. Some offer a dedicated EV tariff with rates as low as $0.12 per kWh during overnight hours as part of a time-of-use plan. Others offer discounted off peak rates across your whole household electricity supply when you sign up as an EV owner.

The setup depends on your situation — your electricity distributor, whether you have single or three-phase power, and whether a separate meter is required. It is worth comparing the available EV plans in your area, as the right plan can reduce your charging cost by 50 to 70 percent compared with a standard residential rate.

Finding the right plan

Different plans suit different circumstances. If you have solar panels, a plan with a good buy-back rate and a low off peak rate may be ideal. If you charge exclusively overnight, a dedicated EV tariff with the lowest possible overnight rate may save the most. Comparing plans through an energy comparison service or checking directly with retailers that offer EV plans is the best starting point.

Owners with rooftop solar can charge their EV using excess solar generation during the day, effectively reducing the cost of charging to near zero for those kilowatt hours.

Solar charging

If your EV is parked at home during daylight hours and your solar system is generating more electricity than the household is using, the excess can go straight into the car instead of being exported to the grid at a low buy-back rate. This makes the effective cost of that electricity very low — in many cases better than even the cheapest EV tariff.

Solar with battery storage

A home battery storage system takes this a step further. Excess solar generated during the day is stored in the home battery and can be used to charge the EV overnight — even when the sun is not shining. This means you can charge your car from solar energy regardless of when you plug in, further reducing your reliance on grid electricity.

Cost perspective

The upfront cost of a solar and battery system is significant, but it is important to recognise that the investment covers your entire household electricity use — not just the EV. The EV benefits from a system that is already reducing your power bills across lighting, appliances, heating and cooling. In that context, the marginal cost of adding EV charging to an existing solar setup is very low.

For households that already have solar or are considering it, the combination of solar generation, battery storage and an EV creates a compounding cost benefit that grows over time.

Electricity is the main ongoing running cost for an EV, but there are other costs to factor in.

Tyres

EVs tend to be heavier than equivalent petrol vehicles due to the battery, and the instant torque of an electric motor can increase tyre wear. Tyre replacement costs are similar to petrol vehicles, though some EV-specific tyres designed for lower rolling resistance and noise may cost slightly more.

Servicing

EVs have significantly fewer moving parts than petrol vehicles — no engine oil, no spark plugs, no timing belts, no exhaust system. Most EVs also use a single-speed transmission rather than a complex multi-speed gearbox, which means one less mechanical system to maintain or repair. Combined with reduced brake wear from regenerative braking, this means servicing costs are generally noticeably lower than for a petrol vehicle. Routine EV maintenance typically includes brake fluid, cabin air filter, tyre rotation and multi-point checks.

Insurance

Insurance premiums for EVs have been higher than petrol equivalents in some cases, partly due to higher purchase prices and repair costs. This gap has been narrowing as insurers gain more experience with EVs and repair networks expand.

Registration and road user charges

Registration for an EV is broadly comparable to an equivalent petrol car. The line item that does apply, and that petrol drivers do not see separately, is road user charges: the exemption for light electric vehicles ended on 1 April 2024, and EVs now pay RUC at $76 per 1,000 km like other light vehicles that do not pay fuel excise. The road user charges calculator works out the annual cost for a given distance.

Because petrol drivers pay for road funding through excise included in the pump price, RUC is not an extra cost unique to EVs so much as the same cost collected a different way. It does need adding to an EV running-cost estimate, though, and the totals on this page include it.

Purchase incentives

There are currently none. The Clean Car Discount, which paid rebates on low emission vehicles and charged fees on high emission ones, ended on 31 December 2023. Since then an electric vehicle has been bought on its own merits, without a subsidy narrowing the purchase price gap against a petrol equivalent.

That makes the running cost arithmetic on this page more important rather than less. With no rebate reducing the up-front difference, the case for an EV rests on what it costs to run over the years you keep it — which is exactly what the figures above set out, road user charges included.