How EV Charging Costs Have Changed With NZ Power Prices

One of the original selling points of EV ownership in NZ was simple: electricity is cheaper and more stable than petrol. That's still broadly true, but power prices have moved more than most owners realise over the past few years, and the gap between EV running costs and petrol has narrowed slightly even as it remains firmly in the EV's favour. Here's what's actually happened to the numbers.

Where power prices have actually gone

Residential electricity prices across the major NZ retailers (Contact, Mercury, Genesis, Meridian) have risen from an average of roughly 28–30 cents per kWh a few years back to around 34–38 cents per kWh on standard plans in 2026, driven by a mix of transmission cost increases, generation investment being passed through, and general inflation across the sector. That's a rise of roughly 20–25% over the period — meaningful, but nowhere near the swings seen in petrol prices over the same stretch, which have ranged from lows around $2.55/litre to highs above $3.15/litre depending on international oil prices and currency movements.

What this means for actual charging costs

For a typical EV doing 14,000 km a year at around 16–18 kWh/100km real-world consumption:

Year (approx.)	Avg. residential rate	Annual home charging cost (14,000 km)
3 years ago	29c/kWh	$650–$730
Today (2026)	36c/kWh	$810–$910

That's an increase of roughly $160–$180 a year in home charging costs. Over the same period, the equivalent petrol car doing 14,000 km at 7.5 L/100km would have gone from roughly $2,010/year to $2,340/year at current pump prices — an increase of $330 in dollar terms, and still a far larger absolute cost. The EV remains dramatically cheaper to run; the rate of cost increase has simply been less lopsided in the EV's favour than it was three years ago.

Off-peak plans are where the real savings still are

The single biggest lever EV owners have against rising power prices is time-of-use and EV-specific plans. Several retailers now offer dedicated EV plans with off-peak rates as low as 12–16 cents per kWh overnight (typically 9pm–7am or similar windows), against standard daytime rates of 38–44 cents/kWh on the same plans. An owner charging predominantly overnight on one of these plans can bring their annual charging cost for 14,000 km down to roughly $340–$450 — less than half the standard-rate cost, and a fraction of petrol.

The catch is that these plans often carry a higher daily fixed charge or higher daytime rates, so they only pay off if you can genuinely shift most charging to the off-peak window — workable for home charging with a timer or smart charger, less useful for anyone relying mainly on public charging during the day.

Public charging costs have risen faster than home rates

This is the area owners are most likely to notice and be frustrated by. DC fast charging rates from networks like Chargenet, BP Pulse, and Z have risen from roughly 45–55 cents/kWh a few years ago to 65–85 cents/kWh in 2026 at many sites, reflecting both higher wholesale electricity costs and network investment being recovered through per-kWh pricing. For an owner relying heavily on public fast charging rather than home charging, this materially changes the economics — a full charge that cost $22–$28 a few years back can now cost $34–$44 at the same site.

This is pushing a growing share of EV owners toward maximising home charging and treating public fast charging as a top-up-only tool for longer trips, rather than a primary charging method, which is the cost-efficient approach regardless of where prices head next.

Solar and EV charging combinations

With power prices rising, more NZ homeowners are pairing rooftop solar with daytime EV charging to sidestep retail rates almost entirely. A household with a 6.5 kW solar system generating a surplus during the day can realistically cover 60–75% of a typical EV's annual charging needs from self-generated power, worth genuinely modelling if you're already considering solar for other reasons — the EV becomes a very effective way to "use up" surplus solar generation that would otherwise be exported at low buy-back rates (often just 8–12 cents/kWh).

How this compares across regions

Power pricing in NZ isn't uniform, and the retailer landscape varies meaningfully by region, which affects how much of the off-peak saving is actually achievable. Auckland and Wellington households generally have the widest choice of EV-specific retail plans, while some smaller regional networks (parts of the lower North Island and the West Coast) have fewer EV-plan options and correspondingly smaller gaps between peak and off-peak rates — sometimes as little as 6–8 cents/kWh difference rather than the 20+ cent gap available in bigger centres. If you're weighing up an EV purchase partly on projected running costs, it's worth checking what plans are actually available at your specific address rather than assuming national averages apply directly to your situation.

The bottom line

EV charging costs have risen alongside general power price inflation in NZ, but they've risen more slowly in dollar terms than petrol, and the gap in favour of EVs has actually widened slightly over the past few years when measured in absolute annual savings, even though the percentage increase in charging costs looks larger on paper. The practical lesson for current and prospective owners is the same regardless of where prices go next: prioritise home charging on an off-peak or EV-specific plan, and treat public DC fast charging as an occasional convenience rather than a routine cost, because that's where the pricing has moved least in owners' favour.