Power Companies NZ: Compare Electricity Providers and Save

Electricity is one of the biggest recurring household costs in New Zealand, and with dozens of retailers competing for your custom, the gap between the best and the worst deal for an average home can top $400 a year. Yet most New Zealanders stay with whoever they signed up with when they moved in — often the default a landlord or previous owner left behind. That inertia is expensive. This guide explains how the power market actually works, what separates the players, how to compare plans properly, and how to switch without the hassle, so you can redirect the savings to something more useful. It is general information, not financial advice.

How the New Zealand electricity market is structured

Before you can compare meaningfully, it helps to understand that your bill covers two very different jobs. First, the electricity has to be generated and delivered across the national grid and your local lines network — those wires are a regulated monopoly in each region, so you cannot shop around for them. Second, a retailer buys wholesale power, bundles in the network costs, and sells you a plan. Switching changes only the retailer; the physical supply, the poles and the wires stay exactly the same. That is why there is never a disconnection, a site visit or an interruption when you move companies.

Retailers fall into two broad camps. A gentailer is a company that both generates electricity and retails it — the “gen” and the “tailer” combined. New Zealand has four large ones. Everyone else is an independent retailer that buys power on the wholesale market rather than generating its own. The four gentailers together serve roughly 85% of households and generate close to 90% of the country’s electricity, but independents have steadily grown their share and frequently top customer-satisfaction surveys — so size is not a measure of quality or value.

Who the retailers are

Rather than rank them — the right fit depends on your usage, your region and whether you can shift load to off-peak times — here is a factual picture. The four gentailers are Contact (broad plan range, free overnight power windows popular with EV owners), Genesis (fixed-price plans, app-based reward hours and gas bundling), Meridian (a 100% renewable generation portfolio), and Mercury (digital-first, having absorbed the former Trustpower retail book). Among the independents, Electric Kiwi is known for a daily free “Hour of Power” off-peak and keen unit rates, Octopus offers smart time-of-use tariffs, Powershop sells prepaid power “packs” (and is itself owned by Meridian), and Nova bundles gas with electricity. Flick pioneered transparent spot-price pass-through, though its customer book was acquired by Meridian in 2025 — a reminder that the retail landscape consolidates over time.

The headline point is simple: whichever retailer you consider, compare on the total annual cost for your own usage, not the advertised unit rate, and always check the current plans directly because specific offers change month to month.

Understanding the plan types and your bill

The cheapest unit rate does not always produce the cheapest bill — the structure matters just as much. On any New Zealand power bill the key components are:

• Unit rate — cents per kilowatt-hour (kWh) of electricity you use; this drives most of your variable cost.
• Daily fixed charge — a flat fee for simply being connected, charged every day regardless of how much you use.
• Lines (network) charges — set by your local distributor and passed through by the retailer; these are not negotiable and vary by region.
• GST — the 15% goods and services tax applies to power, so always compare GST-inclusive figures. Our GST calculator guide explains how it is added.
• Prompt-payment discount — some advertised rates only apply if you pay on time, so read the fine print before assuming the headline price.

Plans themselves come in a few flavours. Fixed-rate (standard) plans charge the same unit rate around the clock and suit households that want predictability. Time-of-use plans charge less off-peak and more at peak and reward anyone who can shift heavy use — dishwashers, EV charging, hot water — to cheaper windows. Spot-price plans pass the half-hourly wholesale price straight through: they can be very cheap when hydro lakes are full and demand is low, but prices can spike sharply in a cold snap or a dry winter, so they suit engaged users who can actively monitor and respond.

Historically, retailers also had to offer a regulated low-user plan with a capped daily charge, designed for small households. That is being phased out. The maximum low-user daily charge has risen 30c each April and reached $1.80/day from 1 April 2026; the regulation is removed entirely on 1 April 2027, after which retailers no longer have to offer a discounted low-user option. The low-user advantage is therefore shrinking — run the numbers now, and re-compare once the change lands.

How to compare, switch and save

The free, independent place to start is powerswitch.org.nz, run by Consumer NZ. The vast majority of New Zealand homes now have a smart meter, which records usage in 30-minute intervals. If you enter your ICP number — the 15-character Installation Control Point code printed on your bill that uniquely identifies your property’s grid connection — the tool can model up to 12 months of your actual half-hourly usage against every plan available in your area, far more accurately than eyeballing unit rates. You do not need a smart meter to switch, but you do need one for time-of-use or spot-price plans.

Once you have found a better plan, the mechanics are straightforward: sign up with the new retailer and they handle the switch for you, usually within about two to ten working days. If you are on a fixed-term contract, check for a break fee first — though the annual savings often outweigh it. When the switch completes, check your final bill from the old retailer for an accurate meter read, and set an annual reminder to re-compare, because deals expire and your usage changes. It is also worth knowing your rights: the Electricity Authority’s Consumer Care Obligations have been mandatory rules in the industry Code since 2025, requiring retailers to treat disconnection as a last resort, keep charges reasonable, and protect medically dependent consumers.

Beyond switching: cutting your consumption

Choosing the right retailer caps your rate; using less power cuts the quantity. In New Zealand’s climate, heating dominates household electricity use, so the biggest wins are there:

• Insulate. A warm, dry home needs far less heating. The EECA Warmer Kiwi Homes programme offers subsidies for insulation and efficient heating to eligible households.
• Use a heat pump. A modern heat pump delivers roughly three to four units of heat for every unit of electricity, so it is far cheaper to run than a plug-in bar heater and typically pays for itself within a few years.
• Mind your hot water. The cylinder is around 30% of a typical bill, so heating it overnight on a time-of-use plan, or fitting a timer, makes a real dent.
• Charge an EV overnight on a time-of-use or free-overnight window rather than at peak.
• Compare solar buy-back. If you have panels, retailers’ rates for the surplus you export vary widely, so it pays to shop that too.

Then redirect what you save. Even $200–$400 a year does more good in a high-interest savings account, in extra KiwiSaver contributions, or against debt than it does overpaying a power company. Trimming your other household bills helps too — it is worth re-checking your broadband and mobile plans on the same day, and running the lot through a household budget. Our money-saving tips cover the quick wins.

Green credentials

New Zealand has one of the highest proportions of renewable generation in the world — around 88.5% in 2025, mostly hydro, geothermal and wind, with records above 96% in favourable quarters. Because the grid is shared, though, the electrons reaching your home are a national mix regardless of which retailer you pick. What differs is a retailer’s own generation: Meridian generates 100% from renewables; Contact runs a geothermal and hydro portfolio; and Genesis operates the Huntly coal and gas station as a dry-year back-up, a point some environmentally motivated customers weigh. If green credentials matter to you, look for retailers that can demonstrate their generation mix rather than taking marketing claims at face value.

Disclaimer: This article is general information about choosing an electricity retailer in New Zealand. It is not financial advice and not a recommendation of any provider or plan. Plans, prices and providers change frequently — always compare current plans for your own usage and region before switching. Regulated low-user pricing is being phased out by 1 April 2027, which will change the comparison. For budgeting help, see Sorted (sorted.org.nz).

Frequently asked questions

Which power company is cheapest in NZ?

There is no single cheapest company for everyone. It depends on your region, your local lines company, how much power you use and when. The reliable way to find the cheapest option for your situation is to enter your ICP number on Powerswitch (run by Consumer NZ), which models your actual annual cost across the plans available in your area.

How do I find my ICP number?

It is printed on your electricity bill — a 15-character code unique to your property’s grid connection. You can also ask your current retailer for it. You need it to get accurate comparisons and to sign up with a new retailer.

Is it free to switch power companies?

Yes, in most cases. There is no disconnection or reconnection because the same network delivers your power regardless of retailer. If you are on a fixed-term contract, check for a break fee, but even then the annual savings from switching often exceed it.

What is happening to low-user electricity plans?

The regulated low fixed charge is being phased out. The maximum low-user daily charge rose 30c each April, reaching $1.80/day from 1 April 2026, and the regulation is removed on 1 April 2027 — after which retailers no longer have to offer a discounted low-user plan. So the low-user advantage is shrinking; run the numbers now and re-compare when the change lands.

Are spot-price plans worth it?

They can save engaged households money when wholesale prices are low — mild, wet weather when hydro lakes are full — but during dry winters or cold snaps prices can spike sharply. They suit people who can actively monitor prices and shift their usage, not those on fixed incomes or with little flexibility.