Broadband and Power Bundles in NZ — Do They Save Money?

Broadband and Power Bundles in NZ — Do They Save Money?

Bundles are sold on a simple promise: one bill, one provider, less money out the door each month. The discount is usually real. What's less obvious is where that discount can possibly come from — and that's the part most advertising skips over.

Here's the fact that changes how you should think about bundling. Your power bill is really two bills stapled together. One comes from the lines company that owns the poles and wires in your street. The other comes from the retailer that buys the electricity and sends you the invoice. You choose the retailer only. The lines charge follows your address and is identical no matter who bills you.

So a bundle can only ever trim the retail margin and the overhead of running a second account. It cannot touch the regulated network component, because nobody competes on that. Once you know which slice of the bill is actually in play, the question stops being "is this bundle good?" and becomes "is this bundle good enough to beat my best two separate deals?"

How We Researched This Guide

We started with the Electricity Authority's explanation of how a power bill is built, because if you don't understand the daily charge and the variable charge, bundle maths is guesswork. From there we worked through MBIE's material on the low fixed charge phase-out and the Commerce Commission's telecommunications monitoring, which gave us the switching figures we lean on later.

One thing surprised us. Electricity retailers are not required to show the unit price of electricity on your bill, and some display rates excluding GST while others include it. The Electricity Authority also publishes some network figures GST-exclusive, while retail bills are normally GST-inclusive. A 15 per cent gap between two numbers can be a units difference, not a price difference. The rules on the low fixed charge tariff option are set out in full on legislation.govt.nz if you want the detail.

The Quick Summary (60-Second Version)

If you only read one part, read this.

• A bundle can only discount the retail side of your power bill — the lines charge is fixed to your address and identical whoever bills you.
• Only 5 per cent of mobile consumers changed providers in the year reported, and residential broadband switching fell from 12 per cent to 10 per cent.
• The low fixed charge regulations phase out over five years from 1 April 2022, with the maximum rising $0.30 each April until removal on 1 April 2027.
• Low-use households should re-check their plan every April, because the low-user trade-off shifts each time the maximum daily charge rises.
• Pricing is the lowest-rated area of satisfaction across both mobile and broadband, according to the Commerce Commission.
• From 30 October 2026, power bills must explain charges in clearer, more consistent plain language.

Why the Bundle Discount Is Smaller Than It Looks

Every power bill is a fixed daily charge in cents per day plus one or more variable charges in cents per kilowatt-hour. The daily charge is paid whether or not you use any power — which is why an empty holiday house still gets a bill. It covers meter rental, reading, billing and account overheads, and in most cases a fixed fee from the network company.

The variable charge covers the electricity you actually use, plus a variable network fee. Anything else on the bill is a breakdown of those two, a discount applied to them, or GST. Hot water usually sits on a controlled circuit, which the lines company can switch off briefly at peak times in exchange for a lower rate.

What the retailer actually controls

The retailer sets its own margin and its own account costs. That's the pool a bundle discount comes from. If a provider offers a bundle, it is effectively saying it will share some of the saving it makes from billing you once instead of twice, and from keeping you as a customer.

That saving is real but bounded. It also means the discount has nothing to do with how much power you use, and everything to do with how much the provider values your custom.

The Low User Maths Changes Every April

The Electricity (Low Fixed Charge Tariff option for Domestic Consumers) Regulations 2004 once required retailers to offer a low fixed charge option capped at no more than $0.30 a day, excluding GST but after any prompt payment discount. The government is phasing that out over five years from 1 April 2022, lifting the maximum by $0.30 each year until it roughly matches the standard fixed charge.

A low fixed charge plan trades a lower daily charge for a higher per-unit rate. If you use very little power, that trade has historically worked in your favour. As the maximum daily charge climbs each April, the trade-off moves against low users.

Throughout the phase-out, retailers must keep offering low fixed charge options. Households using under 8,000 kWh a year — or 9,000 kWh in the lower South Island, meaning Christchurch and below but excluding the West Coast — must pay less on a low fixed charge option than on any corresponding alternative. After 1 April 2027, no retailer will be required to offer one at all.

Bundling Versus Staying Separate

The honest framing here is that the main reason people overpay isn't that better plans are hidden. It's that they never move. The Commerce Commission found only 5 per cent of mobile consumers changed providers in the year reported, down from 6 per cent, and described it as persistent inertia. Residential broadband switching fell from 12 per cent to 10 per cent over the same period.

A 2019 mobile market study found high levels of customer inertia, and later reviews of consumer bills indicated many people were overspending because they sat on plans that didn't match their usage. That's the real comparison a bundle has to beat — not a competitor's advertisement, but your own willingness to review your plan once a year.

Where a bundle genuinely wins

If you were never going to shop around anyway, a bundle discount is money you'd otherwise have left on the table. It also simplifies your admin, and a single point of contact has real value when something goes wrong.

Where it loses is when the discount is temporary and the base rates underneath it are unremarkable. A bundle that saves you money for twelve months and then quietly reverts is not a saving. It's a deferral.

Questions You Might Have

Can a bundle ever reduce the lines charge?

No. The lines component comes with your address and is the same whoever sends the bill. The Commerce Commission regulates Transpower, the lines companies and gas pipeline businesses as natural monopolies, setting maximum average prices and minimum quality standards. That's why a bundle can only discount the retail portion.

I use very little power. Should I still be on a low user plan?

Check it every April, because the maximum daily charge rises then. The gap between low user and standard narrows each year, and after 1 April 2027 retailers won't have to offer a low fixed charge option at all. Do the comparison with your own annual usage rather than assuming last year's answer still holds.

Why does my neighbour pay a different rate for the same power?

Partly because they're on a different retailer's plan, and partly because the network charges differ by location and customer type. Lines companies are still largely free to set the price for an individual customer. You can find out which lines company serves your address, and that component isn't something retailers compete on.

Is one bill actually cheaper to run?

For the provider, yes — one account instead of two. Some of that saving gets passed to you as a bundle discount, which is why the discount exists at all. Whether it's enough depends entirely on what the same two services would cost you separately, including any promotional pricing that expires.

What's changing on power bills?

From 30 October 2026, information on power bills will be clearer and more consistent, with charges explained in plain language. The intent is to make comparing plans easier. In the meantime, remember that some retailers show rates excluding GST and others include it, and levy treatment varies too.

What Matters Most

The bundle discount is genuine, but it comes from a small slice of your power bill. Everything else — the lines charge, the network fees, the levies — is the same regardless of who sends the invoice. So the question isn't whether bundles save money in general. It's whether this bundle beats your best two separate deals, after any promotional period ends.

What we'd actually push you towards is the habit, not the bundle. Review your power plan every April when the low fixed charge maximum moves. Review your broadband plan once a year. Pricing is the lowest-rated area of satisfaction across both mobile and broadband, and the switching figures suggest most people simply don't bother.

A reader who checks their plans annually is already doing the thing the regulator says most households fail to do. That habit will save you more over five years than any single bundle discount.