What does off-peak power mean in New Zealand?

"Off-peak" comes up a lot when people talk about power plans, usually with the promise of lower rates attached. But what does it mean, why does the time of day change the price, and why do the hours seem to shift depending on where you live?

This guide clears up the terms and the reasons behind them, so you can work out whether an off-peak plan fits the way your household uses power.

Peak and off-peak, in plain terms

Off-peak refers to the times of day when demand on the electricity system is lower. Overnight and late evening tend to be the quietest. Mornings and early evenings, when most households are cooking, showering and running appliances at the same time, are typically the busiest.

The Electricity Authority, which regulates New Zealand's electricity industry, describes the typical pattern like this.

These are typical patterns, not fixed national rules. Each plan sets its own hours, which is where a lot of the confusion comes from.

Electricity is mostly used as it's generated

Most electricity is generated to meet current demand, with it being used at roughly the same time rather than stored. When demand climbs, like at dinner time, or when there is a cold snap, the system has to call on more generation to keep up, and the extra supply brought on at busy times tends to cost more. When demand drops, it's easier and cheaper to meet.

The network is built for the busiest moments

The poles, wires and substations that carry power to your home need to handle the peaks, even though those peaks only last a few hours a day. Using more of that capacity at quieter times makes better use of what's already there.

Time of use pricing reflects both

Time of use plans pass some of that difference on to households. Power used in quieter hours is priced differently to power used in busier ones, because the cost of supplying it changes depending on how much the overall system is being asked to do at the time.

It's also why shifting some of your usage helps more than just your own bill. Every load that moves out of the evening peak is one less thing the system has to cover at its busiest.

• Time of use: A plan where the price of each unit of electricity depends on when you use it.

• Peak: The busiest parts of the day, usually weekday mornings and early evenings.

• Off-peak: Quieter periods when demand is lower. Some plans use this for their lowest-rate hours, while others use it for a middle band.

• Shoulder: The in-between periods either side of a peak, on plans that have three price bands.

• Night rate: A lower rate that applies overnight on some plans.

• Kilowatt hour (kWh): The unit your electricity is measured and charged in. A 2 kW heater running for an hour uses 2 kWh.

• Smart meter: A meter that records your usage in half-hour blocks and sends it back remotely. This is what makes most time of use plans possible.

• Day/night meter: A set-up that records daytime and night-time usage separately, with hours set by your local network.

• Controlled load: Appliances, usually the hot water cylinder, that can be switched off for short periods to help manage demand.

• Lines company: The local business that owns and runs the poles and wires in your area. Their lines charges are built into your power bill.

Different networks, different rules

New Zealand's electricity network isn't one single system. Power reaches homes through local lines companies, and there are more than two dozen of them, each running the poles, wires and substations in their own area.

Because these networks are run separately, the cost of moving electricity differs from region to region. Some areas have older or more spread-out networks that cost more to maintain, while others are more compact or recently upgraded. Those costs feed into how power is priced locally, including when off-peak periods apply and how much difference they make.

You can see this in the numbers. MBIE's Quarterly Survey of Domestic Electricity Prices for 15 August 2026 put the national average residential price at 42.1c per kWh. Across the towns surveyed, prices ranged from 37.2c in Wellington to 51.0c in Balclutha, and the lines component alone ranged from 11.5c in Nelson to 25.6c in Balclutha.

Two kinds of off-peak plan

Network-based day/night rates. Some off-peak pricing is offered by the network in your area and depends on your meter set-up. Because each network has its own requirements, the hours vary. On Meridian's Freedom plan, day/night rates may be available depending on your network and meter, with night rates applying from 11pm to 7am in most areas. In the Orion network area around Christchurch, households with a D14/N10 meter have night rates from 9pm to 7am.

Retailer time of use plans. Night Saver is a time of use plan offered by Meridian directly. We use the half-hourly data from your smart meter to apply lower rates from 9pm to 7am every night, compared to day rates on the same plan. Because it doesn't rely on what your local network offers, any home with a communicating smart meter can access those hours.

It's a good example of how your meter and network can shape the details, even with the same retailer. If you're not sure what meter you have, our guide to meter types explains the main ones.

Night Saver offers lower rates from 9pm to 7am compared to day rates on the same plan. Any savings depend on your usage and how much of it you shift into those hours. Ts&Cs and eligibility criteria apply.

Do I have to do everything at night?

No. Most households will always use some power at peak times, and that's fine. Time of use plans reward the loads you can move, like the dishwasher, the laundry or an EV. The lights, the kettle and dinner can stay where they are.

Will I automatically pay less?

Not automatically. EECA points out that retailers may set higher peak rates alongside lower off-peak ones, so a household that doesn't shift any usage could end up paying more. It estimates off-peak plans could save households up to $150 a year, depending on how much usage moves.

Is off-peak the same as free power?

No. Off-peak rates are lower, not zero, and your daily fixed charge still applies.

Are weekends off-peak?

On some plans they are. On Night Saver, the lower-rate window is the same every night of the week, weekends included, with the day rate applying from 7am to 9pm.

Does it matter what time I shower?

It can, if you have an electric hot water cylinder. The power is used when the cylinder reheats, which mostly happens during and just after your shower. That means an early morning shower before 7am can fall in the same lower-rate window as a late evening one. Our bathroom guide covers hot water habits in more detail.

Night Saver tends to suit households that:

• Are night owls, shift workers or heavy evening energy users

• Can shift energy-heavy tasks like laundry or dishes to after 9pm

• Charge an EV overnight

• Have a communicating smart meter

It may be less suited if most of your power use happens during the day and can't easily move. The Electricity Authority makes a similar point, noting that households who can't change their habits much may not see as much benefit.

A good place to start is your own usage. MyMeridian shows when your household uses power, which makes it easier to see how much could realistically sit in the 9pm to 7am window.

• Night Saver plan - lower rates from 9pm to 7am every night

• Compare our plans - see Freedom, Night Saver and Bach side by side

• Take Charge - Saving Power In The Laundry

• Take Charge - Saving Power In The Kitchen

• Take Charge - Saving Power In The Bathroom

• Electricity Authority: time of use plans

• EECA: Check you're on the right power plan

This guide is general information only. It isn't electrical, plumbing, fire safety, food safety or financial advice, and nothing in it should be relied on as a guarantee of safety or of any particular saving.

Always follow the manufacturer's instructions and safety warnings for your appliances and devices, and use a registered electrician or licensed plumber for any electrical or plumbing work. If you're unsure whether something is safe to run while you're asleep or away from home, don't.

Energy use and cost figures are indicative estimates based on typical appliances and the national average residential price of 42.1c per kWh (MBIE Quarterly Survey of Domestic Electricity Prices, 15 August 2026). Your actual costs, and any savings, will depend on your plan, rates, network, meter, appliances and how you use them.

Night Saver offers lower rates from 9pm to 7am compared to day rates on the same plan. Anticipated savings are based on those lower rates, and actual savings vary based on usage. Night Saver requires a communicating smart meter. Ts&Cs and eligibility criteria apply to all Meridian plans and offers.

To the extent permitted by law, Meridian Energy isn't liable for any loss, damage or injury arising from reliance on the information in this guide.

Sources

• Electricity Authority, How to get cheaper power bills with a time-of-use plan: typical peak, shoulder and night periods, and why prices differ by time of day. https://www.ea.govt.nz/your-power/ways-to-save-energy/how-to-get-cheaper-power-bills-with-a-time-of-use-plan/ 

• EECA, Check you're on the right power plan: off-peak plans could save up to $150 a year, and not shifting usage could cost more. https://www.eeca.govt.nz/for-homes/save-on-your-energy-bills/check-youre-on-the-right-power-plan/ 

• MBIE, Quarterly Survey of Domestic Electricity Prices, 15 August 2026: national average 42.1c/kWh and regional price and lines component ranges. https://www.mbie.govt.nz/building-and-energy/energy-and-natural-resources/energy-statistics-and-modelling/energy-statistics/energy-prices/electricity-cost-and-price-monitoring 

• Meridian Energy, Night Saver plan: 9pm to 7am lower rates, smart meter requirement, Freedom and Orion day/night hours. https://www.meridianenergy.co.nz/for-home/pricing-rates/night-saver-plan 

• Meridian Energy, Types of meters: day/night and controlled metering explained. https://www.meridianenergy.co.nz/help/electricity-meter/types-of-meters