NZ power prices in 2027: why next April matters more than usual

In New Zealand the power bill mostly moves once a year, around 1 April, and 2027 will be a bigger April than usual because two changes land at the same time. Some of the 2027 picture is already fixed; the rest depends on rain, gas and politics. Here is what sits behind your bill and what you can do about it before then.

Where each dollar of your bill goes

Lines charges. Your local lines company owns the poles and wires and charges for using them. The Commerce Commission regulates how much revenue most lines companies can earn over five-year periods. Lines charges make up just over a third of a typical bill, according to Consumer NZ, and are expected to add about $5 a month on average through to 2029, varying by region. You cannot shop around for them: they are the same whichever retailer you use.

Transmission. Transpower runs the national grid; its charges are passed through the lines company and your retailer.

Wholesale energy. Generators sell into the wholesale market. New Zealand is mostly hydro, so prices rise in dry years and when gas is short, and fall when the lakes are full. Four big companies both generate and retail most of the power.

Retail. Your retailer’s own costs and margin, plus how it packages everything into a daily charge and unit rates. This is the part competition works on, and the part you choose when you compare.

GST at 15% applies on top.

The rules. The Electricity Authority regulates the market and retailers’ obligations. There is no price cap on retail power in New Zealand.

Dates already on the calendar

• Lines charges keep rising under the current regulatory period, adding about $5 a month on average each year through to 2029.
• 1 April 2027: low user plans end. The low fixed charge regulations, phased out since 2022, finish. Retailers no longer have to offer plans with a capped daily charge. The Electricity Authority wrote to lines companies on 22 September 2026 asking them to avoid sharp increases, but low users should expect higher daily charges.
• 1 April 2027: peak export rebates change. Lines companies have paid rebates for exports at peak times since 1 April 2026; from April 2027 these are set on long-run marginal cost. That should reward batteries and solar exporting in the evening.
• 1 April 2027: back-billing protections. Retailers must contact customers before recovering undercharged amounts above 25% of the average monthly invoice or $50, and show the amount clearly.
• Time-of-use plans stay. Since 1 July 2026 retailers with 5% or more of the market must offer a plan with cheaper off-peak power. That will not change in 2027.

Rain, gas and politics

Retail energy prices from April 2027. Retailers announce them in the weeks before. In April 2026 increases ranged from 4% to 12% depending on plan and region, according to Consumer NZ. Nobody can tell you the 2027 figure yet.

Hydro. Good inflows going into winter 2026 helped. A dry year in 2027 would push wholesale prices up; the government is consulting on a Winter Energy Reliability Obligation to make the biggest generators hold back-up energy for such years.

Gas. Gas reserves are at the lowest level since records began, down 24.6% in a year, according to Gas Industry Co’s reading of MBIE data. The government is progressing an LNG import terminal at Port Taranaki as a backup fuel for power generation in dry years, and a procurement process is under way. How it will be paid for, and how much of that shows up in household power bills, is not decided. For gas customers, the Commerce Commission’s latest gas pipeline decision recovers network costs faster, so gas lines charges are more likely to rise.

Politics. Consumer NZ calls power prices an election issue and has delivered a petition asking for structural change. Policy after the election could affect 2027 and beyond, but nothing has been announced.

Supply emergencies. If an official conservation campaign is ever called, retailers must pay affected customers compensation; the Electricity Authority proposed in September 2026 keeping the minimum at $12 a week per connection. The last such campaign was in 2008.

Fixed term or open term?

Many retailers offer fixed-term plans, typically locking the price for a set period with a break fee if you leave early, and open-term plans that can change with notice. A fixed term ending after April 2027 protects you from that price change, but check the break fee and what the plan rolls onto. If you are a low user, compare fixed-term offers before April, since the end of the low fixed charge rules will change the maths.

Good moments to check your plan

1. In the weeks before 1 April, when retailers notify their new prices. Check the new rates against Billy, Powerswitch or our comparison page.
2. When a fixed term ends. Do not let it roll onto a default rate unchecked.
3. Before winter, when usage and bills peak.
4. When your household changes: heat pump, EV, solar, working from home. Each changes which plan type suits you. Switching takes 3 to 4 days on average, so there is no reason to wait.

Before 1 April 2027

1. Find your plan name, daily charge and last year’s usage on your bill; our bill guide shows where.
2. If you are on a low user plan, compare standard plans now to see what April 2027 means for you.
3. If you have solar or a battery, ask your retailer and lines company how peak export rebates are passed on.
4. Run a comparison on your real usage.
5. Set a free contract alert for February 2027, when the April prices start to appear.