Solar in Northland: power prices, export limits & batteries

Northland is one of New Zealand’s most interesting regions for residential solar. The region has a strong solar resource, comparatively high household electricity costs in parts of the network, growing battery uptake, and both Northpower and Top Energy now support residential export limits of up to 10kW subject to their connection requirements.

The important point is that solar economics are property-specific. Roof orientation, shading, electricity use, retailer plan, battery storage, EV charging, hot-water loads and network settings can all change the result. Revolve Electrical designs around the actual property rather than starting with a standard panel package.

Northland solar at a glance

• About 2,000 hours of bright sunshine a year: Earth Sciences New Zealand / NIWA says most parts of Northland receive around 2,000 hours annually, with some areas exceeding 2,100 hours.
• Northpower residential export: Northpower states a 10kW export limit per residential connection. It also says it is not currently aware of specific low-voltage congestion locations for small-scale generation exporting up to 10kW.
• Top Energy residential export: from 1 April 2026, eligible single-phase domestic connections can export up to 10kW, subject to Top Energy’s technical requirements and network assessment.
• Battery uptake is already significant in the Far North: Top Energy says around 60% of new solar connections on its network since 2020 have included batteries.
• Coastal conditions matter: salt exposure, wind and the installation environment should be considered when selecting mounting hardware, fasteners, conduit and equipment locations.

Why power prices matter for solar

Every kilowatt-hour of solar electricity used directly in your home is a kilowatt-hour you do not need to buy from your electricity retailer. That means the value of self-consumed solar is linked to the retail electricity price you would otherwise have paid.

MBIE’s Quarterly Survey of Domestic Electricity Prices (QSDEP) tracks publicly advertised residential tariffs for modelled households around New Zealand. The survey is updated quarterly and includes locations in both the Northpower and Top Energy areas. Because tariffs change, we use current retailer and network information when modelling a project rather than relying on a permanent headline cents-per-kWh figure.

Practical takeaway: a higher retail electricity price can improve the value of using your own solar directly, but your actual bill structure, fixed charges, time-of-use pricing and retailer plan all need to be considered.

Self-consumption is usually more important than chasing the highest buy-back rate

Solar normally delivers the most value when the electricity is used on site while it is being generated. A household that can shift more consumption into daylight hours may use a larger share of its own solar generation.

Loads that can sometimes be aligned with solar production include:

• hot-water heating
• EV charging
• pool or spa equipment
• heat pumps
• washing machines and dishwashers
• workshops, pumps and other daytime equipment

Surplus solar can be exported to the grid under your retailer’s buy-back terms, but export rates vary between retailers and may also vary by time of day. That is why we model both self-consumption and export rather than basing a design on the headline buy-back rate alone.

Northpower solar export rules

Northpower currently states a 10kW export limit per residential connection. For multi-phase connections, the permitted export may be divided across phases. Northpower also requires distributed-generation applications so it can assess safety, network capacity and potential effects on other customers.

Northpower says there are currently no specific locations on its low-voltage network where it is aware of export congestion for small-scale generation exporting up to 10kW. Individual applications still need to meet Northpower’s technical requirements and approval conditions.

Top Energy solar export rules

Top Energy increased its standard export limit from 5kW to up to 10kW from 1 April 2026 for eligible single-phase domestic connections.

Top Energy states that eligible systems must meet its technical requirements, including compliant inverter functions and applicable electrical regulations. The actual export approved for a particular property can still depend on a network assessment.

This is particularly relevant for Far North homes where customers may be considering larger solar arrays, battery storage, EV charging or future electrification.

Batteries in Northland

Battery storage is becoming a meaningful part of the Northland solar market. Top Energy reported that around 60% of new solar connections on its network since 2020 have included batteries.

A battery can:

• store excess daytime solar for use later
• increase household solar self-consumption
• reduce evening grid imports
• support backup power when the system is specifically designed for backup
• help manage export limits in some system designs

A battery is not automatically the best financial choice for every property. Capacity, usable energy, backup requirements, inverter architecture, tariff structure and household load profile all matter.

AC-coupled versus DC-coupled solar in Northland

Revolve Electrical works with both AC and DC/hybrid solar architectures.

Enphase AC microinverters

Enphase uses a microinverter at each panel. This can suit roofs with multiple orientations, complex layouts or panel-level monitoring requirements. Each panel operates independently through its own microinverter.

Sigenergy DC-coupled hybrid systems

Sigenergy is a hybrid platform designed to integrate solar generation, inverter functions, battery storage, monitoring and energy management. It can be particularly useful where battery integration, backup, future expansion or whole-system energy management are priorities.

Neither architecture is automatically better. The right approach depends on the property, roof, load profile, storage requirements and future plans.

Coastal Northland solar installations

Northland has a large number of coastal properties, from Whangārei Heads and Tutukaka through to the Bay of Islands and Far North. Salt-laden air and exposed conditions can accelerate corrosion if equipment and installation methods are poorly selected.

For coastal sites we consider:

• mounting-system material and corrosion resistance
• appropriate stainless fasteners and compatible metals
• UV and environmental exposure of conduit and cabling
• equipment positioning
• roof condition and roof material
• wind exposure
• manufacturer installation requirements and warranty conditions

How much solar will my Northland home generate?

There is no reliable single generation number that applies to every Northland roof. Annual output depends on array size, panel orientation, roof pitch, shading, equipment efficiency and local conditions.

That is why Revolve uses Aurora solar design software to model the actual property. We build a digital roof model, assess usable roof areas and solar exposure, test panel layouts and estimate expected production before recommending a system.

What about export hours and peak buy-back rates?

Some electricity retailers offer time-dependent solar export pricing, while others use a flat buy-back rate. The periods that pay the highest export rate may be outside the hours when an un-batteried solar system produces most of its surplus energy.

This is one reason batteries and load shifting can change the economics. Rather than selecting a system around one advertised export rate, we recommend checking the retailer’s current terms and modelling how much energy is likely to be:

• used directly during the day
• stored in a battery
• exported during standard periods
• exported during any higher-value periods

Is solar worth it in Northland?

For many Northland properties, solar can significantly reduce grid electricity purchases. But a useful answer needs more than a regional average or generic payback number.

We look at:

• your recent electricity usage
• when you use electricity
• roof layout and shading
• Northpower or Top Energy connection requirements
• future EV charging
• hot-water loads
• battery and backup goals
• current retailer pricing and export terms
• equipment and installation cost

From there we can compare solar-only and solar-plus-battery options using realistic assumptions for your property.

Start with your actual property

Send us your property address, recent electricity bills or usage data, and tell us what you want the system to achieve. Revolve can then prepare a property-specific solar design and assess suitable AC or DC/hybrid system options.

Start the Revolve 5-Minute Solar Assessment →

Sources and update notes

This guide uses information from Earth Sciences New Zealand / NIWA, Northpower, Top Energy and MBIE. Network rules, retailer pricing and export terms can change, so current requirements are confirmed during the design and connection process.