Can Enough Solar Power Be Generated To Power A Home?

Yes, it is possible to generate enough solar power to power a home in New Zealand. The amount of solar power that can be generated depends on several factors such as the size and orientation of the solar panels, the efficiency of the panels, the local weather conditions, and the electricity consumption of the home.

New Zealand has excess amounts of sunlight, more than enough to power the entire country with solar energy. NIWA scientists provide ample evidence to support this claim, stating that "The solar energy arriving at the roofs of New Zealand homes over the course of a year is twice the country's total annual energy consumption, or 16 times the energy used in those homes."

The Different Regions of New Zealand And Potential Solar Power Production

In New Zealand, electricity production via solar power systems varies from region to region. This can be dependent on:

• Latitude and locations located closer to the equator will generate more solar power

• The amount of cloud cover a region/area experiences

NIWA has taken multiple years of weather data and estimated the solar energy we have available around New Zealand. NIWA's solar radiation map (seen below) displays areas that experience the greatest amount of sunlight in a given day. Locations with a higher proportion of clear-sky days such as Nelson, Blenheim, Manawatu, Bay of Plenty, and Hawke's Bay, correspond with higher solar irradiance.

Resource from NIWA Science

New Zealand's Potential Solar Compared To The Rest Of The World

There's no doubt about it, all areas of New Zealand are worthy of having a solar power system installed. Sure, Invercargill receives lower amounts of solar radiation in comparison to other parts of New Zealand, however, Invercargill gets more sun than Germany, which has one of the highest rates of solar power per capita in the world.

Annual Solar Generation for Different Sized Systems (Chart For Main Regions)

This chart indicates the approximate annual energy production of different size systems, ranging from a 3kW system to an 10kW; in Auckland, Wellington, Christchurch and Dunedin.  This data is collected from SMA's Sunny Design Web. Assuming the systems are installed on a 20° roof facing north.

Last updated: March 2025