Solar in Invercargill and Southland: Complete Guide for 2026
NZ's most southern region gets the least sun, so we'll be straight: Southland solar pays back slower than the north. Honest Invercargill yield figures, PowerNet's export rules, and who it still makes sense for.
Southland solar: key takeaways
- Southland is NZ's least sunny region: a 6.6kW system generates about 7,500 kWh a year, the lowest of our regions.
- Cool temperatures keep panels efficient, but short winter days mean output drops sharply from May to July.
- At about 41.4c/kWh (cheap power, thanks to Manapouri), a typical system saves roughly $2,170 a year and pays back in 6 to 7 years.
- PowerNet serves Southland and now applies the national 10kW default export limit, though some rural connections may be lower.
- Best for homeowners staying long term who use power during the day; size the system to daytime use rather than maxing out the roof.
Is solar worth it in Southland?
Southland is New Zealand's most southern region and gets the least sun of anywhere we cover, so it is fair to be sceptical about solar down here. We will be straight with you: it pays back slower than the north. Invercargill averages around 1,600 hours of bright sunshine a year, and a well-oriented 6.6kW system generates roughly 7,500 kWh annually, the lowest of our regions. The cool Southland climate does help a little, as panels run more efficiently when they are not baking, but shorter winter days are the bigger story and output drops sharply from May through July. With power prices near 41.4c per kWh (among the cheaper in the country, thanks to Manapouri on the doorstep), a typical system saves around $2,170 a year and pays back in roughly 6 to 7 years. That is a longer wait than sunny Nelson or Marlborough, so solar in Southland suits homeowners who value long-term energy independence and plan to stay put, more than those chasing the fastest return.
Low sun and low power prices are the two things that stretch out the payback here, so the honest advice is to size the system to what you actually use during the day rather than maxing out the roof. Running the hot water, heat pump and laundry at midday is what makes Southland solar work. For a clear look at the assumptions behind every payback number, our full NZ payback breakdown walks through exactly how the maths is put together.
Want a personalised estimate for your Southland home? Answer a few quick questions and compare quotes from up to 3 Solar Scout-vetted installers.
How much solar will you generate in Southland?
With 3.4 peak sun hours per day and a production factor of 0.85relative to the Auckland baseline, here's what a typical roof-mounted system generates in Southland per year.
Savings figures assume a typical 70% self-consumption rate and use the local electricity rate of 41.4c/kWh. Your actual savings depend on roof orientation, shading, and your daily usage pattern.
For the national picture, see how Southland stacks up against the other 15 NZ regions on annual generation per kW installed.
Electricity and buy-back rates
Southland households pay an average of 41.4c per kWh for grid power (MBIE QSDEP, latest survey). Every kilowatt-hour you self-consume from your panels saves you that full retail rate. Excess generation flows back to the grid, and your retailer pays you a buy-back rate. Retailers set those rates nationally rather than by region, so the figures below apply in Southland the same as anywhere else. Each card shows the headline rate and the rate you earn outside the peak windows, because for a household without a battery the second number is the one that does most of the work.
Buy-back conditions
Contact Energy
Contact publishes the Good Charge peak window (7am to 9am and 6pm to 10pm weekdays, for battery-and-solar customers) but not the peak rate: it prices by address, so there is no national figure to print, and your export rate is set when you register your solar. Powerswitch lists Contact's residential buy-back at 8c/kWh, the lowest here. So the 25c peak quoted all over the internet is a national number for a retailer that does not have one.
Buy-back conditions
Ecotricity
ecoSOLAR pays 21c/kWh peak and 16c/kWh off-peak on Ecotricity's own page. The peak WINDOW is not published, and neither is the GST basis. The off-peak rate is the strongest here, which matters more than the headline for a household without a battery.
Buy-back conditions
Electric Kiwi
Sources disagree and we will not pick one. Electric Kiwi's own solar page advertises a 23c/kWh buy-back and quotes 11.5c/kWh off-peak (incl GST). Its Powerswitch profile says MoveMaster pays 20c/kWh peak (weekdays 7 to 9am, 5 to 9pm) and 10c/kWh off-peak, and that the Everyday and GO250 plans pay 8c/kWh. Ask for the number in writing before you switch.
Buy-back conditions
Frank Energy
Flat 12.5c/kWh, and Frank's own FAQ says the credit is shown before GST. If you are not GST-registered you are not making a taxable supply, so 12.5c is what lands on the bill: the 15% is added only for GST-registered customers, via a buyer-created tax invoice.
Buy-back conditions
Genesis Energy
Genesis's Powerswitch profile states a flat 12.5c/kWh excluding GST for home and business connections, the same rate as its Frank brand. Paid at one rate all day: no peak window to chase.
Buy-back conditions
Mercury
Two plans. The flat plan pays 11.1c/kWh. The Flex plan is seasonal AND time-of-use: winter (1 May to 30 Sep) 20.38c peak and 15.75c off-peak; summer (1 Oct to 30 Apr, the seven months a roof exports most) 10.44c peak and 9.17c off-peak. Peak is 7 to 11am and 5 to 9.30pm. The 9.17c shown here is the rate that applies for most of the hours a roof actually exports. Rates exclude GST. A further 6.9c/kWh for two years is available if you install through one particular installer: that is an installer arrangement, not a plan rate, and it is deliberately not folded into the rate above.
Buy-back conditions
Meridian Energy
15c/kWh year-round on the open-term Freedom and Night Saver plans, lifting to 24c/kWh in the winter peak windows only (7 to 10am and 5 to 9pm, July to September, weekdays). Exports bill at 15c and the extra 9c arrives as a separate credit; you need a communicating smart meter to get it. Fixed-term plans, including EV, get a flat 12c. Meridian's page says rates do not include GST.
Buy-back conditions
Octopus Energy
The Peaker plan pays 23c/kWh peak and 10c/kWh off-peak (peak: 7 to 11am and 5 to 9pm, weekdays). Octopus says on its own page that you are unlikely to make the most of the peak rate without a battery. The standard OctopusFlexi plan is 19c peak and 14c off-peak. Both are lower on the Northpower and Top Energy networks (Peaker 21c/8c, Flexi 17c/12c), so these are not national numbers. Powerswitch lists Flexi as a flat 17c: the two sources disagree and we have used Octopus's own page.
Self-consumption is the bigger saving: every kWh you use yourself is worth 2 to 3 times more than every kWh you export. For the full national retailer comparison, see our buy-back rates guide.
PowerNet export rules
PowerNet manages the lines network across Southland, including Invercargill, Gore, Winton, Te Anau and the wider Southland District. Like the rest of the country, Southland now sits under the national 10kW default export limit for residential solar that took effect in 2026, up from the old 5kW cap, so most homes can export a larger system without special approval. Parts of the rural network can still be export-constrained, so PowerNet may apply a lower limit at some addresses; your installer confirms the limit for your specific connection before applying. An AS/NZS 4777.2:2020 compliant inverter and a distributed generation application are required, both handled by your installer.
For the full step-by-step from accepting a quote to switch-on, see our NZ solar installation process guide.
Typical system economics
Below is what a typical 6.6kW system looks like in Southland from a financial perspective. Real numbers will vary with installer, brand, and roof complexity. For the full national pricing context, our NZ solar installed-cost guide shows what 6.6kW jobs typically include and how to spot a fair quote.
What you can expect in Southland
System size
6.6kW
Installed cost
$14,800
Annual generation
7,500 kWh
Annual savings
$2,170
Payback period
6.8 yrs
After this point, the power is yours.
Estimates based on the regional production factor, average local electricity rate, and a typical 70% self-consumption profile. Your actual savings will vary with your roof, usage pattern, and retailer.
Sunshine by month in Southland
Solar generation tracks closely with sunshine hours. Here's how Southland's monthly sunshine hours look across the year (NIWA data).
How Southland compares month-to-month
How Southland compares with nearby regions
Here's how Southland's solar numbers stack up against its neighbouring regions, on annual sunshine, typical output from a 6.6kW system, local power price, and payback period.
Choosing the right installer matters more than choosing a panel brand. Workmanship quality, paperwork handling, and how a company services warranty claims drive most of the long-term experience. Our guide to choosing a solar installer in NZ covers SEANZ membership, the questions to ask, and the red flags to avoid.
Solar Scout-vetted solar installers serving Southland
Every installer in the Solar Scout network is independently vetted. We connect you with up to 3 operating in your area so you can compare quotes on price and fit, never an open auction.
- EWRB registration: Licensed to do electrical work in New Zealand
- Positive customer experiences and real references: Read and checked before they can quote you
- SEANZ or Master Electricians: Backed by an industry body
- 5 years of solar: Solar-specific experience, not just general sparky work
Southland solar FAQs
Does solar actually work in Southland?
Yes, but at the lowest yield of any region we cover, so it pays back slower. Invercargill averages around 1,600 hours of bright sunshine a year, and a well-oriented 6.6kW system generates roughly 7,500 kWh annually. The cool climate keeps panels efficient, but short winter days are the limiting factor. Solar still stacks up here, it just needs realistic expectations and a system sized to your daytime use.
How much will a 6.6kW system generate in Invercargill?
Around 7,500 kWh a year for a well-oriented, unshaded array, the lowest of our regions but still enough to cover a good chunk of a typical home's daytime power. Output is strongly seasonal: summer months do most of the work, while June and July can drop to a fraction of the December figure. A north-facing roof with minimal shading matters more here than almost anywhere, so a proper site assessment is worth it.
How long until solar pays for itself in Southland?
A typical 6.6kW system (around $14,800 installed) saves roughly $2,170 a year and pays back in about 6 to 7 years. That is slower than the sunnier north, held back by two things: less sun and Southland's relatively cheap grid power near 41.4c per kWh. Using more of your own solar during the day, rather than exporting it, is the single biggest lever on shortening that payback.
Why is Southland's payback longer than other regions?
Two reasons, and they compound. First, Southland gets the least sun in the country, so each panel generates less. Second, Southland has some of NZ's cheaper electricity thanks to the Manapouri hydro scheme nearby, so every unit of solar you use displaces a cheaper grid unit than it would up north. Cheap power is great for your bill, but it does mean solar takes longer to pay for itself. We would rather tell you that up front.
What are the export rules for PowerNet?
Southland now sits under the national 10kW default export limit for residential solar that came in during 2026, up from the previous 5kW cap. Most Southland homes can export a decent-sized system without special approval. Some rural parts of the PowerNet network can still be export-constrained, so a lower limit may apply at particular addresses. Your installer checks the limit for your exact connection and lodges the distributed generation application before switch-on.
Who does solar in Southland actually make sense for?
Homeowners who plan to stay in their place for the long haul and want protection from future power price rises, more than those chasing the quickest return. If you use a fair bit of power during daylight hours (people working from home, heat pumps running, hot water on a timer), the numbers improve noticeably. If your home sits empty all day and fills up at night, the case is weaker, and we will tell you so.
Is the cold or frost a problem for the panels?
Not at all. Panels are sealed and rated well beyond anything a Southland winter throws at them, and the cold actually improves their efficiency. Frost and light snow clear off pitched panels quickly. What matters is a quality install: proper flashing, sealing and wind-rated mounting for Southland's exposed, gusty sites, which is exactly what Solar Scout vetting checks for.
How long does a solar install take in Southland?
Usually 4 to 8 weeks from accepting a quote to switch-on, with 1 to 2 days of on-roof work. Allow a little extra for Fiordland, the Catlins and remote Southland District addresses, where travel and scheduling can add time. Your installer handles the PowerNet connection approval and any meter change as part of the job.
How much does solar cost in Invercargill?
A typical 6.6kW system in Southland costs around $14,800 fully installed, covering panels, inverter, mounting, wiring and the connection paperwork. That sits above the national midpoint for three reasons: freight and travel to the bottom of the South Island, a smaller local installer pool, and the wind-rated mounting Southland's exposed sites call for. Fiordland, the Catlins and remote Southland District addresses can carry a travel surcharge on top. At around 41.4c per kWh for grid power, that system saves roughly $2,170 a year and pays back in about 6 to 7 years. Get three quotes and confirm exactly what each includes, especially the site assessment and the PowerNet distributed generation application.
How bad is Southland solar in the middle of winter?
Honestly, it is the weakest stretch of any region we cover. Invercargill averages about 73 hours of bright sunshine in June against about 189 in January, so midwinter delivers well under half the sunshine of midsummer, and that is exactly when a Southland home wants the most power. Annual output from a 6.6kW system is around 7,500 kWh, but very little of it lands in June and July. Plan around it: solar in Southland cuts the summer and shoulder-season bills hard and barely touches the deepest winter ones. Sizing the array to cover a June power bill would leave you with a large, expensive system idling for the rest of the year.
How do I apply for solar approval with PowerNet in Southland?
Your installer lodges the distributed generation application with PowerNet before switch-on, and confirms the export limit that applies at your exact connection as part of it. That check matters more here than in most regions: Southland sits under the national 10kW default export limit, but parts of the rural PowerNet network can still be export-constrained, so a lower limit may apply at some addresses. The application needs your address and ICP number (printed on your power bill), the system size and an AS/NZS 4777.2:2020 compliant inverter model. Allow 4 to 8 weeks from accepting a quote to switch-on, with 1 to 2 days on the roof, and a little extra for Fiordland, the Catlins and remote Southland District addresses.
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