Solar in 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.
Peak Sun
Hours
3.4
hrs/day
Avg Power
Rate
28.0
c/kWh
Annual
Sunshine
1,600
hrs/year
Grid Connection
PowerNet
Residential export capped at 10 kW without pre-approval
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 28c/kWh (cheap power, thanks to Manapouri), a typical system saves roughly $1,470 a year and pays back in 9 to 10 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 28c per kWh (among the cheaper in the country, thanks to Manapouri on the doorstep), a typical system saves around $1,470 a year and pays back in roughly 9 to 10 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.
power bill?
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 28.0c/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 28.0c 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. The top retailers serving the region:
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
System size
6.6kW
Installed cost
$14,800
Annual generation
7,500 kWh
Annual savings
$1,470
Payback
10.1 yrs
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
Total: 1,600 sunshine hours per year. Range: 73 (winter low) to 189 (summer peak) hours. Source: NIWA.
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.
- SEANZ Member: Sustainable Energy Association of New Zealand
- EWRB Registered: Licensed electrical workers, audited annually
- Master Electricians: National accreditation body for installation quality
- Fully Insured: Public liability cover for every job
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 $1,470 a year and pays back in about 9 to 10 years. That is slower than the sunnier north, held back by two things: less sun and Southland's relatively cheap grid power near 28c 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.
Written by Ben Wallis
Ben has worked as a licenced electrician in New Zealand for over six years, from residential rooftop systems to large industrial projects. He writes Solar Scout's guides based on real experience in the field, so Kiwi homeowners hear what installers actually think, not what salespeople say.
Nearby regions
Solar in Queenstown
Alpine clarity, high-value homes, and Aurora Energy's 10kW export limit. Honest Queenstown-Lakes yield figures, what mountain shading does to output, and what it costs up here.
Solar in Otago
Aurora's 10kW export limit (lifted from 5kW in 2025), Central Otago's clear-sky bonus, and the lowest electricity rates of our 8 regions.
Solar in Canterbury
Orion's 5kW export limit, NZ's most advanced smart meter rollout, and clear Canterbury skies. What Christchurch homeowners need to know.