Solar on the West Coast: Complete Guide for 2026
New Zealand's wettest region, but solar still pays. Honest yield figures, Westpower and Buller Electricity's 10kW export limits, and what Coasters need to know before going solar.
Peak Sun
Hours
3.8
hrs/day
Avg Power
Rate
31.6
c/kWh
Annual
Sunshine
1,900
hrs/year
Grid Connection
Westpower / Buller Electricity
Residential export capped at 10 kW without pre-approval
West Coast solar: key takeaways
- The West Coast is New Zealand's wettest region, so solar yields less: about 8,480 kWh a year from a 6.6kW system, similar to Otago.
- Cool coastal temperatures keep panels efficient, and they still generate on the region's many bright overcast days.
- At about 31.6c/kWh for grid power, a typical system saves roughly $1,875 a year and pays back in 7 to 8 years.
- Two networks serve the Coast: Westpower (Greymouth, Hokitika, south) and Buller Electricity (Westport, north), both allowing up to 10kW export.
- Best for homeowners who value energy independence: specify wind-rated, marine-grade mounting for the exposed, high-rainfall climate.
Is solar worth it in West Coast?
The West Coast is New Zealand's wettest region, so it is fair to ask whether solar makes sense here. It does, just at a more modest yield than the sunny top of the South. Hokitika averages around 1,900 hours of bright sunshine a year, similar to Otago, and a well-oriented 6.6kW system generates around 8,480 kWh annually. The Coast's cool temperatures actually help: panels run more efficiently when they are not baking, and they keep producing on the region's many bright, overcast days. With power prices near 31.6c per kWh, a typical system saves roughly $1,875 a year and pays back in around 7 to 8 years. Both West Coast networks now allow up to 10kW of solar export, so system size is rarely the limiting factor.
The Coast is served by two lines companies rather than one, so the first step is knowing which network your address sits on: Westpower covers Greymouth, Hokitika, Reefton and the south, while Buller Electricity covers Westport and the northern coast. Both are coastal and high-rainfall, so quality flashing, sealing and wind-rated, marine-grade mounting matter more here than almost anywhere in the country. For an honest look at how a lower-sun region like the West Coast still pays back, our full NZ payback breakdown walks through the assumptions behind the numbers.
Want a personalised estimate for your West Coast 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 West Coast?
With 3.8 peak sun hours per day and a production factor of 0.97relative to the Auckland baseline, here's what a typical roof-mounted system generates in West Coast per year.
Savings figures assume a typical 70% self-consumption rate and use the local electricity rate of 31.6c/kWh. Your actual savings depend on roof orientation, shading, and your daily usage pattern.
For the national picture, see how West Coast stacks up against the other 15 NZ regions on annual generation per kW installed.
Electricity and buy-back rates
West Coast households pay an average of 31.6c 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.
Westpower / Buller Electricity export rules
The West Coast is served by two lines companies. Westpower covers the Grey and Westland districts and the southern Buller area, including Greymouth, Hokitika, Reefton, Ross and the glacier towns. Buller Electricity covers the northern coast around Westport, from Punakaiki to Karamea. Both have adopted the national 10kW default export limit for residential solar (they were early adopters, already at 10kW ahead of the May 2026 deadline), and Buller Electricity reports no network congestion, so export is generally unconstrained. Both require an AS/NZS 4777.2:2020 compliant inverter and written approval before connection; your installer handles the distributed generation application. Check which network your address sits on, as the application form and contact differ between the two.
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 West Coast 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
$14,500
Annual generation
8,480 kWh
Annual savings
$1,875
Payback
7.7 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 West Coast
Solar generation tracks closely with sunshine hours. Here's how West Coast's monthly sunshine hours look across the year (NIWA data).
How West Coast compares month-to-month
Total: 1,900 sunshine hours per year. Range: 107 (winter low) to 212 (summer peak) hours. Source: NIWA.
How West Coast compares with nearby regions
Here's how West Coast'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 West Coast
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
West Coast solar FAQs
Does solar actually work on the West Coast with all the rain?
Yes, just at a more modest yield than the sunny top of the South. The Coast is NZ's wettest region, but Hokitika still averages around 1,900 hours of bright sunshine a year, similar to Otago. A well-oriented 6.6kW system generates around 8,480 kWh annually. The cool climate helps: panels lose efficiency when they overheat, so the Coast's mild temperatures keep them near their rated output, and they keep producing on bright overcast days.
How much will a 6.6kW system generate on the West Coast?
Around 8,480 kWh a year for a well-oriented array, comparable to Otago and a little below Christchurch. Output is strongest over the drier summer months and dips through the wetter, shorter winter days. Choosing a north-facing roof plane with minimal shading matters more here than in sunnier regions, so a proper site assessment is worth it.
How much does solar cost in Greymouth or Hokitika?
A 6.6kW system on the West Coast typically costs $14,000 to $15,500 installed, at or slightly above the national midpoint. The premium reflects the region's remoteness, higher freight and travel costs, a smaller local installer pool, and the wind-rated, marine-grade mounting the coastal climate calls for. South Westland addresses (Franz Josef, Fox Glacier) and Reefton may add a travel surcharge. Get three quotes and confirm what is included.
What are the export limits for Westpower and Buller Electricity?
Both West Coast networks apply a 10kW default export limit for residential solar. They were early adopters of the national standard, already at 10kW ahead of the May 2026 deadline, and Buller Electricity reports no network congestion, so export is generally unconstrained. That means system size is rarely the limiting factor on the Coast; your roof and budget usually decide it.
How long until solar pays for itself on the West Coast?
A typical 6.6kW system (around $14,500 installed) saves roughly $1,875 a year and pays back in about 7 to 8 years. That is slower than sunny Nelson or Marlborough, but still a solid return, helped by the Coast's power prices near 31.6c per kWh. Using more of your own solar during the day (running the hot water, heat pump or laundry at midday) shortens the payback.
Which network am I on, Westpower or Buller Electricity?
Westpower covers the Grey and Westland districts and the southern Buller area: Greymouth, Hokitika, Reefton, Runanga, Ross and the glacier towns. Buller Electricity covers the northern coast around Westport, from Punakaiki up to Karamea. It matters because the two have separate application forms and contacts. Your installer will confirm which network your address sits on before applying.
Is the high rainfall and wind a problem for the panels?
Not for the panels themselves, which are sealed and rated for heavy rain. What matters is the install quality: the Coast's high rainfall and exposed, windy sites make proper roof flashing, sealing and wind-rated mounting essential, and salt air near the coast means marine-grade fixings. A good installer designs for the Coast's conditions as standard, which is exactly what Solar Scout vetting checks for.
How long does a solar install take on the West Coast?
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 South Westland addresses (Franz Josef, Fox Glacier) and Reefton, where travel and scheduling can add time. Your installer handles the Westpower or Buller Electricity connection approval and any meter change.
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.
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