Green Finance Guide: Funding Your Electrification
All five major NZ banks offer low-interest green home loan top-ups for electrification upgrades. Combined with government grants, you can make the switch sooner - and save thousands.
By Carolyn Cox · Sustainability Expert, 25+ years · Updated August 2026
The upfront cost is the biggest barrier — but it doesn't have to be
The single biggest obstacle to home electrification is the upfront investment. A hot water heat pump, induction cooktop, or solar system all cost more than their fossil-fuel equivalents at the point of purchase - even though they save money over their lifetime.
The good news is that New Zealand banks are actively encouraging Kiwi homeowners to electrify. Green home loan top-ups offer dramatically lower interest rates on home upgrades that reduce your energy costs and carbon footprint. These are structured as mortgage top-ups, and every major bank now has a product.
If you have an existing mortgage, contact your bank as soon as possible to check your options. If you're planning a kitchen renovation, hot water upgrade, solar installation or new EV, a green loan could save you thousands in interest alone.
Compare NZ green home loans
Westpac
Greater Choices Home Loan
0%fixed for 5 years, up to $50,000
- Equity required
- 20% owner-occupier / 30% investor
Eligible upgrades
- Solar panels
- Home batteries
- Insulation
- Heat pumps
- Ventilation
- Double and triple glazing
- Fully electric vehicles
- EV chargers
- Rainwater tanks
- Hot water heat pumps
Must be repaid in full within 5 years, then 5% applies.
No establishment fees. Main income must be credited to Westpac. Must have a Standard Choices Home lending minimum balance of $150,000.
View at WestpacANZ
Good Energy Home Loan
1.00%fixed for 3 years, up to $80,000
- Equity required
- 20% min
- Min top-up
- $3,000
Eligible upgrades
- Solar panels
- Home batteries
- Insulation
- Heat pumps
- Ventilation
- Double and triple glazing
- EV and hybrid vehicles
- EV chargers
- E-bikes
- Rainwater tanks
- Hot water heat pumps
$1B+ lent since 2022. Note: early repayment fee may apply during fixed term.
View at ANZASB
Better Homes Top Up
1.00%fixed for 3 years, up to $80,000
- Equity required
- 20% owner-occupier / 30% investor
Eligible upgrades
- Solar panels
- Home batteries
- Insulation
- Heat pumps
- Wood burners
- Ventilation and extractor fans
- Double and triple glazing
- EV and hybrid vehicles
- EV chargers
- Ground moisture barrier
- Hot water heat pumps
Partners with Cogo for a Better Energy Calculator. Quotes must be <60 days old.
View at ASBBNZ
Better Future Home Loan Top-Up
1.00%fixed for 3 years, up to $80,000
- Equity required
- 20%
- Loan type
- Mortgage top-up
Eligible upgrades
- Solar panels
- Home batteries
- Insulation
- Heat pumps
- Ventilation
- Double and triple glazing
- EV purchase
- EV chargers
- E-bikes
- Rainwater tanks
- Hot water heat pumps
Renamed from Green Home Loan Top-Up in Feb 2026. Includes e-bikes.
View at BNZKiwibank
Sustainable Energy Loan
Std variable+ $2,000 cashback
- Interest rate
- Standard variable home loan rate
- Kiwibank contributes
- Up to $2,000 over 4 years
- Loan term
- 7-10 years
- Min top-up
- $5,000 (for cashback)
Note: Unlike other banks, Kiwibank charges the standard variable rate - not a discounted promotional rate. The incentive is a $2,000 cash contribution paid over 4 years ($800 after year 1, then $400/year for 3 years) on loans over $5,000.
Eligible upgrades (narrower than other banks)
- Solar panels (SEANZ installer)
- Small-scale wind
- Geothermal
- Small-scale hydro
- Home batteries — not eligible
- Insulation — not eligible
- Heat pumps — not eligible
- Double and triple glazing — not eligible
- EV and hybrid vehicles — not eligible
Best for solar & micro-generation only. Other upgrades - consider the big four banks instead.
View at KiwibankWhat pays back fastest?
Prioritise by payback period. Start with the upgrades that return your investment soonest. All figures sourced from EECA.
How much could you save per year?
Estimated annual savings by switching from gas/fossil to electric alternatives
Ranges vary by household size, location, and current energy use. Gas line saving = daily fixed charge eliminated.
Tips to maximise your green loan
Practical advice for the best deal minus the avoid admin hassle.
- Start with your existing bankGreen loan top-ups are easiest when you already have a mortgage with that bank. Your equity is already assessed — the process is faster and simpler.
- Check your equity firstMost green loans require at least 20% equity. Log into your bank app or check your latest mortgage statement. If you're close, a property revaluation may tip you over.
- Bundle your upgradesPlanning insulation, hot water, and solar? Apply for one green loan to cover all three. One application, one approval, one account. Less paperwork, lower total cost.
- Prioritise by payback periodIf budget is tight, start with the fastest-payback items: induction cooktop and insulation first, then hot water heat pump. Save solar and batteries for later.
- Get quotes before applyingBanks want to see what you're spending the loan on. Get written quotes from installers first. This speeds up approval and shows you've done your homework.
- Keep every receiptYou'll need installation documentation for warranties, insurance, and your bank. Some upgrades may also affect your property's capital value — consult your accountant.
- Plan before the emergencyIf your hot water cylinder is over 10 years old, start planning now. Emergency replacements happen under time pressure — and you end up with like-for-like instead of the best option.
- Know what happens after the promoGreen loan promotional rates revert to standard mortgage rates after 3–5 years. Factor this into your repayment plan. Aim to pay down as much as possible during the promo period.
Other ways to fund your switch
Green loans aren't the only option - these Government grants and new schemes can help too.
Warmer Kiwi Homes — Government Grant
EECA grants covering 50–90% of eligible insulation and heating costs for qualifying homeowners. Eligibility is tested against Community Services Card, SuperGold Combo card, or live in an area identified as low-come. Heat pump grants go up to $3,450 at the 90% rate. Apply for the grant first, then use a green loan to fund the co-pay plus anything outside the grant scope (solar, glazing, EVs).
Ratepayer Assistance Scheme (RAS)
Proposed by Rewiring Aotearoa — a long-term, low-interest loan scheme through local councils for electrification upgrades. Unlike bank green loans (3–5 year terms, mortgage required), these are designed to be longer-term with potential deferred payment until point of sale. Check current status — this scheme is not yet be available but is gaining cross party support ahead of the 2026 election.
Electricity Retailer Rebates
Some NZ electricity retailers offer rebates on smart EV chargers, heat pumps, or solar installation. These change frequently and are worth asking about before you buy. Use powerswitch.org.nz to compare retailers and check for current offers.
Local Council Schemes
Some councils offer additional advice and support for energy-efficient home upgrades. Contact your local council's sustainability team to check what's available in your area.
What about renters?
Green home loans are for homeowners with mortgages. But renters have rights too. Since 1 July 2025, all NZ rental properties must meet the Healthy Homes Standards — your landlord must provide adequate fixed heating, insulation, and ventilation.
As a renter, you can save money by switching to a better electricity retailer — it's free and takes 10 minutes. Use powerswitch.org.nz or billy.govt.nz to compare plans.
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