How Does Solar Finance Work in Australia?
Solar finance in Australia means spreading the cost of a system over time — through a bank green loan, an installer's own interest-free payment plan, or a government-backed low-interest loan — rather than paying upfront. Unlike some markets, Australian solar prices are almost always quoted after the federal STC rebate is already applied, so the amount you actually need to finance is smaller than the sticker price on the equipment alone.
This guide covers the main ways to finance solar in Australia, how the STC rebate fits into that number before you even start comparing loans, and what to check on the fine print before you sign — alongside our guide to what a system costs installed, since your finance amount starts there.
Ways to finance solar in Australia
Solar finance in Australia generally falls into three categories: a bank-arranged green loan, an installer's own in-house payment plan, or a government-backed low-interest loan. Each spreads the cost over months or years instead of a single upfront payment, but they work differently and carry different terms.
- Bank green or eco loans — a personal loan product, often at a reduced interest rate for solar and other energy-efficiency purchases, arranged directly through your bank and secured against your own credit, not the system.
- Installer/retailer in-house finance — a payment plan arranged by the solar company itself, sometimes marketed as "interest-free" for a set term.
- Government-backed low-interest loans — discounted-rate finance delivered through participating lenders for eligible home upgrades including solar and batteries (see below).
- Standard personal loan — an ordinary unsecured loan with no solar-specific discount, used when a dedicated product isn't available or doesn't suit.
Which one makes sense depends on the interest rate on offer, the term length, and whether the amount you actually need to borrow already reflects the federal STC rebate — see the next section for why that matters before you compare offers.
Why the STC rebate matters before you finance
In Australia, the federal Small-scale Technology Certificate (STC) rebate is applied by your installer as an upfront, point-of-sale discount — so the number you're financing should already be the after-rebate price, not the equipment's full retail cost. A typical fully-installed 6.6kW system, after the STC discount, runs $5,000–$8,500 depending on tier and location (see our installation cost guide for the full city-by-city breakdown) — that after-rebate figure is what you should be financing, not a pre-rebate quote.
This is the main structural difference from markets with no equivalent national rebate: in Australia, the STC discount only applies to Clean Energy Council-approved equipment installed by a CEC-accredited installer, so an uncertified install forfeits it — and if that happens, the amount you'd need to finance jumps by the value of the lost rebate. Always confirm the finance amount on any loan or payment plan is calculated against the after-rebate price, not the pre-rebate one; see our full solar rebate guide for how the STC scheme works.
Green loans, installer plans & the CEFC-backed scheme
Several Australian banks offer green or eco personal loans at discounted interest rates for solar and battery purchases, generally as an unsecured lending product assessed against your own credit and income rather than the system as an asset. Rates and eligibility differ by lender, so it's worth checking your own bank's green loan product against a general personal loan before assuming it's the cheaper option.
Many installers also offer their own interest-free or low-interest in-house payment plans, letting you spread the cost over a fixed term without going through a bank. Ask specifically whether it's truly 0% for the full term, whether there's an establishment or account fee, and what happens if you want to pay it off early.
Australia also has a federal government-backed low-interest loan scheme, delivered through the Clean Energy Finance Corporation (CEFC) via participating lenders, for eligible household energy upgrades including solar and batteries. Because participating lenders, loan caps, and eligibility criteria are reviewed periodically, we're deliberately not quoting a specific figure here that could be out of date — check the CEFC or your own bank for what's currently on offer and whether your address and installer qualify.
Loan repayments vs your payback period
The test that matters for solar finance in Australia is simple: is the loan or plan repayment lower than what the system is actually saving you on your power bill? If it is, the system can be close to cash-flow positive from early on — you're effectively redirecting money you were already paying your retailer toward paying off the system instead.
A panels-only 6.6kW system typically pays for itself in around 3–6 years in Australia — among the fastest payback periods worldwide, thanks to the STC rebate lowering the upfront price and Australia's comparatively high retail electricity rates (see our is solar worth it guide for the full savings walkthrough). A shorter finance term that roughly matches or beats that payback window keeps the loan and the savings working in the same direction; a much longer term can mean you're still repaying well after the system has already paid for itself.
A longer loan term lowers the monthly repayment but usually increases the total interest paid over the life of the loan, so a lower monthly number isn't automatically the better deal — check the total amount repayable, not just the repayment size, before comparing offers. Adding a battery extends the numbers further; see our battery installation guide for how battery finance and payback compare with a panels-only system.
What to check before signing solar finance
In short: confirm the finance amount is after-rebate, confirm the rate is 0% for the full term (not just an introductory period), and compare the total amount repayable — not just the headline monthly figure — before signing.
- Is the finance amount calculated after the STC rebate, not against the pre-rebate equipment price?
- Is it genuinely 0% for the full term, or does the rate step up after an introductory period? Get this in writing.
- Are there establishment, account, or early-repayment fees that offset an advertised 0% rate?
- Is the loan secured or unsecured, and what happens to your obligation if you sell the house before the term ends?
- What's the total amount repayable, not just the advertised interest rate or monthly figure — ask for this number directly from any lender or installer before signing.
Because finance terms change and vary by lender, get current numbers directly from your bank, installer, or the CEFC rather than relying on a fixed figure from any article, including this one. Moneysmart, the Australian Government's independent financial guidance service run by ASIC, has free tools for comparing loan interest rates and total borrowing cost across lenders — a useful independent check before committing to whichever finance an installer first offers.
Common questions
Can you finance a solar system in Australia?
Yes — through a bank green or eco loan, an installer's own interest-free payment plan, a federal government-backed low-interest loan delivered via the Clean Energy Finance Corporation, or a standard personal loan.
Does the STC rebate apply if I finance my solar system?
Yes, and it should be applied before you finance — the STC discount is deducted from the equipment price by your installer at quote time, so the amount you finance should already be the after-rebate price, not the full retail cost.
Is there interest-free solar finance in Australia?
Many installers offer their own interest-free in-house payment plans, and some banks offer reduced-rate green loans. Confirm in writing whether the rate is 0% for the full term or only an introductory period.
What is the CEFC solar loan scheme?
The Clean Energy Finance Corporation (CEFC) backs a federal low-interest loan scheme for eligible household energy upgrades, including solar and batteries, delivered through participating lenders. Loan caps and eligible lenders are reviewed periodically, so check the CEFC directly for current terms.
Is a longer loan term always cheaper for solar finance?
No. A longer term lowers the monthly repayment but usually increases the total interest paid over the life of the loan — compare the total amount repayable, not just the monthly figure, before choosing a term.