Costs & savings

Is solar actually worth it in Australia?

For most owner-occupiers with some daytime electricity use, yes — but the number that decides it is how much of your own generation you use rather than export. Here’s the arithmetic, and the situations where the answer is genuinely no.

6 min read · Last verified 2026-08-15

The 30-second take

Solar pays back through self-consumption. Every kilowatt-hour you use yourself is worth your full retail rate; every one you export is worth a few cents.
The calculation is simple: annual saving = (kWh self-consumed × your usage rate) + (kWh exported × your feed-in rate). Payback = installed price ÷ annual saving.
Feed-in tariffs have fallen sharply, so the old “export everything and get paid” model no longer drives the numbers. Shifting load into daylight hours does.
It’s usually not worth it if you’re moving soon, your roof is heavily shaded or needs replacing, or you’re renting without an arrangement with the owner.
A badly installed system fails the maths regardless of how good the numbers looked on paper.

The honest version of the answer

For a homeowner who plans to stay put, has a reasonably unshaded roof and uses at least some electricity during the day, solar in Australia generally pays for itself well inside the warranty period and then keeps paying. That is why more than four million Australian homes have it.

But “is solar worth it” is really a question about your household, not about solar. Two identical systems on two identical roofs can have very different payback periods depending on when the people inside use electricity. So rather than quoting you an average, here is the calculation you can run yourself in about five minutes.

The calculation

Solar saves you money two ways, and they are worth very different amounts.

Self-consumption — solar electricity you use as it is generated. This is worth your full retail usage rate, because it is electricity you no longer buy.
Export — solar electricity you send to the grid. This is worth your feed-in tariff, which is typically a small fraction of your usage rate.

So: annual saving = (kWh self-consumed × usage rate) + (kWh exported × feed-in rate). Then payback in years = installed price ÷ annual saving. The lever that moves the result most is the split between those two lines, and that split is set by your habits, not your hardware.

A worked example, using round numbers purely to show the method rather than to predict your bill: a system that generates 25 kWh on an average day, where the household self-consumes 8 kWh at 33c and exports 17 kWh at 5c, saves about $2.64 plus $0.85 a day — roughly $1,275 a year. Against a $6,000 installed price that is a payback a little under five years. Change the self-consumption to 15 kWh a day and the same system pays back materially faster. Your own rates are on your electricity bill.

What makes the difference between a good and a mediocre outcome

Daytime usage. Working from home, a pool pump, ducted air conditioning, or simply running the dishwasher and washing machine at midday instead of at night.
Your feed-in tariff versus your usage rate. The wider the gap, the more valuable each self-consumed kilowatt-hour is, and the more a battery starts to make sense.
Roof orientation and shade. North-facing is the classic answer, but west-facing panels generate later in the day, which often lines up better with when people are home.
System size relative to your usage. Undersizing to save $1,500 upfront frequently costs more over the life of the system than it saves.
Whether you plan to electrify. An electric vehicle or a heat pump hot water system dramatically increases the value of a solar system, because they can be scheduled to run on your own generation.

“Exported solar earns a few cents. Self-consumed solar saves you your full retail rate. Almost every decision about whether solar is “worth it” comes back to that gap.”

When solar genuinely isn’t worth it

It is worth being straight about the cases where the answer is no, or not yet.

You’re moving within a couple of years. Solar does add appeal at sale, but you are unlikely to recover the full installed cost, and payback assumes you keep the savings.
Your roof needs replacing soon. Do the roof first. Removing and reinstalling an array is an avoidable cost.
Heavy, unavoidable shade. Optimisers and microinverters help, but they don’t manufacture sunlight. A good installer will tell you this rather than sell around it.
You rent. There are paths available, but they need an arrangement with the owner — we cover them in the renters guide.
Your electricity usage is very low. If your bill is small to begin with, the absolute saving is small too, and the payback stretches.

The variable people forget to price

Every payback calculation quietly assumes the system works properly for its full life. That assumption is doing a lot of work. The Clean Energy Regulator inspected 1,278 home battery installations between July 2025 and April 2026 and found more than 60% substandard and 1.2% unsafe — an install-quality problem, not a hardware problem.

A system that underperforms, fails early, or comes with a warranty nobody will honour turns a five-year payback into something much worse. The cheapest quote can sometimes be your most expensive quote, and no spreadsheet catches that in advance.

Run your own numbers first, then get matched with 2-3 quality solar installers who meet the Solar Select standard and have them quote against the size and usage pattern you have worked out.

Sources

Every quantitative claim on this page traces to one of the sources below — government, manufacturer, or independent AU industry reference. Last verified 2026-08-15.

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