Commercial solar & batteries: the solar often pays — the battery has to earn it.
For most Australian businesses, solar pays back more comfortably than it does on a home — daytime load means you use what you generate, and it can shave expensive demand charges. The battery is a separate decision: it only stacks up with big, shapeable demand spikes or a poor feed-in tariff. Here's the honest maths, and where the oversell hides.
Reviewed by the Mission Green Energy Team · Updated July 2026
Is commercial solar and battery
worth it for your business?
Solar: usually yes, and often more comfortably than on a home. Battery: it depends — it has to clear the demand-charge maths or rescue a poor feed-in tariff, and it frequently doesn't.
Here's the frame that cuts through a commercial solar pitch. Two decisions are being sold as one, and they have very different economics. Solar earns its keep mainly by cutting the power you buy during the day — and most businesses run their heaviest load during the day, so a large share of what the panels make gets used on site rather than exported. That daytime match is why commercial solar payback is often stronger than residential. A battery is a separate, additional purchase that only makes sense when it earns a return the panels alone can't — usually by shaving expensive demand-charge peaks, or by storing surplus solar you'd otherwise export for a few cents.
So the honest verdict is amber, and it splits: for a business with genuine daytime consumption, solar is often a strong, boring, reliable investment. The battery is where the oversell lives — model your own interval data before you let anyone put battery savings in the payback column. If the panels pay on self-consumption alone, good. If a quote only works because of assumed battery savings, that's a flag, not a feature.
Why commercial solar often pays back
faster than residential.
It comes down to load shape. A business that runs machines, fridges, computers or air-conditioning through the day uses power at exactly the hours solar generates — so more of it is self-consumed, and self-consumed solar is worth far more than exported solar.
The single most important number in any solar business case is your self-consumption rate — the share of generation you use on site instead of exporting. energy.gov.au is blunt about why it matters: every kilowatt-hour you self-consume is a kilowatt-hour you don't buy, and self-consuming your solar saves more money than exporting it. Its SunSPOT tool suggests sizing a business system to self-consume around 80% of what it generates, and — where possible — aiming for a payback of roughly five years.
Read those figures as guidance, not a guarantee. energy.gov.au itself notes the real payback depends on many factors — weather, maintenance, and future electricity prices among them. But the structural point holds: a typical home is empty and low-load through the sunny middle of the day and only ramps up at night, when solar has stopped. A typical business is doing the opposite. That alignment between generation and demand is the whole reason commercial solar so often lands on the right side of the maths.
- Size to your daytime load, not your roof. The biggest system isn't the best system — the best system is the one you can self-consume most of.
- Match the profile. A 9-to-5 office, a daytime-shift factory and a 24/7 cold store all have different curves; the right system size differs for each.
- Don't buy for export. If a chunk of your generation would spill to the grid at a low feed-in rate, that generation is nearly wasted — a smaller, better-matched system usually pays faster.
The bill line that changes
the whole battery question.
Many business tariffs include a demand charge — a cost based on your single biggest spike of power draw, not your total usage. It can be a large slice of the bill, and it's the main thing that can make a battery pay.
A demand charge is billed on the highest interval of power you draw during the billing period — typically the peak 15-minute or 30-minute average — rather than the total energy you consume. On most demand-based tariffs it's measured in kVA (kilovolt-amperes), which captures both the real power and the extra the network has to carry when your site's power factor is poor. Retailers are open that on a demand tariff this charge can be a substantial share of a commercial bill.
Why does the grid bill this way? Because networks have to be built to cope with everyone's peak at once, even if your peak lasts only a few minutes on a few days. Two levers reduce it:
- Solar helps automatically if your peak falls in daylight — energy.gov.au notes that if the system is generating at the time of your peak demand, it reduces the peak demand charge. If your spike is a 7am machine start-up or an after-dark load, solar can't touch it.
- A battery can discharge to flatten short, sharp peaks the panels miss — which is precisely where a commercial battery's business case usually lives.
That's the crux: a battery's value here is almost entirely about how spiky, how frequent and how shapeable your demand is. A site with sharp, predictable peaks a battery can reliably clip may find it pays. A site with a flat, steady load, or peaks that already fall in sunny hours, often won't — the battery adds cost without a matching saving. You cannot tell which you are from a brochure. You can only tell from your interval (smart-meter) data, which brings us to the honest method.
STCs, LGCs and the write-off —
what actually applies at commercial scale.
Bigger systems change the incentive mechanics, and the tax treatment isn't the instant win it's sometimes pitched as. Here's how the pieces fit — confirm the current detail at the source, because these numbers move.
STCs — an upfront discount
The Clean Energy Regulator sets the line at 100 kW. At or below it, systems can create small-scale technology certificates (STCs) — an upfront lump sum knocked off your install price, with the deeming period shrinking by one year each January toward the scheme's close at the end of 2030 (five years in 2026), so the STC discount tapers over time.
LGCs — metered revenue
Above 100 kW, systems create large-scale generation certificates (LGCs) instead — one per megawatt-hour actually generated, sold into the market at a variable price over the system's life. It's a revenue stream, not a discount, so it changes the project's cash-flow shape.
Write-off & depreciation
For 2025-26 the ATO's instant asset write-off covers assets under $20,000 for eligible small businesses. Commercial solar usually costs more, so it typically goes into the small business pool — 15% in year one, 30% thereafter. General info, not tax advice.
Why you shouldn't build a business case
on the feed-in tariff.
Feed-in rates are modest for everyone in 2026 and track the wholesale value of power at sunny times. Exported solar is worth a fraction of solar you use on site — which is exactly why sizing to self-consumption beats sizing for export.
Across Australia in 2026, feed-in tariffs generally sit in the low single digits up to around 10 c/kWh, and in most states they're voluntary retailer offers rather than a mandated rate. As one benchmark, IPART's guideline range for NSW in 2026-27 is roughly 3.4 to 6.5 c/kWh — down on the prior year — because feed-in rates track the wholesale price of electricity at the times solar floods the grid, and that value has fallen as more solar has been installed.
The business implication is simple and it doesn't really differ between a household and a company: a kilowatt-hour you export is worth far less than one you use. If you're buying power from the grid at, say, 25–40 c/kWh but exporting at single-digit cents, every unit you self-consume avoids the retail rate, while every unit you export earns the low feed-in rate. That gap is the entire argument for sizing to your daytime load — and, where you have surplus solar that would otherwise spill to the grid cheaply, the narrow case where a battery starts to look interesting: it lets you keep that energy for your evening or overnight load instead of giving it away. Confirm current rates at energy.gov.au and with your retailer, as they change regularly.
Model your own interval data —
before anyone models it for you.
Every honest commercial energy decision starts in the same place: your actual half-hourly usage. It tells you the two things a brochure can't — how well solar will match your load, and whether a battery has real peaks to shave.
Pull your interval data
Request your half-hourly (interval) consumption from your retailer or via your smart meter. This is the raw truth of when you use power — the foundation for every honest number that follows.
Test the solar match
Overlay a solar generation curve on your load. How much of the generation lands during your consumption? That self-consumption share drives the whole solar payback — aim to size for a high match, not a big roof.
Interrogate the demand peaks
Find your demand-charge peaks in the data. Are they sharp and predictable enough for a battery to clip? Do they fall in daylight (solar's job) or after dark (maybe a battery's)? This decides the battery.
The commercial-solar claims
to be sceptical of.
Commercial energy is a big-ticket sale, and the maths is complex enough to hide a lot. These are the moves that quietly inflate a payback — worth knowing before you're across a boardroom table.
Battery savings propping up solar
If the payback only works once battery savings are added, the panels alone may not stack up. Ask to see the solar case standing on its own, then judge the battery separately on demand-charge and export maths.
Optimistic self-consumption
Assume 90%+ self-consumption and any system looks great. The real number comes from your interval data — a quote that can't show where its self-consumption figure came from is showing you a hope, not a plan.
Export income in the returns
Feed-in rates are low and falling. A model that leans on export revenue to hit its payback is leaning on the weakest, most volatile line in the whole business case.
"Instantly tax-deductible"
Most commercial systems exceed the $20,000 instant write-off threshold and are depreciated over years instead. Treat any one-line tax claim as a prompt to call your accountant, not a settled fact.
Oversized for the roof
A bigger system sells better but pays worse if you can't use the output. Sizing to self-consumption — not to fill the roof — is usually the faster payback.
Ignored future price assumptions
Payback models bake in an electricity-price forecast. Ask what rate rise (or fall) the numbers assume — a rosy forecast can flatter a payback that reality won't deliver.
So what should your business
actually do?
Here's the call we'd give a business owner over the desk: get the solar sized to your real daytime load, and decide the battery separately, from data, once you can see whether it has peaks worth shaving.
Do the solar analysis first. For a business with genuine daytime consumption, solar sized to a high self-consumption rate is often a strong, dependable investment — and it stands on its own without any battery. Decide the battery second, and only on evidence. A commercial battery earns its keep when your interval data shows sharp, shapeable demand-charge peaks the panels can't cover, or when you have meaningful surplus solar you'd otherwise export at a poor feed-in rate. If your load is flat, your peaks already fall in daylight, or your demand charges are small, a battery can lengthen payback rather than shorten it — and that's a perfectly honest "not this one, not yet". Whatever you do, insist the numbers start from your own interval data, keep the solar and battery cases separate, and confirm every incentive and tax figure at the source before you commit. If you're weighing a battery that will also be pitched for grid programs, our guide on whether a VPP is worth it covers that trade honestly too.
Commercial solar & batteries:
your questions, answered.
For many businesses, yes — and often more comfortably than for a home. The reason is load shape: most businesses run their heaviest electricity use during the day, which is exactly when solar generates, so a large share of the power gets self-consumed rather than exported. energy.gov.au notes self-consuming solar saves more than exporting it, and its SunSPOT tool suggests sizing a small-business system to self-consume around 80% of what it generates, aiming for a payback of roughly five years where possible. That is guidance, not a promise — real payback depends on your tariff, your daytime load, install cost, weather and future electricity prices, so the honest step is to model your own interval data rather than trust a headline figure.
Feed-in tariffs across Australia are generally modest for everyone in 2026 — commonly in the order of a few cents up to around 10 c/kWh, and voluntary rather than mandated in most states. IPART's benchmark for NSW in 2026-27 is roughly 3.4 to 6.5 c/kWh, down on the year before, because feed-in rates track the wholesale value of electricity at the sunny times solar exports. The practical takeaway for business is the same either way: exported solar is worth far less than solar you use on site, so a commercial system should be sized around your daytime consumption, not around export income. Check current rates at energy.gov.au and your retailer, as they change.
Demand charges are the part of a commercial bill based on your single highest interval of power draw — typically the peak 15 or 30 minute average in the billing period, often measured in kVA — rather than total energy used. On demand-based tariffs this can be a large slice of the bill. A battery can help by discharging to shave those short peaks, so its value depends heavily on how spiky and how shapeable your demand is. A business with sharp, predictable spikes a battery can flatten may find the battery pays; a business with a flat load profile, or peaks solar already covers during daylight, often will not. This is exactly why you model your interval data before buying, not after.
It depends on cost and your circumstances, and this is general information, not tax advice. For 2025-26 the ATO's instant asset write-off lets eligible small businesses with aggregated turnover under $10 million immediately deduct assets costing less than $20,000 each, where the asset is first used or installed ready for use between 1 July 2025 and 30 June 2026. A commercial solar system usually costs more than $20,000, so it typically would not qualify for the instant write-off; assets of $20,000 or more generally go into the small business pool and depreciate at 15% in the first year and 30% each year after. Rules and thresholds change and eligibility is specific — confirm with the ATO and your accountant.
System size decides which certificate scheme applies. The Clean Energy Regulator sets the dividing line at 100 kW: systems at or below 100 kW may create small-scale technology certificates (STCs) as an upfront incentive, while systems above 100 kW create large-scale generation certificates (LGCs) on an ongoing basis, one per megawatt-hour actually generated. STCs are a lump-sum discount off your install; LGCs are a metered revenue stream over the system's life that you sell into the market at a variable price. Neither is automatically better — it changes the cash-flow shape of the project, which matters for how you finance and model it. Confirm current rules at cer.gov.au.
Often the honest answer is: do the solar first, then decide on the battery from real data. Commercial solar frequently pays on daytime self-consumption alone. A battery adds cost and only clears the bar when it earns its keep — usually by shaving expensive demand-charge peaks, or by storing solar you would otherwise export at a poor feed-in tariff for use after dark. If your load is flat, your peaks fall in daylight where solar already helps, or your demand charges are small, a battery can lengthen rather than shorten payback. Model your interval data, be sceptical of any quote that leans on battery savings to make the numbers work, and size the battery to a demonstrated problem, not a sales target.
Where these figures come from.
Payback guidance, tariff, incentive and tax figures on this page are drawn from official primary sources and were current as at 2026. Programs and rates change — confirm at the source before relying on a figure, and treat tax points as general information, not advice.
- energy.gov.au — Solar for businesses (self-consumption target, ~5-year payback guidance, demand charges)
- energy.gov.au — How solar pays for itself and batteries reduce bills (self-consumption vs export)
- energy.gov.au — Solar feed-in tariff (voluntary rates, wholesale-value basis)
- IPART — Solar feed-in tariff benchmark range for NSW 2026-27
- Clean Energy Regulator — 100 kW threshold defining small-scale (STC) vs large-scale (LGC) systems
- Clean Energy Regulator — Large-scale generation certificates (one per MWh generated)
- Clean Energy Regulator — Small-scale technology certificates & the deeming period (reduces one year each January to end-2030)
- ATO — Simpler depreciation & the $20,000 instant asset write-off for 2025-26 (pool rates 15% / 30%)