Commercial solar in Australia can provide businesses with a compelling combination of lower grid electricity consumption, greater control over energy costs and progress towards renewable energy objectives. Energy Action helps Australian businesses understand energy consumption, procurement and renewable energy opportunities so they can make informed commercial decisions.
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Commercial solar Australia projects have become an increasingly practical way for businesses to manage electricity expenditure while supporting sustainability objectives. Instead of purchasing all electricity from the grid, a business can generate power from unused roof or site space and consume that electricity directly within its operations.
However, the commercial case for solar depends on more than the price of the panels. Businesses need to understand installation costs, expected generation, daytime consumption, electricity tariffs, incentives and financing before calculating the likely return.
The economics can be attractive. The Clean Energy Regulator reports that commercial solar installations in the small-scale segment typically achieve payback periods of around two to five years. Nevertheless, every site is different, so businesses should build a project-specific business case rather than relying on a generic payback estimate.
There is no single price for commercial solar. System capacity is one of the biggest cost drivers, although larger systems generally become cheaper per kilowatt because installation and project costs are spread across greater capacity.
Solar Choice's February 2026 commercial price index reported the following national averages. Its figures include GST and available federal Renewable Energy Target incentives.
| System size | Average indicative cost |
| 10 kW | $9,990 |
| 30 kW | $27,360 |
| 50 kW | $47,440 |
| 70 kW | $63,860 |
| 100 kW | $80,470 |
These numbers provide a useful benchmark rather than a guaranteed quote. For example, the same 100 kW system averaged about $73,050 in Hobart and $85,970 in Brisbane in the February 2026 dataset.
Several factors determine the final project price.
Roof condition and accessibility can make installation easier or more complex. Likewise, switchboard upgrades, electrical works, engineering requirements and grid connection arrangements may add costs.
Equipment selection also matters. Higher-quality panels and inverters may carry a higher upfront price, although performance, warranty coverage and expected operating life should form part of the financial assessment.
Most importantly, businesses should compare systems on total value rather than simply choosing the cheapest dollar-per-kilowatt quote.
The basic financial proposition is straightforward. When a solar system generates electricity that your business immediately consumes, you avoid buying that electricity from the grid.
Suppose a business would otherwise pay 25 cents per kilowatt-hour for electricity. If its solar system produces one kilowatt-hour that the site consumes immediately, that generation can potentially avoid approximately 25 cents of electricity consumption cost, subject to the structure of the business's tariff and bill.
By contrast, exported electricity may attract a substantially different value. Feed-in tariff arrangements vary between states and electricity retailers.
Therefore, self-consumption is a critical factor in commercial solar returns.
Commercial sites often have an advantage because their electricity consumption coincides with solar generation.
Offices, warehouses, factories, supermarkets, shopping centres, workshops and many other facilities operate primarily during daylight hours. Consequently, they may consume a high proportion of their solar generation as it is produced.
This is one reason the Clean Energy Regulator identifies commercial solar as financially attractive and notes that businesses generally operate during the day.
Payback period measures how long it takes cumulative savings to recover the initial investment.
A simplified calculation is:
Payback period = net project cost divided by annual financial savings
For example, imagine a solar project costs $80,000 after applicable incentives and produces $20,000 in net annual electricity savings.
The simple payback would be approximately four years.
However, a proper commercial assessment should consider more than this calculation. Solar output degradation, maintenance, inverter replacement, tariff changes, financing costs, exported electricity and tax treatment can all influence actual returns.
Recent industry modelling illustrates the range. Solar Choice's 2025 modelling of almost 400 commercial cases estimated typical sub-100 kW payback periods ranging from about 2.3 years in the Northern Territory to five years in Victoria.
The Clean Energy Regulator provides a broader benchmark of approximately two to five years for small commercial solar.
The strongest commercial solar business cases usually combine several favourable conditions.
A site with high daytime electricity consumption can use more generation directly. Meanwhile, high grid electricity costs increase the value of every kilowatt-hour that solar replaces.
Suitable unshaded roof space also supports stronger generation. Additionally, an appropriately sized system avoids excessive exports where export rates are less attractive than the avoided cost of grid electricity.
For this reason, system design should begin with interval electricity consumption data rather than simply asking how many panels will fit on the roof.
Government renewable energy schemes can materially influence project economics.
Under current Clean Energy Regulator rules, eligible solar PV installations with a capacity of no more than 100 kW and annual output of no more than 250 MWh can participate in the Small-scale Renewable Energy Scheme and receive Small-scale Technology Certificates.
STCs are commonly assigned to a registered agent in return for an upfront reduction in the installation cost.
Larger systems have historically operated under different arrangements and may be eligible for Large-scale Generation Certificates.
Importantly, the Australian Government announced proposed changes in August 2026 that are intended to extend SRES eligibility to solar PV systems between 100 kW and 1 MW installed from 1 October 2026, subject to the required regulations being in place. Businesses considering mid-scale projects should therefore check the final eligibility requirements before making investment assumptions.
Solar batteries can increase the amount of generated electricity a business uses itself by storing excess production for later consumption. However, that does not automatically mean batteries improve every project's financial return.
A business operating mainly during daylight hours may already consume most of its solar generation as it occurs. In fact, Clean Energy Regulator analysis notes that storage can be less financially attractive for many daytime commercial users unless there is sufficient value in shifting excess generation.
Nevertheless, batteries may make sense where a business faces high peak demand costs, operates into the evening, values backup capability or can benefit from load shifting.
Therefore, businesses should model solar-only and solar-plus-storage options separately.
Businesses do not necessarily have to purchase a solar system outright.
Under direct ownership, the business funds the installation and receives the resulting electricity savings. This structure can deliver attractive long-term economics where sufficient capital is available.
Alternatively, a solar Power Purchase Agreement can allow a third party to install, own and operate the system while the business buys the generated electricity under agreed contractual terms. This can reduce the need for upfront capital.
However, a PPA is a long-term agreement. Pricing, escalation clauses, contract length, buyout provisions, maintenance responsibilities and termination conditions all need careful assessment.
Before committing capital, businesses should establish a detailed financial baseline.
Start with at least 12 months of electricity consumption and interval data. Then assess when electricity is consumed, current tariffs, demand charges and the site's likely future energy requirements.
Next, model expected solar generation against that consumption profile. The analysis should estimate how much generation will be consumed on-site and how much will be exported.
Finally, compare the project's capital cost with expected annual savings and calculate simple payback, return on investment and, for larger investments, measures such as net present value and internal rate of return.
| Factor | Why it matters |
| Daytime electricity usage | Determines potential solar self-consumption |
| Grid electricity tariff | Influences avoided electricity costs |
| Solar system price | Determines required initial investment |
| System size | Affects generation and capital expenditure |
| Export tariff | Determines value of unused generation |
| Roof orientation and shading | Influences system output |
| Financing | Changes cash flow and total project cost |
| Maintenance | Affects lifetime financial performance |
This approach helps prevent a common mistake: installing the largest possible system instead of the system that delivers the strongest commercial outcome.
Commercial solar in Australia can provide businesses with a compelling combination of lower grid electricity consumption, greater control over energy costs and progress towards renewable energy objectives. Current market benchmarks indicate that many commercial projects can achieve relatively short payback periods, although actual performance depends heavily on site-specific consumption and project economics.
Solar should also form part of a broader energy strategy. Electricity procurement, contract structure, efficiency, demand management and renewable energy options can all affect the value a business ultimately receives from its energy investment.
Energy Action helps Australian businesses understand energy consumption, procurement and renewable energy opportunities so they can make informed commercial decisions. Visit Energy Action to explore how a more coordinated energy strategy could help your organisation control costs and plan its transition to cleaner energy.
Commercial solar costs depend on system capacity, location, equipment and installation requirements. Solar Choice's February 2026 national averages ranged from about $27,360 for a 30 kW installation to $80,470 for 100 kW, including GST and available federal incentives. Businesses should obtain a site-specific assessment because structural, electrical and grid-connection requirements can materially change the final price.
The Clean Energy Regulator states that commercial solar systems in the small-scale segment typically have payback periods of around two to five years. Actual payback depends on installation cost, solar generation, electricity prices and particularly the proportion of solar power consumed on-site.
A 100 kW system can suit businesses with substantial daytime electricity consumption and sufficient suitable installation space. However, businesses should size solar against their consumption profile rather than selecting 100 kW simply because it is a common commercial system size. The Clean Energy Regulator reports that 20 kW, 40 kW and 100 kW have historically been among the most common commercial sizes under the SRES.
No. Many commercial properties consume electricity during the same daylight hours in which their solar system generates power, allowing high self-consumption without batteries. Storage becomes more attractive when a business needs to shift solar generation into evening periods, manage particular demand costs or obtain other operational benefits.
It can be highly attractive for businesses with suitable sites and strong daytime electricity demand. However, the investment should be supported by a detailed business case covering consumption, generation, capital costs, tariffs, exports, incentives and financing. A project-specific analysis provides a much more reliable indication of expected returns than a generic industry payback figure.
