Australia is one of the best places on the planet to run a business on solar power. We have among the highest solar irradiance levels in the world, commercial electricity prices that have climbed sharply over the past decade, and a federal incentive framework that meaningfully offsets upfront costs. For businesses that operate primarily during daylight hours, the economics have rarely been stronger.
This guide covers everything you need to know about commercial solar in 2026: which system type suits your operation, how to size it correctly, what government incentives are available, how to pay for it, and what to look for in an installer. If you are still weighing up whether the investment stacks up, our article on commercial solar benefits and ROI for Australian businesses covers the long-term numbers in detail.
What Type of Commercial Solar System Do You Need?
Rooftop Solar
Rooftop solar is the most common choice for Australian businesses. Panels are installed directly on your existing roof structure, converting unused space into a power-generating asset. It suits most offices, retail stores, warehouses, factories, and hospitality venues with adequate roof area and structural integrity.
The main advantage is cost-effectiveness. You are using infrastructure you already own, with no additional land required, and rooftop systems tend to have lower installation costs per kilowatt than ground-mounted alternatives.
Ground-Mounted Solar
Where rooftop space is insufficient or structurally unsuitable, ground-mounted systems offer a practical alternative. Panels are installed on frames anchored to the ground, typically on unused land adjacent to the building.
Ground-mounted arrays can be angled and oriented precisely for maximum sun exposure and are generally easier to access for cleaning and maintenance. They are well-suited to agribusinesses, rural operations, large industrial sites, and any business with available land but an older or complex roofline.
Agricultural Solar
Agricultural solar is tailored to farms and rural operations with high daytime energy use. Irrigation pumps, grain augers, cool rooms, and livestock ventilation systems are ideal loads to offset with solar generation. Because these loads often run during peak sunlight hours, self-consumption rates are high and payback periods can be shorter than in other sectors.
Getting the System Size Right
Sizing is one of the most consequential decisions in a commercial solar project. An undersized system leaves money on the table; an oversized system may create export issues depending on your network distributor’s rules.
A professional installer will assess the right size by analysing at least 12 months of electricity bills, ideally with half-hourly interval data showing when your business consumes power. They will also factor in your future energy plans including EV charging or production expansion, available roof or ground space and its structural limitations, and your network distributor’s export limits, which vary considerably by state and connection type.
As a general guide, small to medium businesses such as cafes, boutique retail, and professional offices often suit systems in the 10kW to 30kW range. Retail centres, industrial workshops, and mid-sized manufacturers typically look at 30kW to 100kW. Large warehouses, factories, hotels, and commercial buildings regularly install systems above 100kW, which also changes the government incentive structure that applies.
Government Rebates and Incentives in 2026
Small-Scale Technology Certificates (STCs) — Systems Under 100kW
The federal government’s Small-scale Renewable Energy Scheme (SRES) provides an upfront discount on eligible solar installations through Small-scale Technology Certificates. When your installer registers the system, STCs are created based on your system’s size, geographic location, and the remaining deeming period under the scheme.
As of 1 January 2026, the deeming period has reduced to 5 years, down from 6 years in 2025, meaning the number of STCs generated per kilowatt installed is lower than in previous years. The STC clearing house caps the price at $40 per certificate excluding GST, with the market trading in the $38 to $40 range. The rebate is applied as an upfront discount on your installer’s quote, so there is no waiting for a government payment.
The SRES phases out by 2030, with the deeming period reducing by one year every January. Acting sooner locks in more certificates per kilowatt installed. As a worked example, a 30kW system installed in Zone 2 (Brisbane or Perth) in 2026 would generate approximately 230 STCs, worth around $9,200 at $40 each. Your installer will calculate the exact figure for your postcode and system size.
Large-Scale Generation Certificates (LGCs) — Systems Over 100kW
Businesses installing systems of 100kW or more are not eligible for STCs. Instead, they access the Large-scale Renewable Energy Target through Large-scale Generation Certificates. Unlike STCs, LGCs are not an upfront discount. They are generated monthly based on the actual renewable electricity your system produces, with one LGC issued per megawatt-hour of eligible generation.
These certificates can be sold to electricity retailers, who have legal obligations to purchase and surrender them, or traded on the secondary market. For larger commercial systems, LGCs provide an ongoing revenue stream that materially improves the return on investment over the life of the system. The Large-scale Renewable Energy Target runs until 31 December 2030, after which the new Renewable Energy Guarantee of Origin (REGO) scheme provides a pathway for continued certificate creation.
Tax Benefits
Beyond the certificate schemes, commercial solar installations may attract several tax advantages. The ATO’s instant asset write-off provisions have applied to eligible depreciating assets in recent years and solar systems often qualify. Businesses can also claim the GST on the purchase price back through their BAS, and systems not meeting the instant write-off threshold are depreciable over their effective life, reducing taxable income each year.
Before modelling your solar savings, it is also worth having a clear picture of your current energy costs. Our guide to what is actually on your energy bill breaks down every line item so you know exactly what you are offsetting. Speak with your accountant about which tax provisions apply to your specific situation.
State and Territory Rebates in 2026
The federal STC and LGC schemes are the primary incentive mechanisms for commercial solar across Australia, but several states and territories offer additional programs on top. These vary significantly in eligibility, scope, and value, and some change with little notice. Always verify current availability directly with the relevant government agency or your installer before making decisions based on any state-level program. You can also use our Energy Rebate Finder to check what is available in your state quickly.
Victoria
Victoria has the most active state-level support for commercial solar in Australia right now. Through the Victorian Energy Upgrades (VEU) program, a new deemed activity for commercial and industrial solar launched in September 2025, targeting businesses, councils, schools, hospitals, and other non-residential sites.
Eligible non-residential premises including warehouses, factories, offices, and community organisations can access upfront discounts on 30kW to 200kW solar systems, with indicative discounts of up to approximately $34,300 for a 200kW system based on Victorian Energy Efficiency Certificate (VEEC) pricing. The actual value depends on the VEEC spot price at the time of installation.
Businesses installing systems between 30kW and 100kW can stack VEU discounts with federal STCs, while those installing 100kW to 200kW systems can stack VEU discounts with LGCs. This makes Victoria particularly attractive for mid-sized commercial installations. Smaller businesses should also note the Solar Homes Program offers a rebate of up to $1,400 for eligible solar installations, along with an interest-free loan of the same amount.
New South Wales
NSW businesses benefit from the federal STC scheme, but the state’s direct solar panel rebate programs have largely concluded. The main state-level opportunity is the Energy Savings Scheme (ESS), which provides financial incentives for energy-saving upgrades delivered through Accredited Certificate Providers who create Energy Savings Certificates on behalf of the business. The ESS is funded until 2050 under NSW’s net zero framework.
For battery storage, NSW support in 2026 is primarily focused on the Peak Demand Reduction Scheme (PDRS), which allows accredited installers to create Peak Reduction Certificates for eligible battery systems connected to approved Virtual Power Plant programs.
Queensland
Queensland businesses benefit from above-average STCs due to the state’s high solar irradiance, with Brisbane falling in Zone 2. The federal rebate goes further here than in most southern states.
The Queensland Business Energy Saving and Transformation (QBEST) scheme has offered rebates to qualifying small and medium-sized businesses with 2 to 199 full-time employees, aimed at installing energy-efficient equipment that reduces consumption and costs. Funding rounds have been time-limited, so check the Business Queensland website for current availability before assuming the program is open.
Queensland businesses should also be aware of the broader changes underway in the state’s energy market. Our breakdown of Queensland’s New Energy Roadmap explains what the state’s transition to renewables means for power prices and business energy costs going forward.
South Australia
South Australia has among the highest rates of rooftop solar penetration in the world and a sophisticated energy market to match. Zone 2 solar irradiance applies across much of the state, providing strong STC values per kilowatt installed.
The state’s Retailer Energy Productivity Scheme (REPS) VPP incentive allows businesses with eligible battery systems to access additional rebates of up to $2,050 by connecting to an approved Virtual Power Plant. For businesses considering pairing commercial solar with battery storage, this stacking opportunity is worth factoring into the business case.
Western Australia
Western Australia operates its own electricity grid through Synergy and Horizon Power, creating a distinct regulatory environment from the eastern states. Businesses on the South West Interconnected System benefit from the federal STC scheme and can access LGCs for systems over 100kW.
WA offers substantial battery incentives, with up to $5,000 available for Synergy customers and up to $7,500 for Horizon Power customers, along with no-interest loan options. WA’s high electricity prices, strong solar resource, and relatively flexible export conditions make it one of the more economically compelling states for commercial solar investment.
Tasmania
Tasmania’s solar incentive landscape is more limited than the mainland states, reflecting its lower solar irradiance and smaller commercial base. Tasmania is typically classified as Zone 4, which produces fewer STCs per kilowatt than mainland zones. Businesses can still access the federal STC scheme and the national Cheaper Home Batteries Program.
The state’s Business Energy Efficiency Scheme (BEES) has supported businesses with significant annual electricity consumption to invest in energy efficiency and electrification upgrades. Check with the Tasmanian Department of State Growth for current availability.
Australian Capital Territory
The ACT’s Sustainable Household Scheme offers zero-interest loans from $2,000 to $15,000 for energy-efficient upgrades including battery storage and electric appliances, with repayment periods of up to 10 years. The ACT Business Energy and Water Program allows eligible small-to-medium businesses to access rebates of up to $10,000 for energy-efficient technology upgrades, with the maximum available for gas-to-electric conversions.
Northern Territory
The NT’s Home and Business Battery Scheme has now closed, having reached its funding cap. Businesses can still access the federal Cheaper Home Batteries Program and federal STCs. Darwin falls in Zone 1, which has the highest solar irradiance of any Australian capital, making it one of the strongest locations in the country for STC generation per kilowatt installed.
Please note: state and territory programs change regularly. The above reflects the position as understood in February 2026. Always verify current program status directly with the relevant government agency or through our Rebates and Upgrades page before proceeding.
How to Finance a Commercial Solar System
Cash Purchase
Paying upfront gives you full ownership from day one, the maximum long-term return, and access to all available tax benefits immediately. For businesses with available capital it is typically the highest-return option over a 7 to 15 year ownership horizon.
Green Loans and Solar Finance
Many banks and specialist lenders offer green loans or solar-specific finance products with competitive rates. Monthly repayments are often less than the electricity savings generated, meaning the system can be effectively cash-flow neutral or positive from the outset. Model this carefully with your accountant or financial adviser before committing.
Solar Leasing and Power Purchase Agreements (PPAs)
Under a lease or PPA, a third party owns the system and either charges you a monthly lease fee or sells you the power it generates at an agreed rate. These arrangements require little to no upfront capital, which suits businesses that want to reduce energy costs without a large initial outlay. The trade-off is that long-term savings are lower, as a portion of the value flows to the system owner rather than your business.
Choosing a Quality Commercial Solar Installer
The installer you choose has as much impact on your outcome as the equipment itself. A well-designed, correctly installed system from a reputable company will outperform a cheaper alternative within a few years, and that difference compounds over a 25-year panel lifespan. For a deeper look at why the cheapest quote rarely delivers the best outcome, read our article on the real cost of cheaper solar and battery installers.
When evaluating installers, look for Clean Energy Council (CEC) accreditation, which is required for your system to be eligible for STCs and most state rebates. Ask about relevant commercial experience and request references from similar-sized projects. A quality proposal will name the specific panel and inverter brands, explain why those products were chosen, and include workmanship warranties of at least 5 to 10 years alongside standard manufacturer warranties. An installer with a local presence is far more accountable for ongoing service and warranty claims than one based interstate.
Avoid anyone using high-pressure tactics, offering quotes that seem implausibly cheap, or unable to provide verifiable local references.
What Happens During Installation?
A typical commercial solar installation follows this sequence. First, the installer visits for a site assessment to inspect the roof or site, assess structural integrity, review electrical infrastructure, and finalise the system design. For larger systems this may involve a formal engineering report.
Next, permits and approvals are handled by your installer with your local council where required, your electricity distributor, and your retailer. Grid connection approvals can take several weeks and are often the longest part of the process.
Installation itself is typically completed in one to three days for systems up to around 100kW, with larger systems taking longer depending on complexity. Once installed, the system is inspected, connected to the grid, and tested, with commissioning usually following within one to two weeks. Finally, you receive access to a monitoring platform, either web-based or via an app, to track generation, self-consumption, and export in real time.
Ongoing Maintenance
Commercial solar systems are largely low-maintenance, but some basic care protects your investment. An annual professional inspection is recommended to check electrical connections, mounting hardware, and inverter performance. Panels near agricultural operations or construction sites may need periodic cleaning, and most installers offer annual maintenance packages. Notify your business insurer about the installation so the system is appropriately covered under your policy.
Ready to Compare Commercial Solar Quotes?
Commercial solar pricing and equipment quality vary considerably between installers. Getting at least two or three quotes allows you to compare price, equipment specifications, warranty terms, and design approach side by side. A lower quote is not always better value if it involves lesser-known panels, a shorter workmanship warranty, or an inexperienced team.
Compare Your Rates connects businesses with pre-qualified commercial solar installers, making it straightforward to compare tailored quotes without spending weeks researching individual companies.
If you are also considering adding battery storage, our guide to solar panels and battery storage for Australian homes covers how storage changes the economics of a solar investment. To check what government rebates apply to your business, head to our Rebates and Upgrades page or run a quick search through our Energy Rebate Finder.
