Commercial Solar in Australia: What Business Owners Need to Know Before Investing

What Is Commercial Solar?

Commercial solar refers to photovoltaic (PV) systems installed on business premises — from small retail shops and warehouses to large industrial facilities and office complexes. While the fundamentals are similar to residential solar, commercial installations operate at a larger scale, carry different financial structures, and are subject to specific regulatory requirements under Australian standards.

For Australian business owners, investing in commercial solar has become one of the most compelling ways to reduce operating costs, lower carbon emissions, and future-proof against rising electricity prices.

Typical System Sizes and Costs

Commercial solar systems in Australia generally range from 10 kilowatts (kW) up to several megawatts (MW), depending on the size of the premises and energy consumption.

System Size	Typical Application	Estimated Cost (AUD)
10–30 kW	Small business, retail shop	$10,000–$30,000
30–100 kW	Medium warehouse, office	$28,000–$80,000
100–250 kW	Large facility, industrial	$75,000–$180,000
250 kW+	Commercial complex, factory	$180,000+

Prices vary based on panel quality, inverter brand, roof type, and installation complexity. These figures reflect post-STC pricing, meaning the Small-scale Technology Certificate discount has already been applied.

Small-scale Technology Certificates (STCs)

STCs are a federal government incentive under the Renewable Energy Target (RET) scheme. When a business installs an eligible solar system under 100 kW, it can generate STCs based on the expected energy output over a set deeming period.

These certificates are typically assigned to the installer at point of sale, reducing the upfront cost of the system. The value of each STC fluctuates with market conditions but has generally hovered between $35 and $40 AUD in recent years.

For systems above 100 kW, businesses may be eligible for Large-scale Generation Certificates (LGCs) instead, which operate under a different trading mechanism and can provide ongoing revenue over the life of the system.

State-Based Rebates and Incentives

In addition to federal STCs, several Australian states offer their own rebates and support programmes for commercial solar:

• Victoria: The Solar for Business Program has offered rebates of up to $3,500 for eligible small businesses. Check the Solar Victoria website for current availability.
• New South Wales: The Empowering Homes Program and various interest-free loan schemes have supported commercial uptake, with additional programmes announced periodically.
• Queensland: Interest-free loans and rebates have been available through the Queensland Government's Business Energy and Jobs Plan.
• South Australia: Businesses may access support through the Energy Productivity Program and subsidised energy audits.
• Western Australia: The Distributed Energy Buyback Scheme (DEBS) allows eligible commercial customers to receive payment for excess energy exported to the grid.

Incentive programmes change frequently, so it is worth checking with your state energy authority or a qualified installer for the most current information.

Key Considerations Before Installing

Before committing to a commercial solar investment, business owners should assess the following:

• Roof suitability: Assess roof orientation, pitch, shading from nearby structures, and available area in square metres. North-facing roofs in Australia receive optimal sunlight.
• Structural integrity: Commercial roofs must be assessed by a structural engineer to confirm they can support the additional load of aluminium racking and solar panels.
• Network connection: Systems above certain thresholds require approval from your local Distribution Network Service Provider (DNSP). This process can take several weeks.
• Energy consumption profile: Solar performs best when energy use is highest during daylight hours. Businesses with significant after-hours consumption may benefit from battery storage.
• Metering: A smart meter capable of recording import and export data is required for grid-connected systems and feed-in tariff eligibility.

Australian Standards and Compliance

All commercial solar installations must comply with AS/NZS 5033 (installation of photovoltaic arrays) and AS 4777 (grid connection requirements). Electrical work must be carried out by a licensed electrician, and the system designer and installer should hold a valid licence in the relevant state or territory.

Documentation including a Certificate of Electrical Safety and network connection approval must be completed before the system is commissioned.

Getting the Right Installer

The quality of your installation directly affects system performance, safety, and warranty outcomes. Working with a Clean Energy Council (CEC) accredited installer ensures your system is designed and installed to the required Australian standards, and is a mandatory requirement for accessing STC rebates. The CEC accreditation database is publicly searchable, making it straightforward to verify a company's credentials before signing any contract.