Commercial solar installation in Brisbane

For a Brisbane commercial site, start with the relationship between rooftop generation, daytime operations and the demand recorded at the meter. Roof area alone cannot establish the useful size of a system.

Vitalic delivers commercial and industrial energy systems Australia-wide, bringing solar, battery storage and control into one site assessment.

Commercial solar in Brisbane

Brisbane at a glance

Network: Energex
STC zone: Zone 3 (1.382)
Solar exposure: 18.5 MJ/m² a day
Output per kW: ~1,385 kWh a year*
Noon sun height: 39° June · 86° December
Strongest month: December

Panels on a low-pitched roof catch the high summer sun well and the low winter sun less, so output follows the seasons.

The weakest month, June, gives 46% of the strongest, December. Size against the months the site needs energy most, not the annual total.

Read the demand profile before filling the roof

Compare weekday production or office hours with weekends and shutdown periods. A system sized for a busy weekday can produce an export surplus when the building is quiet. If a large load starts early or runs into the evening, compare load scheduling and battery dispatch with adding more panels. The assessment should show which measure addresses the actual expensive intervals.

Design for the Energex tariff you are actually on

Brisbane is within Energex’s network. Its approved 2026–27 tariffs make Large TOU Demand & Energy the default for large low-voltage business sites, alongside a Large Dynamic Flex Storage tariff, and a Dynamic Business tariff trial for sites that pair a battery with solar or controllable load. A demand tariff changes what a battery is worth: the question is which intervals set the charge, not how many kilowatt-hours the battery holds.

Treat the connection as a design input

Confirm the site’s existing connection, export permission and proposed changes before relying on export revenue. A meter, switchboard or protection requirement can change the scope even where there is ample roof space. Include proposed EV charging and planned production expansion in the same review rather than treating them as unrelated future projects.

Bring a usable starting pack

Provide the site address, a recent bill, interval data and any existing solar documents. For a leased property, identify who can approve roof access and electrical changes. We use those inputs to compare solar, storage and control options against the same operating baseline.

Heat, flood and the evening peak

Brisbane’s city station averages 74.3 days a year at 30 °C or more (1999 to 2026), more than twice the 32.5 at Gold Coast Seaway and 30.6 at Sunshine Coast Airport, so cooling runs through more of the year away from the coast. Brisbane City Council’s free FloodWise Property Report gives the flood levels for each property; check it before placing a battery, inverter or switchboard at ground level. Energex’s 2024–25 summer peak of 5,839 MW came at 5:30pm on 22 January 2025, and it estimates rooftop solar cut that peak by about 309 MW, which leaves the hours after 5pm for a battery.

Connections above 30 kVA, and network payments

Energex charges an enquiry fee of $1,432.73 excluding GST for systems from 30 kVA, and an application fee of $3,435.46 for 30 to 200 kVA. Its basic connection offer limits export to 15 kW in total for systems over 30 kVA and up to 100 kVA, and to 30 kW for systems over 100 kVA and up to 200 kVA; anything else, including dynamic export, is a negotiated connection. An enquiry gets a site-specific response within 45 business days of a complete submission (complex connections can take longer), and a negotiated offer comes within 65 business days of a complete application. Energex also pays for network support: its September 2026 request seeks batteries, demand response and other non-network options on feeders at Caboolture West, Morayfield North and North Maclean, north and south of the city, at indicative values of $45 to $60 per kVA a year.

Queensland support for business energy

Queensland has no state rebate for business solar or batteries in October 2026. What is open is sector-specific: ecoBiz gives free coaching, manufacturers with five or more staff can get a subsidised energy and emissions benchmark for $2,140 or $2,680, and primary producers can borrow up to $1.3 million over up to 20 years through QRIDA’s Sustainability Loan. In south-east Queensland, retail prices for sites using 100 MWh or more a year have been deregulated since 2012, so the retail contract is negotiated. Rooftop solar is accepted, self-assessable building work in Queensland, although it must still meet the structural and wind provisions.

Commercial solar in Brisbane: common questions

What is the government rebate on a 100 kW solar system in Brisbane?

The federal incentive is small-scale technology certificates (STCs), which installers usually take as an upfront discount. For the example postcode 4000 (Brisbane City, Zone 3), a new 100 kW system installed in 2026 creates 691 STCs (100 kW × 1.382 × 5 years). At the Clean Energy Regulator’s reported spot price of $39.85 that is about $27,500. This is a postcode example, not a site eligibility check. Confirm your own site’s postcode and eligibility. The figure for a 100 kW system falls each year as the scheme approaches its 2030 end.

Which electricity distributor serves Brisbane businesses?

Energex, which the Australian Energy Regulator lists as the distributor for Brisbane, the Gold Coast, the Sunshine Coast and surrounds. Your bill names the distributor for your connection.

What STC zone is Brisbane in?

Brisbane postcodes 4000 to 4416 are Zone 3 under the 2019 zone-ratings instrument, with a rating of 1.382. The rating sets how many certificates a system up to 1 MW can create.

Is there a Queensland rebate for business solar in Brisbane?

Not in October 2026. The Queensland Government’s QBEST rebates are no longer offered, and no state program funds solar or batteries for a general commercial site. Sector programs are open: free ecoBiz coaching, a subsidised energy benchmark for manufacturers, and QRIDA’s Sustainability Loan for primary producers, which names solar. The federal certificates still apply.

Does commercial rooftop solar need building approval in Queensland?

Installing photovoltaic panels on the roof of a building is accepted, self-assessable building work under the Building Regulation 2021, so no building approval is lodged. The work must still meet the building assessment provisions, including structure and wind loads.

Can a Brisbane business claim certificates on a system larger than 100 kW?

From 1 October 2026, new solar systems above 100 kW and up to 1 MW can create small-scale technology certificates (STCs), with a fixed deeming period to 2030. The Clean Energy Regulator says applications for these systems open in mid to late November 2026, and evidence of network connection approval is required. Only capacity installed on or after 1 October 2026 is eligible, so an extension earns certificates on the added panels only.

Does a commercial battery earn certificates in Queensland?

Only for the first 50 kWh of usable capacity, and at reducing rates above 14 kWh, under the Cheaper Home Batteries Program, which businesses can use for batteries of 5 to 100 kWh. A larger commercial battery is justified by the demand charges and energy costs it reduces rather than by certificates.

More on commercial battery storage and what makes a battery a strategic asset.

Sources

Confirm requirements for your specific connection with the distributor named on your bill.

Compare the options for your site

Explore commercial solar, battery storage, intelligent control and EV charging, or read how they work together. For a starting estimate from your annual electricity use, try the solar sizing calculator.

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* Illustrative. Output is modelled with PVGIS 5.3, EU Joint Research Centre for 1 kW laid flat, 14% system losses and 2005–2023 weather; a real system depends on its roof, shading and equipment. Panels tilted 29° to the north would give the most generation, about 11% more (1,535 kWh per kW), but need frames that usually cost more than the extra output earns. Solar exposure is the Bureau of Meteorology’s long-term station mean. The 100 kW certificate example uses postcode 4000, its statutory zone rating and 5 deeming years, with the count rounded down. The displayed value is floored to $100 at the Clean Energy Regulator’s reported spot price; installers usually take certificates as an upfront discount. A site’s postcode and eligibility require confirmation.