Commercial solar installation in Townsville and North Queensland

Townsville has the highest mean solar exposure of the cities we serve, by the Bureau of Meteorology’s station figures, and a long cooling season to use it. A North Queensland design also has to answer to Ergon’s network rules, regional Queensland’s retail arrangements and cyclonic wind loads.

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Commercial solar in Townsville

Townsville at a glance

Network: Ergon Energy Network
STC zone: Zone 3 (1.382)
Solar exposure: 21.1 MJ/m² a day
Output per kW: ~1,463 kWh a year*
Noon sun height: 47° June · 86° December
Strongest month: October

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 57% of the strongest, October. A steady cooling or refrigeration load can use the output in every month of the year.

Sun through the dry tropics

Townsville Aero averages 21.1 MJ/m² of solar exposure a day across the year, peaking at 25.7 in November and falling only to 15.5 in June, with 120.8 clear days a year on average. That shallow winter dip suits a site with steady year-round cooling or refrigeration. Size against the interval data: a system that covers weekday daytime load will still export at weekends and on public holidays.

Regional retail rules for large sites

In regional Queensland, regulated retail prices are available to customers using less than 100 MWh a year. A large business keeps access to regulated prices only while it stays with Ergon Energy Retail; once it switches to a market retailer, neither it nor any future customer at that premises can return. From 1 July 2026 the Queensland Competition Authority added a large-customer “solar soaker” retail tariff, 50C. Check the retail position before modelling savings, because it decides which tariff the solar is measured against.

Ergon’s network tariffs

Ergon Energy Network serves regional Queensland. Business sites using 100 MWh a year or more are large customers, and a large site with a smart meter defaults to Large TOU Demand & Energy. Ergon’s other large-customer tariffs include Large Dynamic Flex Storage, and from 2026–27 it is trialling Dynamic Business tariffs for sites that pair a battery with on-site generation or controllable load.

Mount for cyclonic wind

The Queensland Reconstruction Authority classifies coastal areas north of Bundaberg as Wind Region C. Its guidance is to fasten solar panels to the roof structure through the cladding, not to the cladding alone, and the Queensland Building and Construction Commission has flagged poorly secured solar panels as a cyclone hazard. Racking and roof fixings for a commercial system need engineering for cyclonic wind loads, and the roof itself needs checking before panels go on.

Industry, the port and the evening peak

The 4,915-hectare Townsville State Development Area, 2 km south of the port, holds refineries, an abattoir and a peaking power station, and the Coordinator-General decides development applications there. Port of Townsville’s Quayside Terminal pairs 430 solar panels with 60 battery banks, predicted to supply 10 per cent of the port’s annual electricity. Ergon’s 2024–25 peak came at 7pm on 23 January 2025, after solar output had fallen, and Energy Queensland is trialling a 4 MW/8 MWh community network battery at Bohle Plains: moving midday solar into the evening is the work the network needs.

Connections above 30 kVA

Ergon 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 offer limits export to 15 kW in total for systems over 30 kVA and up to 100 kVA and 30 kW for systems over 100 kVA and up to 200 kVA, and excludes SWER lines; dynamic export and anything larger are negotiated. 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. Inland, Charters Towers is in Ergon’s West pricing zone; Townsville, Burdekin and Hinchinbrook are East.

Commercial solar in Townsville: common questions

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

The federal incentive is small-scale technology certificates (STCs), which installers usually take as an upfront discount. For the example postcode 4810 (Townsville 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.

Who is the electricity distributor in Townsville?

Ergon Energy Network, which the Australian Energy Regulator lists for country and regional Queensland. Your bill names the distributor.

What STC zone is Townsville in?

Townsville postcodes 4810 to 4818 fall within 4737 to 4822, which is Zone 3 under the 2019 zone-ratings instrument, with a rating of 1.382. Mackay (4740) is in the same row.

Does a Queensland commercial system need an emergency backstop device?

Yes. All new and replacement inverter systems of 10 kVA and above in Queensland must be fitted with a generation signalling device, which can be activated only as a last resort at AEMO’s direction. Queensland Treasury says it has not been used to date.

Is there a Queensland rebate for business solar in Townsville?

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.

Can a Townsville 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.

Sources

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

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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 20° to the north would give the most generation, about 5% more (1,537 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 4810, 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.