Commercial solar installation in Adelaide

Midday demand is already met

AEMO reports that rooftop solar supplied 22 per cent of South Australia’s underlying consumption in 2024–25, and that South Australia was the first jurisdiction to implement an emergency backstop to curtail rooftop solar. SA Power Networks lists turning off large-scale solar systems such as shopping centres and factories among its steps if AEMO directs curtailment. In the last quarter of 2025, South Australian spot prices were negative in 48.4 per cent of intervals, and zero or negative in 88 per cent of daytime intervals. Value an Adelaide system on the energy the site uses itself, not on export.

Connection bands at 30, 500 and 1,500 kVA

SA Power Networks approves systems up to 30 kVA automatically where technical requirements are met and there is no known network constraint. From 31 to 500 kVA is medium embedded generation, where most connection offers are made within 65 days of payment. Above 500 kVA is large, with indicative timelines of 20, 40 and 65 business days for the feasibility study, engineering report and connection offer. Low-voltage connections go up to 1,500 kVA; above that a high-voltage connection is required.

Remote control is part of the connection

South Australia requires every new solar system connected to the network, unless it is permanently zero-export, to be capable of remote disconnection through a registered relevant agent, and SA Power Networks’ standard requires it of the inverters in every system above 30 kVA. Systems above 200 kVA need interface protection, and systems able to export more than 200 kW need remote monitoring and control. Dynamic export capability, which lets the export limit be changed remotely, has been required for new exporting systems up to 30 kW since 1 July 2023, and for systems over 30 kW to 200 kW since 1 July 2024; zero-export and SCADA-connected systems are exempt or deemed to comply. Medium-system requirements are unchanged for now, but SA Power Networks plans a new offer for 31 to 500 kVA systems in early 2027: a choice of zero export or flexible exports, using CSIP-AUS inverters on a reliable internet connection. It expects that to remove the need for dedicated SCADA at many sites between 200 and 500 kVA.

The demand window depends on where you are

Sites using more than 160 MWh a year are on SA Power Networks’ large low-voltage business tariffs: LBAD by default, with LBADF and LBMD by choice. Each has a summer peak-demand charge from November to March, measured from 11am to 5pm on workdays in the CBD and from 5pm to 9pm every day elsewhere. Outside the CBD that window starts as solar output fades, so a battery or a load shift, not more panels, is what reduces it. Large business tariffs carry no export tariff.

State schemes and council finance

No South Australian Government grant for business solar or batteries is open: the Powering Business Grant and the Home Battery Scheme have closed. The Retailer Energy Productivity Scheme runs from 2026 to 2030 and gives retailer-delivered discounts that a business can ask a participating retailer about, whoever supplies it; for business sites it covers commercial lighting, refrigerated display cabinets and measured demand savings, plus air conditioners and water heaters for sites using less than 160 MWh a year; each retailer chooses which activities it offers, and the specification excludes solar. Its battery activity, connecting a battery to an approved virtual power plant, is limited to homes and to businesses using less than 160 MWh a year at the meter. Councils mostly offer finance: Building Upgrade Finance, repaid through a council charge on the land, is available from the City of Adelaide, which names solar as eligible, and the City of Marion, for commercial, industrial and agricultural buildings at least two years old. Within postcodes 5000 to 5006, the City of Adelaide also offers rebates on solar and batteries.

Planning approval and heat

Installing solar of up to 5 MW on the roof of a building is excluded from “development” under South Australia’s planning regulations, so it needs no development approval, except on a State heritage place, on a local heritage place where the panels can be seen from the street, or for a system over 100 kg that does not meet the flush-mounting and accredited-installer conditions; check before relying on tilt frames. Adelaide’s West Terrace station averages 16.9 days a year at 35 °C or more and 2.6 at 40 °C or more, and reached 46.6 °C on 24 January 2019, its highest on record. Heat reduces panel and inverter output, and SA Power Networks’ flexible demand tariffs set their firm peak on summer days of 38 °C or more at West Terrace.

Commercial solar in Adelaide: common questions

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