Photovoltaic module prices have risen for the fourth consecutive month, driven by strong demand for energy independence despite falling upstream costs such as polysilicon.
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Australia's solar curtailment crisis and frequent negative pricing events are fundamentally changing how developers approach renewable energy projects, with co-located battery storage shifting from an optional add-on to essential infrastructure.
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According to the Solar Choice Price Index, the average cost of a 5kW solar system in Australia as of September 2025 is about $1. 13 per watt – or about $5,110 – after the STC rebate has been deducted and including GST.
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The Australian government's Department of Industry, Science and Resources has indicated that lithium-ion batteries are poised to “dominate” stationary storage for durations under 4-hours, but alternative technologies could surpass them for long-duration energy.
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