Call for greater focus on maintenance as rooftop solar fleet grows

Australia has installed 28 GW of rooftop solar across about 4 million homes and small businesses, or roughly 36% of households. An industry expert warns that inadequate inspection and maintenance are causing premature failure and performance loss in the aging fleet. The first half of 2026 saw 181,000 installations, a 35% increase on the same period in 2025. The concern is that panels designed to operate for 25 years or more are being decommissioned early due to neglected faults, undetected damage, and lack of proactive maintenance.

Where this fits

This is a materials and whole-system cost problem hiding in the installation headline. The rooftop solar rollout counts as capacity deployed, but if a significant share fails or underperforms before design life, the real cost per unit of delivered energy is higher than the per-megawatt-hour price of the panels suggests. More importantly for a weather-dependent grid: failing rooftop solar means less daytime output when it is needed, forcing greater reliance on gas firming. The cost of the transition is not only the hardware and transmission. It includes the operational and maintenance overhead of a distributed, aging fleet that was never designed to be managed as critical infrastructure.

What it means

Australia is building a grid that depends on millions of small, privately owned devices that lack systematic inspection or coordinated upkeep. A large share of the rooftop fleet will soon be a decade old, and the industry has no mature framework for detecting and fixing faults at scale before they cascade into grid stress. This is not a problem unique to solar, but it is a problem solar creates: a firm generator like a nuclear plant has a single operator, scheduled maintenance windows, and spare parts budgeted from the start. A distributed solar fleet does not. Reliability, in a renewables-heavy grid, becomes a data and logistics problem as much as a physics one.