How does Australia maintain its leading position in rooftop solar power?

Australia's solar PV installations hit a record 5.3 GW in 2024, marking a market recovery and highlighting the country's unique position as a Rooftop Solar economy.

According to the International Energy Agency (IEA), large-scale ground-mounted solar installations reached 2 GW in 2024, bringing installations back to the peak levels of 2018-2019. Rooftop installations in the residential, commercial, and industrial (C&I) sector remained stable at 3.2 GW, allowing Australia to maintain its focus on distributed generation, unlike most global markets.

Despite Australia's record-high annual installations, it failed to rank among the top ten global markets for the second consecutive year, ending a ranking it had held since the IEA's Photovoltaic Systems Programme (PVPS) began tracking market dynamics in the 1990s.

This shift reflects the rapid expansion of solar markets in other regions, while Australia's growth has stabilized.

Nevertheless, it is worth noting that Australia's rooftop solar industry remains a world leader, with installations expected to exceed 27 GW in the first half of 2025.

Rooftop Solar Dominance Drives Market Growth Australia's solar landscape remains fundamentally different from the international market, with rooftop installations continuing to drive demand.

Over 40% of Australian detached homes currently operate rooftop Solar Systems, supported by government incentives that will continue until 2030, providing lower upfront capital costs. Solar currently accounts for approximately 20% of the country's total electricity demand.

The strength in the residential sector reflects the success of the Small Renewable Energy Scheme (SRES), which created trading certificates that can be redeemed for upfront capital subsidies for systems not exceeding 100 kW.

This mechanism has enabled Australia to achieve a world-leading per capita installed capacity of over 1.52 kW, with a cumulative total of over 4 million units installed nationwide.

Regional differences indicate widespread adoption of the technology, with nearly 50% of detached homes in Queensland and South Australia equipped with solar systems. Some areas within these states report rooftop solar density exceeding 60%. Tasmania, with lower solar radiation levels of only 3.7 kWh per year, has a more moderate adoption rate in detached homes, at approximately 20%.

In 2024, the average residential installation size grew to nearly 10kW, peaking in December and exceeding 10kW, an increase from less than 9kW in 2021-2022.

This growth prompted a market classification adjustment, expanding the threshold for residential systems from 0-10kW to 0-15kW. Commercial and industrial installations are now classified as 15-100kW systems.

System prices continued to decline, with a typical residential installation price of AUD 1.20 per watt (approximately USD 0.78), excluding subsidies, which were reduced by an additional AUD 40 per watt based on solar radiation levels.

Module prices hit a record low, with a typical crystalline silicon module price of AUD 0.20 per watt in 2024, down from AUD 0.30 per watt in 2023, reflecting global manufacturing overcapacity.

Large-scale ground-mounted solar recycling and policy framework evolution: Large-scale solar projects of 5MW and above contributed 2GW to the total annual installations, representing a recovery in recent years, bringing the cumulative centralized solar installation capacity to 13.4GW.

The large-scale ground-mounted solar sector benefits from large-scale generation certificates under the Renewable Energy Target, which provides annual revenue based on energy generation rather than upfront subsidies.

The Australian government's Capacity Investment Scheme (CIS) aims to deliver an additional 40 GW of generation capacity by 2030, an increase from the initial target of 32 GW announced in July 2025.

The scheme aims to achieve 23-26 GW of renewable energy generation capacity and 9-14 GW of clean dispatchable capacity, creating a pathway for continued large-scale ground-mounted solar development.

Policy challenges remain regarding grid approval, congestion management, and fragmented access arrangements, increasing the cost and risk of grid-scale projects.

The Australian Energy Market Operator (AEMO) implements strict curtailment rules to limit large-scale solar generation to ensure grid system stability. South Australia frequently experiences curtailment, with 1100 MW of large-scale solar capacity and over 1800 MW of wind capacity.

With the accelerated installation of Solar Power and the rapid deployment of battery storage, 31,120 residential battery packs were registered in 2024, with an average capacity of approximately 7 kWh.

The cumulative total reached 124,425 residential battery systems, demonstrating the deepening integration of solar power generation and energy storage technologies. The "More Affordable Residential Battery Scheme," launched in 2025, is expected to drive significant battery adoption, complementing the resurgence of solar energy.

Australia's solar manufacturing industry began in the 1990s with companies such as Tideland, Solarex, and BP Solar, and regained attention in 2024. In March 2024, the federal government announced a AU$1 billion "Solar Sprint" to support the commercialization of Australian solar innovation and strengthen the local supply chain.

At the end of the first round of the "Solar Sprint," prefabricated solar structure supplier 5B became the first beneficiary. Other beneficiaries included Australian module manufacturers Tindo Solar, Solquartz, Energus, and Stellar PV. The second round of the scheme was launched earlier this year.

Currently, domestic manufacturing capacity is limited to approximately 100MW, primarily from Tindo Solar; however, the policy framework aims to rebuild previously competitive domestic capabilities, with production previously shifted to Germany and subsequently to China.

Grid Integration Challenges and Market Prospects
By the end of 2024, the cumulative installed capacity will reach 40GW, including 26.1GW of distributed solar and 13.4GW of centralized solar.

With excellent solar radiation conditions, this capacity now meets more than 20% of the nation's electricity demand, presenting both opportunities and challenges for grid management.

South Australia demonstrates the potential and challenges of high solar penetration, with rooftop solar power alone capable of supplying the entire state during midday hours, and surplus generation exported to neighboring states.

Achieving this in a jurisdiction with 1.77 million residents showcases the scalability of distributed solar resources.

Grid access reforms remain incomplete since the Energy Security Commission closed in May 2023, with different access arrangements being developed by different jurisdictions. This decentralization of regulation introduces complexity and administrative overlap, potentially impacting future development.

If implemented, several large-scale potential projects targeting energy exports and green mineral processing could add 4GW annually, representing a potentially transformative growth in the large-scale ground-mounted solar sector. These developments will enable Australia to utilize its solar resources for industrial applications and international energy trade.