Q2 Solar & Battery Statistics: Record 56,000 Batteries Sold⚡2025

Solar Installation & Capacity Statistics in 2025

In the first half of 2025, there were 115,584 rooftop solar installations, according to the Clean Energy Council's Jan-Jun solar statistic 2025 report.

Even though the solar installation total was 18% lower than the 12 months prior, rooftop solar contributed 12.8% in generation share compared to 11.5% the year prior.

Accompanying the total of 1 GW of large-scale solar projects, the total capacity of installed rooftop solar reached 1.1 GW in the first half of 2025, with 4.2 million systems which produce 26.8GW of renewable generation.

New South Wales continues to have the highest installed rooftop solar capacity at 7.5 GW (over a quarter of Australia's capacity). However, Queensland saw the highest amount of total capacity installation in a 6-month period, reaching 326 MW compared to NSW's 321 MW.

Australia's Solar Statistics for the Second Quarter 2025

In conjunction with typical yearly patterns, solar installation and capacity dipped during mid-year months around wintertime, and begins to increase as warmer weather arrives, increasing from last year’s results.

Comparing the average solar system sizes in the second quarter of each year since 2017, it displays an upward trend in average system size.

The Northern Territory had the biggest growth and highest national average at 14.1kW, which is most likely due to the reduction of total system installations and increase in larger systems in the commercial and off-grid sectors.

NSW, ACT, SA, and QLD all resulted in averages surpassing more than 10kW, projecting strong growth in solar adoption, particularly in the commercial side of things.

Courtesy of the Energy Council. 

Solar Replacements vs. Brand New Installation Statistics

As time continues, more older systems are becoming outdated and require replacements which contributes to a portion of the total amount of installed systems. The Clean Energy Regulator’s Q2 2025 data workbook gives us some estimated data around how solar system replacements contribute to the total installation numbers across each state in Australia.

Since 2021, Australia’s solar system replacement portion has increased from 10% of systems, to 22% of the total installations being replacement system installations.

Comparing the second quarter of 2025 with other second quarters, we see that the figure of solar replacements has been slowly increasing, and QLD having the highest replacement rate of 32%.

New South Wales figures have been slowly increasing over the past 5 years, resulting in 17% of total solar system installations being replacements.

With older systems consisting of older technology which isn’t as durable as modern components, we expect this number to continue to increase slowly over time.

Home Solar Battery Statistics in August 2025

According to a recent report from the Clean Energy Regulator (CER), there have been over 23,925 more battery units installed in August 2025.

Whilst originally reporting on 19,592 solar battery installations totalling 356.5 MWh in July alone, the CER’s new report resulted in over 23,925 more solar batteries installed alongside new and existing solar systems since July 1, now totalling 825 MWh of capacity.

It’s also important to note that these numbers include approved and pending applications for STC’s, and don’t include failed applications or those who have applied yet.

These numbers show us a strong demand for solar battery storage from Australians, particularly after the start of the Cheaper Home Batteries Program incentive.

Average Solar Battery Capacity (kWh) in Australia 2025

Australia’s national average nominal installed battery size has increased to 19kWh.

Since July 1^st, 2025, Australia saw 43,517 new solar battery installations, with NSW leading the charge at 15,418 installations and an average of 19.6kWh, QLD consisting of 8,572 installations and an average of 20.7kWh.

NSW: 15,418 installations (19.6kWh average)

QLD: 8,572 installations (29.7kWh average)

SA: 6,415 installations (18.2kWh average)

VIC: 6,945 installations (17.9kWh average)

WA: 4,577 installations (16.6kWh average)

ACT: 865 installations (18.8kWh average)

TAS: 580 installations (16.5kWh average)

NT: 145 installations (24.8kWh average)

Wholesale Electricity & Energy Statistics Q2 2025

In addition to solar and battery statistics for Australia, a report from the Australian Energy Regulator has been released to show wholesale electricity data and highlights from Q2 2025. Here were solar and battery-related key findings.

• Compared to Q2 2024, wholesale electricity prices increased in all regions in Q2 2025.
• In all regions except NSW which stayed the same, electricity prices increased compared to the previous Q2.
• There were a lot more high-price events this quarter (66 vs 19 last year), especially in QLD, VIC, SA and TAS.
• There were also more negative-price periods (when generators pay to supply power) due to strong rooftop solar and big wind/solar farms flooding the grid with cheap power.
• Coal generation was down because of more plant outages (planned and unplanned).
• Batteries played a bigger role: they set the market price up to 23% of the time despite only making ~1% of total power, especially in the evening peak.
• New renewable and battery projects: 1,456 MW of new capacity came online (mainly wind, solar and batteries), but most only started generating late in June.