In this article
SolarNerds counted every solar and battery system registered in Western Australia in 2025 and published the leaderboards as the Solaris Awards. PSW Energy, counted together with Perth Solar Warehouse, came fourth in the state for solar and third for batteries. Nobody entered anything. It is a tally of certificate registrations, which is both the strength of it and the whole of it.
PSW's Solaris results
- Fourth in WA for solar, 2025: 6,128 kW across 724 systems, about 2.3 per cent of the state's installed capacity.
- Third in WA for batteries: 10,398 kWh across 673 systems, about 3.1 per cent of the state's battery capacity.
- By segment: fourth in 0–15 kW, third in 15–40 kW, third in batteries.
- The source is the Clean Energy Regulator's certificate registry. Not applied for, not voted on, not sponsored.
- The badges read Top 5 Solar Installer and Top 5 Battery Installer. Fourth and third are the places behind them.
- It measures volume. It says nothing about whether a system was designed for your roof.
The Solaris ranking method
SolarNerds takes the Clean Energy Regulator's Renewable Energy Certificate registry — the record created when a system is registered for STCs — and ranks companies by capacity installed. There is no submission, no entry fee and no judging panel. If a system was registered in WA in 2025, it is in the count.
The badges are worded Top 5 Solar Installer and Top 5 Battery Installer, Western Australia. The underlying rankings are fourth for solar and third for batteries.
PSW's WA rankings
Fourth in WA on solar, from 6,128 kW across 724 systems. That works out at about 8.5 kW average, which is the residential end of the market — the ordinary Perth job rather than a warehouse roof. Third in WA on batteries, from 10,398 kWh across 673 systems.
Two point three per cent of a state's solar. That number is smaller than the ranking sounds, and both things are true at once: WA's installer market is fragmented across hundreds of companies, so fourth place is a couple of per cent. Anyone quoting you a market-share figure in this industry is quoting a small number.
Average battery sizes
The average battery PSW installed in 2025 was smaller than the state average, and that is deliberate.
| Average home battery installed in WA, 2025 | Capacity |
|---|---|
| PSW Energy and Perth Solar Warehouse | 15.5 kWh |
| Western Australia, all installers | 17.7 kWh |
Two kilowatt-hours is not a scandal. But a battery is sized against evening load, not against ambition, and the sensible answer for a house that empties at 8am is usually a smaller battery than the one being pitched. Both figures are up sharply on the 5 to 10 kWh that was normal a few years ago, which is the real trend: households are covering the whole evening now, not just the fridge.
Worth naming a trap the raw numbers set. Six hundred and seventy-three batteries against 724 solar systems does not mean 93 per cent of solar customers took a battery — a large share of battery installs are retrofits onto solar that went on years ago, so the two counts are not the same households. The same caution applies to the state figures. Battery uptake in WA is rising fast; the attach rate is not the way to measure it.
WA installation totals
WA registered 269,913 kW of solar across 30,678 systems in 2025, and 339,587 kWh of batteries across roughly 19,192 systems. Solar capacity was 5.9 per cent down on 2024. Nearly 80 per cent of the capacity came from systems of 15 kW or less.
A market that stops growing is not a market in trouble. It is a market where most of the good north-facing roofs already have panels on them, and the work shifts to batteries, to replacing failed inverters, and to the homes that were sold something undersized in 2015. The pressure to sign today comes off, which is the part that benefits a buyer.
Using the rankings when choosing an installer
Use a volume ranking for one thing: confirming a company is a real operation rather than a sales front that subcontracts and disappears. Fourth and third in the state means the crews out of Bibra Lake and Neerabup are on roofs every working day, and that the service desk has seen your inverter model before.
Do not use it as proof the quote in front of you is right. A ranking cannot know your switchboard, your phase, your export limit, or whether the battery you have been offered is twice what your evening actually uses. Those are questions for the design, and the honest answer is sometimes a smaller system than you came in for.
Batteries we currently fit are in the battery range, and the WA rebate position is on the rebate page. If you want the numbers applied to your address rather than the state, ask for a written price.
Source: SolarNerds.com.au, Solaris Awards 2025, Western Australia, from Clean Energy Regulator REC registry data. Every figure on this page was re-checked against that page on 20 August 2026: 6,128 kW across 724 systems at 2.27 per cent, 10,398 kWh across 673 systems at 3.06 per cent, fourth in 0–15 kW and third in 15–40 kW.