Best time to buy solar in Perth: seasonal and market timing

The "best time to buy solar" question gets asked constantly, and the honest answer is: the timing effect is smaller than most people think. Solar system prices in Perth don't vary dramatically by season. But there are genuine timing considerations that affect your experience — and a few specific calendar milestones that matter.

Why solar prices don't swing dramatically by season in Perth

The Perth residential solar market is competitive and relatively commoditised at the commodity end (6.6kW–10kW systems with standard panel brands). Installer margins are generally thin, and the wholesale panel and inverter market prices are set globally. A seasonal "sale" that cuts the price 30% is almost always either misleading (the pre-sale price was inflated) or uses lower-grade components.

Genuine seasonal factors that exist:

End of financial year (May–June): Some Perth installers run EOFY promotions to clear stock or meet sales targets. Discounts are typically 5–10% for comparable specifications — meaningful but not transformative. This is also the period when quote volume increases significantly, which can push out install timelines.

Post-Christmas/New Year (January–February): The opposite of EOFY — installer capacity is often available, some component clearance pricing may exist, and quote turnaround is faster. January–February is arguably the best time for a prompt, competitively priced installation.

The single biggest timing factor: the Western Power NCN

The Western Power Network Connection Notice (NCN) is the rate-limiting step in most Perth solar projects. NCN processing time is typically 4–8 weeks, though it can extend to 10–12 weeks during peak periods.

When does NCN demand peak? Broadly in spring and early summer (October–December), driven by the combination of EOFY purchases that don't install until school holidays, the "getting ready for summer" mindset, and first-quarter government rebate program announcements. If you want to be generating in December, you need to start the process in September at the latest.

Planning backward from when you want the system running:

• System running: December 1 (first summer month)
• Synergy meter reconfiguration: 2–6 weeks after commissioning
• NCN approval and installation: mid-October start
• Quote comparison and contract: early October
• Therefore: begin comparison now (September)

Getting the NCN in early is the most effective way to control your solar timeline.

July 1 tariff changes: the annual Synergy rate reset

Every 1 July, Synergy adjusts electricity tariffs. The FY2026–27 tariff saw the A1 rate increase to 33.2621c/kWh (from FY2025–26 levels). This annual increase pattern has been consistent in WA — electricity prices have risen roughly 3–7% annually over the past decade.

What this means for solar timing: Installing solar before a July 1 tariff increase maximises your savings at the new higher rate immediately from July 1. Installing solar in August means you capture the full year of savings at the new rate. This is a modest consideration — one month of savings foregone is not material in the 6–10 year payback timeline — but it's a real effect.

DEBS rates are reset on the same July 1 schedule. The super off-peak export rate (10c/kWh) and off-peak rate (2c/kWh) have been stable since DEBS launched in 2020, but can theoretically change on 1 July each year. Installing before any potential DEBS rate reduction (if WA government ever chooses to lower them) locks you into the current rate — though this is speculative.

WA Battery Incentive timing

The WA Battery Incentive ($130/kWh, up to $1,300 for 10kWh batteries on the Synergy SSL) has been available since 2019 and has been periodically renewed. Unlike one-off stimulus schemes, this is a standing program — no "last chance" deadlines have been announced as of mid-2026.

The incentive is claimed at the time of battery installation. If the government changes the program, installations already approved but not yet complete would typically be grandfathered. Waiting to see if the battery incentive improves is speculative — the current rate is known and the future rate is unknown.

The practical timing recommendation

If you're ready to proceed with solar, the best time is when you have:

1. Three written quotes to compare
2. A clear understanding of your consumption pattern (12 months of Synergy bills)
3. Confirmed the installer is CEC-accredited and has NCN experience

Waiting for a "better deal" that's months away typically means:

• Missing a full year (or full summer) of generation savings
• Assuming solar prices will fall further (they've stabilised in the 2024–2026 period after the rapid falls of 2012–2022)
• Assuming incentive programs will improve (uncertain)

The exception: If you're about to refinance, sell the property, or make other major financial decisions in the next 6 months, defer solar until your property and financial position is stable.

There's no magic month to buy solar in Perth. The most meaningful timing factor is the Western Power NCN timeline — start the process early enough to be generating for summer. If EOFY promotions make a 5–10% difference on an equivalent specification, they're worth considering. For most Perth households, the sooner you install, the sooner the savings start — and the savings compound over 20+ years.