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Is Solar Worth It in WA?

Updated 2026|8 min read
Written by Jacob Ramilo, Last reviewed 2026. This guide provides general information only. See how we calculate the estimates.

Perth receives high levels of sunshine, but your export time affects what Synergy pays. DEBS pays 2c/kWh before 3pm or after 9pm and 10c/kWh from 3–9pm[2].

Solar Conditions in WA

Perth is in STC zone 3, which means the upfront discount from the federal scheme is similar to what you get in Sydney. The real difference in WA is the solar resource. It can produce more kilowatt-hours per kilowatt of panels every year than any other capital[1].

Most unshifted rooftop exports occur before 3pm, inside the 2c band. The 10c band is more useful to west-facing generation or controlled battery exports. Synergy applies DEBS credits only to the first 50kWh exported per day[2], so modelling every exported kWh at a single average rate can overstate the return.

System Costs in WA

A quality 6.6kW system in Perth typically costs between $4,500 and $7,000 installed. There are fewer installers in WA compared to the eastern states, which can push prices up slightly and stretch wait times. The federal STC scheme provides the standard upfront discount based on your zone[3].

WA has no state-level rebate to add on top, but also no means test or income cap. The application process is relatively simple compared to states with additional rebate requirements.

Why Your Daytime Usage Matters

Under Synergy DEBS, most daytime exports earn 2c. You can improve the result by using more solar at home. Every kilowatt-hour you use directly saves the applicable retail usage rate. The size of that gap depends on the household tariff and the time of export.

Homes where someone is home during the day, or that can shift appliances like air conditioning and pool pumps into daylight hours, do much better. If most of your usage is in the evening, solar will take longer to pay off.

Worked Example: A Perth Home

Assume you use 18 kWh a day and buy a 6.6kW system for $5,500 after STCs. If you use 50% of the solar directly and receive 2c for daytime exports, the estimate looks like this:

Annual generation (6.6kW): ~9,800 kWh (high irradiance)
Self-consumed (50%): 4,900 kWh × $0.28 saved = $1,372
Exported (50%): 4,900 kWh × $0.02 = $98
Total annual benefit: ~$1,470
Payback: $5,500 ÷ $1,470 ≈ 3.7 years

That works well because of strong self-consumption. Drop to 25% daytime usage and the annual benefit falls to about $855, pushing payback past 6 years. Daytime usage is everything in WA.

The 1 May 2026 Connection Rule Change

New rules apply to solar and battery systems installed or upgraded on the South West Interconnected System from 1 May 2026. Systems under 30kVA need communication equipment to join future flexible export plans. If you do not join, or cannot keep a stable internet connection, you can still use your solar at home but the standard export setting is 1.5kW[4]. The change does not affect systems installed or upgraded before that date. Ask your installer to state the connection option and export setting in your quote.

See what solar could mean for you

Upload your electricity bill or enter your usage manually, and we'll estimate your payback period, savings, and system size based on your actual usage.

Frequently Asked Questions

Common questions about solar in WA

Is solar worth it in WA in 2026?

Solar can be worthwhile in WA if you use enough of it at home. Synergy's DEBS pays 2c/kWh before 3pm or after 9pm and 10c/kWh from 3pm to 9pm. Most rooftop solar exports occur before 3pm, so your daytime usage matters.

How much does a 6.6kW system cost in WA?

A quality 6.6kW system in Perth typically costs between $4,500 and $7,000 installed. Prices are competitive but WA has fewer installers than the eastern states, which can affect availability.

What is the feed-in tariff in WA?

Synergy DEBS pays 2c/kWh before 3pm or after 9pm and 10c/kWh from 3–9pm. Buyback credits apply to the first 50kWh exported each day. Horizon Power areas use different arrangements.

Does WA have a state solar rebate?

WA doesn't have a separate state rebate on top of the federal STC scheme. There's also no means test or income cap, so the process is straightforward. The federal STC discount still applies based on your zone.

Is solar worth it with Synergy’s low FiT?

It depends on your daytime usage. If you run appliances such as air conditioning or a pool pump during the day, you can use more solar directly. Your main saving comes from avoiding the retail usage rate, not from low-value daytime exports.

Is solar worth it in regional WA?

Regional WA has even better solar irradiance than Perth. However, installation costs can be higher due to travel, and some regional areas are on different tariff structures. It's worth getting a local installer quote.

Related guides

This guide is for informational purposes only and does not constitute financial or investment advice. Solar savings estimates vary by household. Always consider your own circumstances and consult a qualified professional before making a purchase decision.