LAST UPDATED: MARCH 2026 · DATA: CLEAN ENERGY REGULATOR & STATE SOURCES
Thornlie solar fact
Thornlie holds Perth's record for the fastest street-level solar adoption — in 2023, one cul-de-sac off Spencer Road went from 0% to 100% solar adoption in 11 months, after the first installer completed a job visible from the street
Estimated Monthly Output — 6.6kW
kWh/month · peak: Dec (632 kWh)
Solar in Thornlie — What You Need to Know
Thornlie is City of Gosnells' most populous suburb, a community of 1970s–80s brick homes on 600–750m² lots that has become one of Perth's strongest solar markets. The suburb's story is partly demographic — high owner-occupier rates (72%), working-class families with motivation to reduce bills, strong community networks — and partly geographic: Thornlie's flat topography and inland position (11km from the coast) mean consistent solar access across virtually all streets without shading or marine-grade concerns. The Thornlie installer market is highly competitive, with multiple businesses specifically targeting the suburb in their marketing, keeping prices at Perth's lower end. City of Gosnells' solar programs run across Thornlie, with the municipality offering free roof assessments and rebate application assistance. The suburb's emerging reputation as a solar success story is reinforced by visible panel density: driving through Thornlie's residential streets, more than 1-in-3 homes are visibly solar-equipped.
Solar Panel Cost in Thornlie 2026
| System | Cost after STCs | Annual savings | Feed-in |
|---|---|---|---|
| 5kW | $2842–$3344 | $1620+ | 2.25c |
| 6.6kW ★ | $3344–$4484 | $2160 | 2.25c |
| 10kW | $4347–$5829 | $3024+ | 2.25c |
FAQs — Solar in Thornlie
How much do solar panels cost in Thornlie?
A 6.6kW system in Thornlie 6108 costs $3344–$4484 after federal STC rebates in 2026.
Is solar worth it in Thornlie?
Thornlie earns a A- (Very Good) solar grade with a score of 82/100. 39% of homes here already have solar.
What size solar system for Thornlie?
6.6kW suits most Thornlie homes. Larger homes with pools or EVs should consider 10kW+. WA's feed-in tariff is 2.25c.
Solar in Nearby Suburbs
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Going Solar in Thornlie
Thornlie, in the Perth region of WA, receives approximately 5.4 peak sun hours per day — well above the national average of 4.2 hours. With electricity rates of approximately 33c/kWh and Zone 1 Small-scale Technology Certificates (STCs) applying in this area, the financial case for solar in Thornlie is moderate.
At 39% solar adoption, Thornlie is already a solar leader in the region. This means experienced local installers are readily available and the grid operator has well-established processes for residential solar connections.
A 6.6kW solar system in Thornlie costs approximately $3344–$4484 after STC rebates. At 5.4h daily sun and 33c/kWh electricity, you can expect annual savings of approximately $82 — giving a payback period of 48.8–79.3 years, followed by 20+ years of near-free electricity.
The electricity network in Thornlie is managed by Western Power (metro Perth) or Horizon Power (regional). Western Power manages Perth's network. Export limits of 1.5–5kW apply on many residential connections — check before sizing your system. For residential systems above 5kW, a network connection application is typically required — your installer will handle this as part of the installation process.
Solar Rebates in Thornlie
Homeowners in Thornlie () access the following solar incentives in 2026:
Zone 1 FEDERAL STCs
Zone 1 STCs worth $3,200–$4,000 off a 6.6kW system. STCs are applied as a point-of-sale discount — your installer handles the paperwork.
STATE: WA
Distributed Energy Buyback Scheme (DEBS) provides feed-in credits for export
FEED-IN TARIFF
WA currently offers approximately 2.25c/kWh for excess solar exported to the grid. Self-consumption saves 33c/kWh — 14.7x more than exporting.
What Size Solar System for Thornlie?
The right system size depends on your electricity usage. A quick rule: divide your quarterly bill by $100 to get your ideal system size in kW. For Thornlie, common household sizes are:
With WA's feed-in tariff at 2.25c/kWh and electricity at 33c/kWh, the priority is maximising self-consumption rather than grid export. If your household is away during peak solar generation hours (10am–3pm), adding a battery to shift solar to evening use improves payback. See our solar battery guide for battery options and payback analysis.
Compare all system sizes — 5kW to 13kW →More Guides
How to Choose a Solar Installer in Thornlie
With dozens of solar installers operating in the Perth area, choosing the right one for Thornlie requires a few checks. Here's what to look for:
Our free solar score tool connects you with up to 3 CEC-accredited, vetted installers in Thornlie — saving you the time of calling around. Every installer in our network has verified reviews and local Perth experience.