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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