Commercial solar in Perth
A 100 kW commercial system in Perth earns about $25,567 off upfront in federal certificates and makes about 138 MWh a year. Systems up to 1 MW now qualify, so the discount scales with your roof.
We don’t install. We give you the numbers for Perth, then hand you to Green, our solar partner, who designs and installs commercial systems across Western Australia and the rest of Australia.
What commercial solar is worth in Perth
For systems installed in 2026, using the Clean Energy Regulator’s zone 3 rating for Perth (1.382 MWh per kW per year) and $37 a certificate.
| System | Output a year | Certificates | Upfront discount | Indicative saving a year |
|---|---|---|---|---|
| 30 kW | 41 MWh | 207 | $7,659 | $6,000 |
| 99 kW | 137 MWh | 684 | $25,308 | $19,800 |
| 250 kW | 346 MWh | 1,727 | $63,899 | $50,000 |
| 500 kW | 691 MWh | 3,455 | $127,835 | $100,000 |
| 1 MW | 1,382 MWh | 6,910 | $255,670 | $200,000 |
Savings are scaled from the federal government’s worked example (a 250 kW system saving about $50,000 a year, as reported) by Perth’s solar output. Your real saving depends on how much you use on site and your tariff. Up to 100 kW uses the small-scale deeming period; over 100 kW gets a fixed 5 years.
Each kW in Perth is rated to make about 17% more power than the same kW in Melbourne or Hobart.
Business power prices in Perth
In Western Australia, small business electricity prices are set by the state rather than the national default offer, so we don’t show a figure here. The rule still holds: solar you use on site saves your full usage rate, while exports earn far less, so businesses with daytime load pay back fastest.
The local network is Western Power. Larger systems need its connection approval, which is often the longest step, so Green starts that application early.
Get a commercial solar quote in Perth
Green, our solar partner, designs and installs commercial systems in Perth, from 30 kW to 1 MW, and handles the certificates and network approval. Free, no obligation, and we earn a commission only if you go ahead.
Get a commercial quoteCommercial solar in Perth: questions
- How much is the commercial solar rebate in Perth?
- It comes as federal certificates (STCs) that your installer takes off the price. In Perth (CER zone 3), a 100 kW system installed in 2026 earns 691 certificates, about $25,567 at $37 each. A 250 kW system earns about $63,899. The certificate price moves, so treat these as estimates.
- How much power does commercial solar make in Perth?
- The Clean Energy Regulator rates Perth at 1.382 MWh per kW per year, so a 100 kW system is deemed to make about 138 MWh a year. Real output depends on roof direction, shading and tilt.
- Does the commercial solar rebate drop in the new year?
- For systems up to 100 kW, yes: the deeming period shortens each 1 January, so a 99 kW system in Perth drops from about $25,308 off in 2026 to about $20,239 in 2027. Systems over 100 kW (up to 1 MW) get a fixed 5-year deeming period, so their certificate count doesn't drop in 2027.
- Who installs commercial solar in Perth?
- We pass enquiries to Green, our solar partner, which designs and installs commercial systems across Australia, including Perth. You get one installer, not a lead auction, and we earn a commission only if you go ahead.
Commercial solar in other cities
Reviewed by James Baker, Founder, EnergyPlans.com.au. Data last verified 12 November 2026. Methodology.