Commercial Solar Perth
Free commercial solar ROI analysis for Perth businesses. System sizing, LGC eligibility, tax depreciation, and payback calculation in 90 seconds.
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LAST UPDATED: MARCH 2026 · DATA: CLEAN ENERGY REGULATOR & STATE SOURCES
KEY TAKEAWAYS — PERTH
• 100 kW system: $105,000–$120,000 installed — saving $34,822/year
• 200 kW system: $180,000–$210,000 — saving $69,643/year + $12,914 LGC revenue
• Peak sun hours: 5.4h/day — excellent commercial solar potential
• Commercial electricity rate: 30c/kWh — every self-consumed kWh avoids this cost
• LGC-eligible (≥100 kW) — earning ~$12,914/yr extra at 200 kW
In This Guide
Commercial Solar in Perth
Perth businesses are increasingly turning to commercial solar to control electricity costs, generate LGC revenue, and improve sustainability credentials. With 5.4 peak sun hours per day and commercial electricity rates averaging 30c/kWh, the economics have never been more compelling for Perth businesses investing in 50 kW to 500 kW+ rooftop solar systems.
Local Insight
Perth has the highest peak sun hours of any Australian capital at 5.4 hours/day — making it one of the best commercial solar locations in the world. The mining services, resources, and logistics sectors around Welshpool, Kewdale, and Canning Vale are particularly well-positioned for large commercial installations.
Commercial Solar Costs & System Sizes — Perth
Costs shown are estimated installed costs before STCs or LGC-related considerations. Annual savings assume 70% self-consumption at 30c/kWh.
| System Size | Installed Cost | Annual Savings | Incentive | Payback |
|---|---|---|---|---|
| 50 kW | $60,000–$67,500 | $17,411/yr | STCs | 3.2 years |
| 100 kW | $105,000–$120,000 | $34,822/yr | STCs | 2.3 years |
| 200 kW | $180,000–$210,000 | $69,643/yr + $12,914 LGC | LGCs * | 2.2 years |
| 500 kW | $450,000–$525,000 | $174,108/yr + $32,285 LGC | LGCs * | 3–5 years |
* LGC = Large-scale Generation Certificates. Additional revenue for systems >=100 kW, ~$42/MWh at current market.
LGCs & INCENTIVES — WA
Government incentives for Perth businesses
LARGE-SCALE GENERATION CERTIFICATES
$42/MWh
For systems >=100 kW. Every MWh generated earns one LGC sold into the market as additional revenue.
SMALL-SCALE TECHNOLOGY CERTIFICATES
Up to $35k
For systems under 100 kW. Applied as a point-of-sale discount — reduces upfront installation cost immediately.
TAX DEPRECIATION
25–30%
Effective cost reduction through capital allowances or instant asset write-off. Consult your accountant.
STATE — WA
Varies
Additional state-level programs may apply. Your installer can advise on current WA commercial opportunities.
Is Commercial Solar Worth It in Perth?
In short, yes — and the business case is strong. With 5.4 peak sun hours and commercial electricity at 30c/kWh, a 200 kW Perth commercial solar system saves approximately $69,643/year in electricity costs plus $12,914 in LGC revenue — totalling around $82,557/year in annual benefit. At installed costs of $180,000–$210,000, payback is approximately 2.2 years, after which the system produces near-free electricity for 15–20 more years.
2.3yr
TYPICAL PAYBACK
$825k+
10-YEAR BENEFIT
25yr
PANEL WARRANTY
With commercial electricity prices rising 3–5% annually across WA, these savings increase every year. A commercial solar system also improves your business's sustainability credentials, reduces exposure to energy price volatility, and may add to the value of your commercial property.
Best Business Types for Commercial Solar in Perth
Warehouses & Logistics
Large roof areas, high daytime loads. Often LGC-eligible at 100–500 kW.
Best ROI candidate
Schools & Institutions
Daytime-only operation — perfect solar load alignment. Typical 3–5 year payback.
Excellent match
Manufacturing & Industrial
High electricity consumption and large roof areas make for compelling ROI at scale.
Strong candidate
Retail & Shopping Centres
High HVAC loads align with solar generation. Flat roofs enable efficient large-array layouts.
Good candidate
Not sure if your business qualifies? Use our commercial scorecard — enter your electricity bill and business type to get a personalised ROI analysis in 90 seconds.
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Frequently Asked Questions — Commercial Solar Perth
How much does commercial solar cost in Perth?
Perth commercial solar costs $880–$1,050 per kW installed for systems above 50 kW — some of the lowest installed costs in Australia due to Perth's competitive installer market and high solar resource. A 100 kW system typically runs $88,000–$105,000, while 200 kW installations range from $170,000–$200,000 before incentives.
Is Perth the best city for commercial solar ROI in Australia?
Perth consistently achieves the strongest commercial solar ROI in Australia. With 5.4 peak sun hours per day — the highest of any capital city — combined with competitive installed costs and WA's commercial electricity rates averaging 30c/kWh, payback periods of 2.5–4 years are common for well-positioned Perth businesses.
What industries in Perth get the best commercial solar results?
Mining services and resources companies in Welshpool, Kewdale, and O'Connor with large workshop and warehouse facilities are ideal candidates. Perth's food and beverage manufacturing sector (Canning Vale, Jandakot) and the expanding logistics precincts in the Southern River and Cockburn areas also achieve excellent results.
Does WA have its own grid which affects commercial solar?
Yes — Perth and the south-west are on the SWIS (South West Interconnected System), managed by Synergy. WA has its own grid connection rules and feed-in arrangements. Systems above certain thresholds require SWIS connection approval. Your installer will handle this, but it's worth factoring 6–8 weeks for approvals on larger systems.
What's the LGC revenue for Perth commercial solar?
Perth's high irradiance makes LGC revenue especially attractive. A 200 kW Perth system generates approximately 350 MWh/year, earning around $14,500–$15,000 in LGC revenue at current prices, plus approximately $50,000–$60,000 in annual electricity savings — over $65,000 total annual benefit.
Can Perth businesses connect large commercial solar to the Synergy grid?
Yes, but systems above 30 kW require Western Power network approval and Synergy metering changes. For larger systems (100 kW+), a pre-connection enquiry to Western Power is strongly recommended before system design. Your commercial solar installer will manage this process, typically taking 6–10 weeks.