Pricing solar in Western Australia starts with the rebate stack: federal STCs, then WA-specific support, then the federal Cheaper Home Batteries Program for eligible storage. Federal STCs are the main upfront solar discount for WA households. Retailer products and regional Horizon Power programs vary; the federal Cheaper Home Batteries Program (~$372/kWh usable since 1 July 2025) is the consistent national storage subsidy to itemise on quotes. This page shows how to read a WA quote so discounts are real — and why CEC accreditation is non-negotiable for STCs.
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Indicative 2026 pricing: a typical 6.6kW system often quotes around $5,000–$8,000 after the STC discount (metro installs often $5,000–$7,500; premium/regional can run higher). See our solar cost guide.
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Small-scale Technology Certificates are created when a CEC-accredited installer commissions an eligible system under 100 kW. Certificate volume depends on system size, deeming years remaining to 2030, and your STC zone. Perth is typically Zone 3 in MrSolar defaults. For a 6.6kW system that currently maps to about $1,435 at the $39.85/STC spot reference (as of 2026-08-05). The discount should appear as a clear point-of-sale line item. Ask the installer to show the certificate or voucher maths with your postcode, the $39.85 spot assumption (as of 2026-08-05) where STCs apply, and a separate line for any Cheaper Home Batteries Program dollars (~$372/kWh usable since 1 July 2025). Perth heat derating and Western Power vs Horizon rules separate good quotes from generic ones. Save PDFs of every plan, approval and datasheet — warranty claims years later depend on that trail.
Federal STCs are the main upfront solar discount for WA households. Retailer products and regional Horizon Power programs vary; the federal Cheaper Home Batteries Program (~$372/kWh usable since 1 July 2025) is the consistent national storage subsidy to itemise on quotes. Never double-count the same dollar across STC and state paperwork. If a salesperson cannot name the administering agency, pause the sale. Ask the installer to show the certificate or voucher maths with your postcode, the $39.85 spot assumption (as of 2026-08-05) where STCs apply, and a separate line for any Cheaper Home Batteries Program dollars (~$372/kWh usable since 1 July 2025). Perth heat derating and Western Power vs Horizon rules separate good quotes from generic ones. Photograph your switchboard and roof planes before quoting day to cut variation risk.
Live nationally since 1 July 2025: roughly $372 per kWh of usable capacity — about $3,720 off a 10 kWh usable pack before state top-ups. Federal Cheaper Home Batteries Program (~$372/kWh usable); confirm any Horizon Power regional battery offers separately. Quotes must show usable kWh, not only nominal kWh. Ask the installer to show the certificate or voucher maths with your postcode, the $39.85 spot assumption (as of 2026-08-05) where STCs apply, and a separate line for any Cheaper Home Batteries Program dollars (~$372/kWh usable since 1 July 2025). Perth heat derating and Western Power vs Horizon rules separate good quotes from generic ones. Save PDFs of every plan, approval and datasheet — warranty claims years later depend on that trail.
Metro 6.6kW after STC often $4,800–$7,200 before hot-climate extras. Zone 3 STC context ~$1,435 for 6.6kW at $39.85 as of 2026-08-05. Ask the installer to show the certificate or voucher maths with your postcode, the $39.85 spot assumption (as of 2026-08-05) where STCs apply, and a separate line for any Cheaper Home Batteries Program dollars (~$372/kWh usable since 1 July 2025). Perth heat derating and Western Power vs Horizon rules separate good quotes from generic ones. Photograph your switchboard and roof planes before quoting day to cut variation risk. Ask the installer to show the certificate or voucher maths with your postcode, the $39.85 spot assumption (as of 2026-08-05) where STCs apply, and a separate line for any Cheaper Home Batteries Program dollars (~$372/kWh usable since 1 July 2025). Perth heat derating and Western Power vs Horizon rules separate good quotes from generic ones. Save PDFs of every plan, approval and datasheet — warranty claims years later depend on that trail.
Non-CEC installers, non-approved products, missing serial documentation and incomplete DNSP paperwork are classic failure modes. Heritage overlays are the usual planning exception; Western Power rules dominate otherwise. Coastal corrosion north of the river and inland heat inland of the scarp change hardware selection. Keep assignment forms — they are your rebate paper trail. Ask the installer to show the certificate or voucher maths with your postcode, the $39.85 spot assumption (as of 2026-08-05) where STCs apply, and a separate line for any Cheaper Home Batteries Program dollars (~$372/kWh usable since 1 July 2025). Perth heat derating and Western Power vs Horizon rules separate good quotes from generic ones. Save PDFs of every plan, approval and datasheet — warranty claims years later depend on that trail.
Module temperature coefficients and inverter thermal derating show up in real Perth summers. Ask for roof plane photos, stringing plans and inverter mounting locations that avoid enclosed western brick ovens. If storage is on the roadmap, specify a ventilated battery location early so the Cheaper Home Batteries Program discount (~$372/kWh usable) is not wasted on a thermally abused pack. Keep decisions grounded in your interval data, roof constraints and written DNSP settings rather than national averages or salesperson screenshots. Perth heat derating and Western Power vs Horizon rules separate good quotes from generic ones. Photograph your switchboard and roof planes before quoting day to cut variation risk.
MrSolar matches WA homeowners with up to three CEC-accredited installers who already work with Western Power (metro); Horizon Power (regional). Ask each to itemise STC dollars (zone + spot assumption), state rebate/loan status, and any Cheaper Home Batteries Program discount. Compare identical scopes — free quotes, no obligation, and no fabricated star ratings. Keep decisions grounded in your interval data, roof constraints and written DNSP settings rather than national averages or salesperson screenshots. Perth heat derating and Western Power vs Horizon rules separate good quotes from generic ones. Save PDFs of every plan, approval and datasheet — warranty claims years later depend on that trail.
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Written and reviewed by Daniel (Marketplace lead, Epic Unicorn Pty Ltd). We build pages from Australian solar datasets and regulatory references, then map you to CEC-accredited installers only.
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