State / Territory Guide

Solar Panel Cost in WA (2026)

Model WA solar ROI with local electricity rates, STC rebates, and installer cost benchmarks.

Last updated: 2026-06-25 · Source label: AEMO electricity data, Australian installed-cost benchmarks, BOM/PVGIS solar assumptions, Clean Energy Regulator STC policy context

Western Australia has the sunniest capital in the country — Perth averages 5.2 peak sun hours per day, the highest of any Australian state capital. Combined with installed costs around A$1.00/W, a standard 6.6 kW system runs about A$6,600 before incentives and roughly A$3,900 after the national STC discount of ~A$2,700. Grid electricity from Synergy sits near 28c/kWh on the South West Interconnected System, with Horizon Power serving regional WA. What makes WA distinctive is the Distributed Energy Buyback Scheme (DEBS): instead of a flat feed-in tariff, exports earn about 10c/kWh during the evening peak (3-9pm) and only around 2.5c/kWh at other times. That time-based structure rewards homes that can shift exports — or store solar in a battery — toward the peak window. With strong sun and low hardware costs, payback is typically 4-5 years. A west-facing panel string can lift late-afternoon output into the higher-value DEBS window.