Rooftop solar in Ontario has become much more viable as panel costs have dropped and electricity rates have climbed. Here’s the 2026 breakdown.
Net metering in Ontario:
Export excess generation at full retail electricity rate, credited on your bill for up to 12 months. Systems up to 10 kW (Class A). Requires: system design, licensed contractor installation, ESA permit + inspection, interconnection agreement with your local distribution company (LDC).
System sizing for Ontario’s climate:
- GTA: ~1,350 peak sun hours/year
- 6 kW system on south-facing roof: ~7,000-8,000 kWh/year
- Average Ontario household uses: 9,000-10,000 kWh/year
- Net-zero electricity (before EV): typically requires 8-10 kW system
GTA installation costs (2026):
- 6 kW: $16,000-$24,000
- 8 kW: $20,000-$30,000
- 10 kW: $24,000-$36,000
Simple payback at current Ontario rates: 8-14 years.
Critical: Assess roof condition before installing. Removing and reinstalling panels for a roof replacement adds $3,000-$6,000 to reroofing cost. If shingles have less than 10-15 years remaining life, replace roof first.
Has anyone completed a solar install in the GTA recently? What was your actual installed cost per kW?
Solar and energy questions at home.renovation.reviews