Solar Panel Cost in Idaho (2026)
Developing incentives Average installed cost: $2.62/watt · Typical payback: 14-17 years
Idaho solar cost breakdown
| Metric | Idaho |
|---|---|
| Cost per watt (low–avg–high) | $2.35 – $2.62 – $2.95 |
| 8.6 kW system cost (before incentives) | $20,210 – $25,370 |
| Average residential electricity rate | $0.11/kWh |
| Average peak sun hours/day | 5.3 |
| Typical payback period | 14–17 years |
| Federal tax credit (cash/loan, 2026) | Not available (expired 12/31/2025) |
Idaho-specific incentives
Idaho allows homeowners to deduct 40% of solar costs from state taxable income in year one (capped) and 20% in each of the following three years, but very low electricity rates from hydropower mean the payback period is one of the longest in the country in raw dollar terms.
Quick facts
Cities in Idaho
Frequently asked questions
How much do solar panels cost in Idaho?
As of 2026, solar panels in Idaho average $2.62 per watt installed, typically ranging $2.35-$2.95/W depending on system size, roof complexity, and equipment tier. A common 8.6 kW residential system runs roughly $20,210-$25,370 before any remaining state incentive.
Is there a state solar tax credit in Idaho?
Idaho allows homeowners to deduct 40% of solar costs from state taxable income in year one (capped) and 20% in each of the following three years, but very low electricity rates from hydropower mean the payback period is one of the longest in the country in raw dollar terms.
What's the typical payback period for solar in Idaho?
Most Idaho homeowners see a payback period of 14-17 years based on current electricity rates and remaining incentives, since the federal 30% tax credit no longer applies to cash or loan purchases in 2026.
Does the federal solar tax credit still apply here?
No — the 30% federal Residential Clean Energy Credit (Section 25D) expired for cash and loan purchases on December 31, 2025. It only remains available indirectly through solar leases and PPAs, where the financing company claims a separate commercial credit.
Not financial, tax, or legal advice. Figures on this page are 2026 estimates based on industry aggregator data (EnergySage marketplace medians, SEIA/Wood Mackenzie market insight, and regional installer data) and are provided for general informational and comparison purposes only. Actual pricing, incentive eligibility, and payback periods depend on your specific roof, usage, equipment, and local program rules. Confirm current incentive details at dsireusa.org and consult a licensed tax professional and local installers before making a purchase decision.