EnergyTools

Solar Cost Per Watt in Idaho

Average $$2.90/W • Rank #$22 of 51 • 12.5-year payback • Updated 2026

Urgent tax credit deadlines

  • Section 30D EV credit (up to $7,500) — expires June 30, 2026 (12 days left).
  • Section 48E solar ITC safe harbor — construction must start by July 4, 2026 (16 days left).
See the full deadline tracker

Cost Per Watt

$2.90

avg in Idaho

vs National

$-0.17

(-5.5%)

Payback (8kW)

12.5 yrs

avg

Sun Hours/Day

4.1

peak

Comparing installer quotes in Idaho?

Use our free Quote Comparison Tool — normalizes cost per watt, verifies production with NREL, and flags misleading quotes.

Compare Quotes →

Cost Per Watt by System Size in Idaho

Cost per watt typically decreases for larger systems (economies of scale).

$3.19
4kW
$3.04
5kW
$2.96
6kW
$2.90
7kW
$2.84
8kW
$2.75
10kW
$2.67
15kW

Bars show Idaho's $/W for each system size. Lower = better value.

System Size Cost Per Watt Total Cost vs National Avg
4 kW $3.19/W $11,600 +$0.12
5 kW $3.04/W $14,500 $-0.03
6 kW $2.96/W $17,400 $-0.11
7 kW $2.90/W $20,300 $-0.17
8 kW $2.84/W $23,200 $-0.23
10 kW $2.75/W $29,000 $-0.32
15 kW $2.67/W $43,500 $-0.40

Solar Cost Overview for Idaho

In Idaho, the average installed cost for residential solar is $2.90 per watt, with typical systems ranging from $2.90/W to $2.90/W depending on the installer, equipment quality, and roof complexity. Idaho ranks #22 out of 51 states (1 = cheapest) for solar affordability — 20 states have cheaper solar.

Idaho is below the national average — solar is competitive here.

What's Driving Idaho's Solar Costs?

Idaho's $$2.90/W average reflects a combination of near average equipment costs, above-average local utility rates ($0.180/kWh vs national avg $0.1490/kWh), and below-average solar resource (4.1 sun hours/day vs national avg 4.7).

Note on panel pricing: Prices shown reflect AVL/DomCon-compliant panels that qualify for IRA bonus credits. Non-compliant panels (Mission, JA, Canadian) are available from $0.37/W panel-only but do NOT qualify for the 30% federal tax credit or IRA bonus credits. Learn about panel compliance costs →

Idaho Solar Incentives & Policies

Net Metering

Full retail net metering

State Tax Credit

None

Property Tax Exemption

No

Sales Tax Exemption

No

⚠ 2026 Federal ITC Update

The Section 25D residential solar tax credit (30%) expired December 31, 2025. Owned residential systems installed in 2026 no longer qualify. The 48E ITC (30%) remains available for lease/PPA, commercial, and rental properties that begin construction before July 4, 2026.

States With Similar Solar Costs

State Avg $/W vs Idaho Payback Sun Hours
Idaho (you) $2.90 — 12.5 yrs 4.1
Georgia $2.90 +$0.00 14 yrs 5.1
Iowa $2.90 +$0.00 13.4 yrs 4.3
New Mexico $2.90 +$0.00 15 yrs 5
Ohio $2.90 +$0.00 13 yrs 4.5
Texas $2.90 +$0.00 12.5 yrs 5.4
View all 50 states →

Idaho Solar Cost FAQs

How much do solar panels cost in Idaho?
A typical 8kW residential solar system in Idaho costs approximately $23,200 before incentives, at an average of $2.90 per watt. Smaller 5kW systems start around $14,500, while larger 10kW systems can reach $29,000. The exact price depends on equipment quality, installer, roof complexity, and local permitting costs.
Is Idaho a cheap or expensive state for solar?
Idaho's average cost of $2.90/W is $0.17 below the national average of $3.07/W. Idaho ranks #22 out of 51 (1 = cheapest) for solar affordability. Idaho is below the national average — solar is competitive here.
What is the payback period for solar in Idaho?
The average solar payback period in Idaho is 12.5 years for an 8kW system costing $23,200 and generating approximately 10,296 kWh per year. With Idaho's average utility rate of $0.180/kWh, you'd save about $1,853 per year. After the 12.5-year payback period, the system continues producing electricity for 15+ more years.
Does Idaho have net metering?
Idaho offers full retail net metering — you receive credit for excess solar production at the same rate you pay for electricity. This is the most favorable policy for solar owners.
What solar incentives are available in Idaho?
Idaho does not offer a state solar tax credit, does not exempt solar from property tax, and does not exempt solar equipment from sales tax. The federal Section 25D residential solar tax credit (30%) expired December 31, 2025 — it no longer applies to 2026 installations on owned primary residences. The Section 48E ITC (30%) remains available for lease/PPA, commercial, and rental properties that begin construction before July 4, 2026.
How many peak sun hours does Idaho get?
Idaho receives an average of 4.1 peak sun hours per day, which is near the national average of 4.7. Peak sun hours directly affect solar production — a 8kW system in Idaho produces approximately 10,296 kWh per year.

Related Tools

Quote Comparison Tool

Compare Idaho installer quotes side-by-side.

Solar ROI Calculator

Estimate Idaho payback and savings.

Incentive Finder

Idaho rebates & tax credits.

Idaho Solar Payback

Detailed payback analysis by system size.

Idaho cost-per-watt data based on 3 ZIP code samples. Production estimates use NREL PVWatts V8 (azimuth 180°, tilt 30°, array_type 1, module_type 1, losses 14%). Utility rate averages from NREL Utility Rate API V3. The federal Section 25D residential solar tax credit expired December 31, 2025.