Idaho Solar Overview
I'll be straight with you—Idaho is one of the harder states to make solar pencil out quickly. The sunshine is great, especially around Boise and Twin Falls, but Idaho Power's rates are among the cheapest in America thanks to hydropower. When electricity costs $0.10/kWh, your panels produce plenty of power but each kilowatt-hour just isn't worth as much. That said, if you're building new and can integrate solar efficiently, or you value energy independence, it can still make sense for the long haul.
Idaho enjoys 200+ sunny days per year, with southern regions like Boise, Twin Falls, and Pocatello getting excellent solar irradiance. The challenge isn't the sun—it's that Idaho's electricity is already cheap. Low rates are great for your current bills but make it harder for solar to compete financially.
Regional Differences
Southern Idaho gets significantly better solar production than the northern panhandle:
- Southern Idaho (Boise, Twin Falls): 4.8-5.0 peak sun hours
- Eastern Idaho (Pocatello, Idaho Falls): 4.6-4.8 peak sun hours
- Northern Idaho (Coeur d'Alene): 4.2-4.5 peak sun hours
State Incentives
Idaho Programs
- Sales tax exemption: Solar equipment purchases exempt from state sales tax (~6% savings)
- Property tax exemption: Solar value excluded from property tax assessments
- Net metering: Available but at reduced rates (see below)
- No state tax credit: Idaho does not offer a state solar tax credit
Federal Tax Credit (2026)
| Ownership Type | Federal Credit | Notes |
|---|---|---|
| Cash Purchase | None | 25D residential credit ended Dec 2025 |
| Solar Loan | None | Same as cash—no federal credit available |
| PPA/Lease | 30% | Solar company claims credit, passes savings to you (through 2027) |
Net Metering
Idaho Power Policy
- Credit rate: Reduced export rate (not full retail)
- Program: On-Site Generation program
- System limit: Up to 25 kW for residential
- Monthly rollover: Credits carry forward
- Annual settlement: Excess credits paid at avoided cost rate
Rocky Mountain Power (Eastern Idaho)
- Service area: Eastern Idaho (Idaho Falls, Pocatello)
- Net metering: Schedule 135 for residential
- System limit: Up to 25 kW
- Credit rate: Varies by rate schedule
Solar Costs
Idaho solar costs run $2.50-$2.90 per watt, below the national average of $2.75-$3.25. Lower labor costs and competitive markets help keep prices down.
| System Size | Gross Cost | After Sales Tax Exemption | Annual Production |
|---|---|---|---|
| 6 kW | $15,000-$17,400 | ~$14,100-$16,400 | 8,400-9,000 kWh |
| 8 kW | $20,000-$23,200 | ~$18,800-$21,800 | 11,200-12,000 kWh |
| 10 kW | $25,000-$29,000 | ~$23,500-$27,300 | 14,000-15,000 kWh |
Savings & Payback Analysis
| System Size | Annual Savings | Payback Period | 25-Year Savings |
|---|---|---|---|
| 6 kW | $840-$900 | 16-18 years | $7,000-$10,000 |
| 8 kW | $1,120-$1,200 | 15-18 years | $9,000-$13,000 |
| 10 kW | $1,400-$1,500 | 15-18 years | $12,000-$17,000 |
Those 25-year savings numbers look modest compared to high-rate states like California or Massachusetts where you might save $50,000+. That's the reality of Idaho's cheap power. But here's the thing—rates will likely increase over 25 years, and your solar panels lock in energy costs at today's price. If Idaho Power rates climb 3-4% annually, your savings could double.
Major Utilities
Idaho Power
- Service area: Southern Idaho, Boise metro, Treasure Valley
- Customers: ~600,000
- Average rate: ~$0.10/kWh
- Net metering: On-Site Generation program (reduced export rates)
- Interconnection: Required for grid-tied systems
Rocky Mountain Power
- Service area: Eastern Idaho (Idaho Falls, Pocatello area)
- Average rate: ~$0.10-$0.11/kWh
- Net metering: Schedule 135
- Programs: Time-of-use rates available
Rural Electric Cooperatives
- Coverage: Various rural areas throughout Idaho
- Net metering: Varies by co-op—contact directly
- Rates: Generally competitive with IOUs
Production Estimates by Region
- Southern Idaho: 1,450-1,500 kWh per kW installed annually
- Eastern Idaho: 1,400-1,450 kWh per kW installed annually
- Northern Idaho: 1,300-1,400 kWh per kW installed annually
- Best production months: May-August
The Bottom Line
Idaho's solar economics are challenging but not hopeless. The excellent sunshine is real—4.5-5.0 peak sun hours rivals many solar-friendly states. But when you're starting with $0.10/kWh electricity thanks to Idaho's abundant hydropower, the financial case takes longer to develop.
Solar makes the most sense in Idaho for homeowners who:
- Value energy independence over quick financial returns
- Are building new homes where solar integrates efficiently
- Expect to stay long-term (15+ years) to realize full savings
- Want to hedge against future rate increases
- Have excellent south-facing roof exposure
If you're chasing fast payback, Idaho isn't your state. But if you're playing the long game and want to lock in energy costs while producing clean power, the math can work—just go in with realistic expectations.
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