Solar in Spokane, WA: 2026 Cost, Savings & Payback
Calculate 2026 solar panel cost, payback, and 25-year bill savings in Spokane, Washington. Based on 3.1 peak sun hours/day, 10.3¢/kWh average electricity rate, Avista Utilities utility context, and current IRS guidance for the ended federal residential clean energy credit.
Solar in Spokane, WA: quick answer
A typical 6kW solar system in Spokane costs about $16,440 before local or state incentives. For 2026 installs, the federal residential clean energy credit is modeled as $0, so the estimated cost remains about $16,440 before any local incentive. It produces about 5,431 kWh per year from 3.1 peak sun hours/day, saves about $558 per year, and reaches payback in about 29.5 years.
2026 6kW Cost
$16,440
Monthly Savings
$47
Production / kW
905 kWh
Panel Count
~15
3.1
Peak Sun Hours/Day
10.3¢
Avg Rate (¢/kWh)
29.5 yr
Payback Period
$19k
25-Year Savings
Spokane Solar Overview
Calculate Your Spokane Solar Savings
Spokane average: $122/mo
South-facing roofs produce the most energy
Add $8,000-$12,000 for whole-home battery backup
Annual Production
kWh/year
Annual Savings
per year
Net System Cost
after 2026 federal credit
Payback Period
break-even time
Bill Offset and Export Assumptions
Current Annual Bill
$1,464
Estimated Usage
14,241 kWh
Bill Offset
38%
Used On Site
100%
Exported production is discounted in this planning model instead of being treated as a guaranteed one-for-one bill credit. For Spokane, verify the current Avista Utilities export-credit method and any fixed monthly charges before relying on the payback number.
25-Year Total Savings
$19,060
Monthly Savings
$47
2026 Federal Credit
$0
Cumulative Savings vs System Cost
Cost Breakdown
| Item | Spokane | National Avg |
|---|---|---|
| Gross System Cost (6kW) | $16,440 | $17,100 |
| 2026 Federal Residential Credit | -$0 | $0 |
| Net System Cost | $16,440 | $17,100 |
| Cost Per Watt | $2.74/W | $2.85/W |
Solar Potential in Spokane
Sun Hours vs National Average
Spokane gets 31% less sun than the national average, but high-efficiency panels compensate.
Climate Advantages
- 160 sunny days per year
- Average temperature: 50.6°F — cooler temps actually improve panel efficiency
- Average roof size: 1,847 sq ft — enough for a 102-panel system
Spokane Solar Incentives & Programs
Federal Investment Tax Credit (ITC)
For 2026 planning, JouleIO does not subtract a federal residential clean energy credit. The IRS says the Residential Clean Energy Credit was 30% for eligible property installed from 2022 through December 31, 2025, and is not available for property placed in service after December 31, 2025.
Source: IRS Residential Clean Energy Credit and IRS One Big Beautiful Bill provisions.
Washington State Incentives
Washington sales tax exemption for solar; net metering at retail rate
Net Metering — Avista Utilities
Avista Utilities offers net metering in Spokane. Earn credits for excess solar energy sent to the grid, reducing your electric bill further.
Environmental Impact in Spokane
2.3
Tons CO2 Offset/Year
37
Equivalent Trees Planted
0.5
Homes Worth of Energy
Based on 5,431 kWh annual production with a 6kW system. EPA average: 0.417 metric tons CO2 per MWh, 10,632 kWh per US home.
Solar Energy in Spokane, Washington
Spokane, Washington receives an average of 3.1 peak sun hours per day, which, while below the national average, still makes solar a viable option with modern high-efficiency panels. With electricity rates averaging 10.3¢ per kWh from Avista Utilities, below the national average, but with rates rising 2-3% annually, the long-term savings are still meaningful.
A typical 6kW solar system in Spokane produces approximately 5,431 kWh per year, saving homeowners an estimated $558 annually. The system pays for itself in about 29.5 years, after which you enjoy essentially free electricity for the remaining -4+ years of the system's warranty life.
Spokane has a solar penetration rate of 1.7% — indicating early-stage solar adoption with tremendous growth potential as prices continue to fall. The cost of living index of 107 (national average: 100) is near the national average.
Other Cities in Washington
Bellevue, WA
Everett, WA
Kennewick, WA
Olympia, WA
Seattle, WA
Tacoma, WA
Vancouver, WA
Methodology & Solar Data Sources for Spokane
How we calculate Spokane solar potential and savings: Solar production estimates use NREL's PVWatts calculator methodology, applied to Spokane's specific solar irradiance (peak sun hours), tilt angle, and azimuth. Cost figures combine NREL's Annual Technology Baseline for system pricing, ENERGY STAR's database for residential PV averages, and EIA Form 861 utility rate data for Washington.
- Solar irradiance for Spokane: based on NREL National Solar Radiation Database (NSRDB) — 30-year average peak sun hours per day.
- System sizing assumes residential rooftop installation with standard 350-400W panels, calibrated to typical Spokane household electricity usage.
- Federal tax credit: modeled as 0% for 2026 residential installations because IRS guidance says the Residential Clean Energy Credit is not available for property placed in service after December 31, 2025.
- Net metering assumes 1:1 retail-rate compensation typical in Washington (verify with local utility — some have shifted to net billing or avoided-cost rates).
- System lifetime standard 25 years with annual degradation of 0.5%/year per industry warranty norms.
Authoritative US solar data sources:
- NREL PVWatts Calculator — official US solar production estimator
- NREL National Solar Radiation Database — 30-year solar irradiance data
- IRS Residential Clean Energy Credit — 2026 federal residential credit status
- IRS One Big Beautiful Bill provisions — clean energy credit expiration overview
- DSIRE — State Solar Incentives — searchable database for Washington
- EIA Electric Power Monthly — Washington utility rate data
- ENERGY STAR Solar — efficient solar product database
Solar Disclaimer: Solar savings vary based on roof orientation, shading, system quality, installer markup, financing terms, utility rate plan, and policy changes. Always get 3+ quotes from NABCEP-certified installers and review contracts carefully. Tax credit eligibility depends on tax liability — consult a tax professional.
Reviewed by Brazora Monk · Last updated 2026 · NREL irradiance data per NSRDB latest release
Frequently Asked Questions
How much do solar panels cost in Spokane, WA?
The average cost of a 6kW solar panel system in Spokane is approximately $16,440 before local or state incentives ($2.74/watt). For 2026 planning, this calculator does not subtract a federal residential clean energy credit because IRS guidance says the credit is not available for property placed in service after December 31, 2025. Washington sales tax exemption for solar; net metering at retail rate
How many solar panels do I need in Spokane, WA?
A typical 6kW residential solar system in Spokane needs about 15 panels if each panel is rated near 400 watts. That system produces about 5,431 kWh per year in this estimate, or roughly 905 kWh per installed kW before shading, roof orientation, and inverter losses are customized.
How many peak sun hours does Spokane get?
Spokane, WA receives an average of 3.1 peak sun hours per day and approximately 160 sunny days per year. While below the national average, solar panels can still provide significant savings due to advancing panel technology.
What is the solar payback period in Spokane?
The average solar payback period in Spokane is approximately 29.5 years for a 6kW cash-price estimate before local or state incentives. After payback, your solar panels generate essentially free electricity for the remaining warranty life. Over 25 years, bill savings can reach about $19,060 before subtracting installation cost.
Does Spokane have net metering?
Yes, Spokane has access to net metering through Avista Utilities. This allows you to earn credits for excess solar energy sent to the grid, but the final savings depend on the current utility tariff and fixed monthly charges.
Is solar worth it in Spokane, WA in 2026?
Solar may still be worthwhile in Spokane, especially for homeowners with high usage or strong local incentives, but the 29.5-year payback means quote comparison matters. For 2026 installs, JouleIO does not assume a federal residential credit; local incentives and net metering are the main financial drivers.