Skip to main content
Elovane
Home›Washington›Solar vs Grid

Solar vs. Grid Electricity in Washington

Compare the 25-year cost of solar energy to staying on grid electricity, accounting for utility rate escalation, panel degradation, and IRA credits.

In Washington, the average homeowner pays $11.2¢/kWh for grid electricity. With historical escalation of 3-8% per year, this rate is projected to reach $29.9¢/kWh in 25 years (at 4% escalation). A 7 kW solar system locks in an effective rate of $0.187/kWh for the life of the system.

The math is straightforward: grid electricity costs more every year while solar LCOE stays fixed. By year 10, the utility rate reaches approximately $16.6¢/kWh, nearly 0.9x the solar LCOE. This growing gap is the engine that drives solar ROI.

25-Year Cost Comparison

MetricSolarGrid Only
Effective rate (year 1)$0.187/kWh$11.2¢/kWh
Effective rate (year 25)$0.187/kWh$29.9¢/kWh
25-year discounted cost$31,476$23,168
Net savings (NPV)-$1,502

Solar in Washington produces 1,100 kWh per installed kW per year. A 7 kW system generates 7,700 kWh annually, offsetting 73% of the average household's 10,500 kWh annual consumption. After the 17-year payback period, every additional year of operation is pure savings.

Frequently Asked Questions

Is solar vs grid worth it in Washington?
With Washington's average utility rate of $11.2¢/kWh and solar irradiance of 1,100 kWh/kW/yr, the 25-year NPV for a 7 kW solar system is -$1,502. Use Elovane to model your specific situation.
What incentives are available for solar vs grid in Washington?
The federal IRA provides a 30% ITC for solar and battery installations (through 2032) and up to $2,000 in 25C credits for heat pumps. Income-qualified households may receive additional point-of-sale rebates through the HOMES and HEAR programs.
How long does solar vs grid take to pay back in Washington?
Solar panels in Washington pay back in approximately 17 years. Battery payback depends on TOU rate spreads. Heat pump payback ranges from 5-12 years depending on current fuel costs and local electricity rates.

Other Comparisons for Washington

Solar + Battery›Heat Pump›Full Electrification›

Run Your Washington Analysis

Get a personalized 25-year NPV with Monte Carlo confidence intervals, IRA credit stacking, and optimal electrification sequencing.

Calculate My ROI ›