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Full Home Electrification in Washington

Optimal sequencing and combined ROI for solar, battery, heat pump, and heat pump water heater — the full electrification stack.

Full home electrification in Washington means replacing fossil fuel equipment with electric alternatives — solar panels, battery storage, heat pump HVAC, and heat pump water heater — and sequencing the installations to maximize ROI. The order matters because each component changes your baseline electricity consumption, affecting the optimal sizing and payback of subsequent components.

Optimal Installation Sequence

1

Heat Pump HVAC

Install first because it changes your electricity consumption baseline. Your post-heat-pump consumption determines optimal solar system size.

Cost: $12,000Credit: $3,600 ITCNet: $8,400
2

Heat Pump Water Heater

Second, for the same reason — it adds to your electricity load before you size solar.

Cost: $3,500Credit: $1,050 ITCNet: $2,450
3

Solar (7 kW)

Size after electrification is complete. System sized to offset total electric consumption including heat pump loads.

Cost: $19,950Credit: $5,985 creditsNet: $13,965
4

Battery Storage (13.5 kWh)

Last — battery size depends on solar production, consumption pattern, and utility rate structure.

Cost: $12,000Credit: $3,600 ITCNet: $8,400

Total Stack Economics

ComponentGross CostCreditsNet Cost
Solar (7 kW)$19,950$5,985$13,965
Battery (13.5 kWh)$12,000$3,600$8,400
Heat Pump HVAC$12,000$3,600$8,400
HP Water Heater$3,500$1,050$2,450
Total$47,450$14,235$33,215

The full electrification stack in Washington costs $33,215 after all IRA credits. The combined savings from eliminated gas bills, reduced electricity costs via solar, and TOU arbitrage through battery storage compound to create value greater than any single component alone. The solar 25-year NPV of -$1,502 represents only the electricity savings — add heat pump fuel savings and battery arbitrage for the complete picture.

Frequently Asked Questions

Is full electrification 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 full electrification 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 full electrification 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 vs Grid›Solar + Battery›Heat Pump›

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