Solar Panel Cost in Washington (2026)
Installed solar in Washington runs about $2.75 per watt — roughly 7% above the national average of $2.58/W. With the federal residential tax credit (25D) gone as of 2026, payback here rests on a $0.11/kWh power price and 3.7 daily peak sun hours.
Worked example: a typical $150/month home in Washington
A $150/month electric bill in Washington works out to about 16,364 kWh a year. Sizing a cash-purchase system to cover 100% of that:
System size
15.2 kW
Panels
38
Annual offset
100%
Gross cost
$44,300
Federal credit (25D)
$0
Expired 12/31/2025 — $0
State incentive
$0
Net cost
$44,300
Payback
18.7 yr
25-year savings
$21,410
Last updated June 30, 2026
Washington solar numbers
- Installed price
- $2.75 / watt
- Electricity price
- $0.11 / kWh
- Peak sun hours
- 3.7 hrs/day
- State incentive
- 0%
- Net-metering value
- 100% of retail
Local context: The cheapest power in the country and low sun make Washington one of the slowest solar paybacks.
Estimate your own Washington system
Adjust the bill, ownership, and battery options below — it's pre-set to Washington's pricing and sun hours.
Estimated system cost
$53,853–$69,947
21.6 kW54 panels
Low $54kMost likely ~$61,900High $70k
Federal tax credit
— expired Dec 2025, we won't pretend otherwise
$0
State & utility incentives
$0
Est. annual savings
$2,567
Payback period
~18.4 yr
Net cost
$54k–$70k
25-year net savings
+$31,477
iA ballpark estimate for planning — not a final quote.
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