MySolarCheck

Solar Panel Cost & Installation Data in Washington

Observed Records
6,327
Reported Capacity
92 MW
Observed Avg Cost
$3.61/W

Median: $3.48/W

Dataset Rank
#24

96% residential

11.9¢
Residential Rate (EIA 2024)
3.5h
Peak Sun Hours/Day
27.6 yrs
Est. Payback Period
$1,896
Est. Annual Savings

Environmental & Community Impact

CO₂ Offset/Year
102,628 tons
CO₂ Offset/System/Year
10.5 tons
Installations per 10K Residents
8.2
State Population
7,688,549
Est. Annual Production/System
15,930 kWh

Estimates use average system size, a 3.5h/day state solar-resource proxy and a 14% system-loss assumption. Payback excludes financing and incentives. Context sources: NREL, EIA and EPA eGRID (0.709 metric tons CO₂/MWh).

System Overview

Avg System Size
14.5 kW

Cost Trend ($/W)

Avg Cost per Watt

2012201320142015201620172018

Installation Growth (Last 5 Years)

Installer Names in the Source Records

InstallerObserved Records
-16,327

Panel Brands in the Source Records

BrandObserved Records
Itek Energy LLC4,124
Silfab Solar Inc.632
SunPower369
LG Electronics Inc.254
Qcells North America219
CSI Solar Co., Ltd.178
SolarWorld177
SolarCity Corp91
Heliene62
REC Solar54

County Records - Washington

CountyObserved RecordsReported Capacity
King1,38512.1 MW
Clark5725.2 MW
Snohomish4685.3 MW
Spokane4333.6 MW
Benton3974.3 MW
Pierce3683.1 MW
Yakima3445.3 MW
Whatcom3412.9 MW
Kittitas2283.1 MW
Franklin1871.9 MW
Thurston1571.5 MW
Skagit1461.9 MW
Kitsap1371.2 MW
Walla Walla1201.2 MW
Clallam1050.9 MW

Washington Solar Incentives

State-program snapshot

Is Solar Worth It in Washington?

Modeled homeowner analysis

Primary dataset: LBNL Tracking the Sun 2024 release. Counts represent records in the source release, not a complete statewide census.