Solar installations in Washington
9,289 recorded installations — prices, growth by year, county breakdown and the installers doing the work.
Dataset updated . Sources: LBNL Tracking the Sun + city permit records + state programs + USGS/EIA utility-scale.
Most active
Top installers in Washington
| # | Installer | Installs in WA |
|---|
Growth
Installations by year
New installs per year and the running cumulative total, plus % of homes with solar (ACS housing units).
By county
Solar by county in Washington
| County | Installs | % homes | Capacity | Median $/W |
|---|---|---|---|---|
| King County | 2,056 | 0.21% | 19.3 MW | $3.41/W |
| Clark County | 541 | 0.27% | 6.2 MW | $3.58/W |
| Whatcom County | 506 | 0.50% | 5.1 MW | $2.98/W |
| Snohomish County | 485 | 0.15% | 6.5 MW | $3.30/W |
| Pierce County | 465 | 0.13% | 4.3 MW | $3.64/W |
| Benton County | 458 | 0.56% | 9.1 MW | $3.70/W |
| Spokane County | 448 | 0.20% | 4.1 MW | $4.11/W |
| Yakima County | 328 | 0.36% | 4.8 MW | $2.82/W |
| Kittitas County | 275 | 1.1% | 45.0 MW | $2.61/W |
| Thurston County | 271 | 0.22% | 2.8 MW | $3.55/W |
| Kitsap County | 237 | 0.20% | 2.1 MW | $3.96/W |
| Skagit County | 235 | 0.42% | 3.0 MW | $3.01/W |
| Franklin County | 187 | 0.61% | 1.9 MW | $3.69/W |
| Island County | 134 | 0.32% | 1.3 MW | $3.01/W |
| Walla Walla County | 120 | 0.48% | 1.2 MW | $3.92/W |
| Clallam County | 106 | 0.28% | 944 kW | $4.36/W |
| Jefferson County | 103 | 0.53% | 1.2 MW | $3.96/W |
| Cowlitz County | 99 | 0.22% | 926 kW | $3.77/W |
| Lewis County | 78 | 0.22% | 695 kW | $3.74/W |
| San Juan County | 62 | 0.44% | 600 kW | $3.04/W |
| Mason County | 43 | 0.13% | 585 kW | $3.68/W |
| Okanogan County | 41 | 0.19% | 321 kW | $3.90/W |
| Skamania County | 38 | 0.64% | 327 kW | $3.44/W |
| Grays Harbor County | 32 | 0.09% | 272 kW | $3.82/W |
| Klickitat County | 29 | 0.27% | 234 kW | $3.32/W |
| Stevens County | 29 | 0.13% | 320 kW | $3.28/W |
| Grant County | 25 | 0.06% | 304 kW | $4.30/W |
| Whitman County | 24 | 0.11% | 382 kW | $3.99/W |
| Pacific County | 18 | 0.11% | 178 kW | $3.64/W |
| Ferry County | 17 | 0.41% | 251 kW | $4.09/W |
| Lincoln County | 14 | 0.24% | 126 kW | $4.26/W |
| Adams County | 11 | 0.16% | 55.9 MW | $3.88/W |
| Wahkiakum Countylimited | 8 | 0.36% | 58 kW | $3.93/W |
| Chelan Countylimited | 7 | 0.02% | 37 kW | $3.65/W |
| Asotin Countylimited | 4 | 0.04% | 35 kW | $3.87/W |
| Columbia Countylimited | 4 | 0.18% | 49 kW | $4.30/W |
| Douglas Countylimited | 4 | 0.02% | 36 kW | $4.56/W |
| Pend Oreille Countylimited | 3 | 0.04% | 31 kW | $3.93/W |
| Garfield Countylimited | 1 | 0.08% | 11 kW | $4.24/W |
Counties derived from installation ZIP codes (Census ZCTA crosswalk) — approximate at boundaries. Counties marked limited have under 10 recorded installs, so their medians and penetration are indicative only. % homes = recorded installs ÷ housing units (U.S. Census ACS 5-Year, B25001).
Search every recorded Washington installation — by installer, size, date, storage and equipment.
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Top solar equipment in Washington
| # | Panel manufacturer | Systems |
|---|---|---|
| 1 | Itek Energy LLC | 35 |
| 2 | CSI Solar Co., Ltd. | 8 |
| 3 | SunPower | 7 |
| 4 | HYUNDAI ENERGY SOLUTIONS CO., LTD. | 5 |
| 5 | REC Solar | 4 |
| 6 | SolarWorld | 3 |
| 7 | Silfab Solar Inc. | 3 |
| 8 | Qcells North America | 3 |
| # | Inverter manufacturer | Systems |
|---|---|---|
| 1 | SMA America | 14 |
| 2 | SolarEdge Technologies Ltd. | 12 |
| 3 | Yaskawa Solectria Solar | 11 |
| 4 | Fronius International GmbH | 8 |
| 5 | HiQ Solar | 7 |
| 6 | Fronius USA | 7 |
From recorded equipment on Washington systems (Tracking the Sun + state/permit data); counts are systems where the manufacturer is known.
Developers
Top solar developers in Washington
| # | Developer | Systems |
|---|---|---|
| 1 | Puget Sound Energy | 4 |
| 2 | Greenbacker | 3 |
Developer/EPC named on the permit or program record — often the same firm as the installer.
Frequently asked questions
How many solar installations are there in Washington?
PanelCensus records 9,289 solar installations in Washington, totalling 367.9 MW of capacity — about 0.28% of the state's 3,262,667 housing units (U.S. Census ACS) — compiled from LBNL's Tracking the Sun, city permit records, state programs and USGS/EIA utility-scale data. (Coverage depends on what the state publishes, so actual totals are higher.)
How much does solar cost per watt in Washington?
The median installed price across priced systems in Washington is $3.26/W pre-incentive. Year-by-year medians are shown on this page.
Who are the biggest solar installers in Washington?
No resolved installers recorded.