As of September 2026, the average storage system cost in Washington is $1,193/kWh. Given a storage system size of 13 kWh, an average storage installation in Washington ranges in cost from $13,186 to $17,840, with the average gross price for storage in Washington coming in at $15,513. After accounting for state and local storage incentives, the net price you'll pay for solar can fall by thousands of dollars.
Importantly, these costs are typical for shoppers comparing storage quotes on the EnergySage Marketplace. When you compare quotes for solar panels and batteries on EnergySage's competitive marketplace, you can expect to see prices up to 20% lower than working with a single company.
System size | System cost |
|---|---|
10 kWh | $11,933 |
13 kWh | $15,513 |
20 kWh | $23,867 |
26 kWh | $31,027 |
Learn more about local WA incentives, tax credits & rebates.
$19,523 - $56,327
There are several variables that impact the price you pay for a solar + storage system: the quality of the equipment you install, the type of inverters you choose, and the storage capacity and chemistry of your battery. This is an average price range for solar + storage installations in your area, and the specifics of your project will change the final price you pay.
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See what storage costs in Washington counties
- Asotin County
- Benton County
- Chelan County
- Clallam County
- Clark County
- Cowlitz County
- Franklin County
- Grant County
- Grays Harbor County
- Island County
- Jefferson County
- King County
- Kitsap County
- Kittitas County
- Klickitat County
- Lewis County
- Mason County
- Okanogan County
- Pacific County
- Pierce County
- Skagit County
- Snohomish County
- Spokane County
- Stevens County
- Thurston County
- Whatcom County
- Whitman County
- Yakima County
FranklinWH Energy Storage Inc. aPower2
EG4 WallMount All Weather 280Ah Battery
APsystems APbattery-51.2V/10.24kWh-U
Enphase Energy " IQ Battery 10C"
Tesla PowerWall 3
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