As of April 2025, the average storage system cost in King County, WA is $1397/kWh. Given a storage system size of 13 kWh, an average storage installation in King County, WA ranges in cost from $15,438 to $20,886, with the average gross price for storage in King County, WA coming in at $18,162. After accounting for the 30% federal investment tax credit (ITC) and other 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 | System Cost (after ITC) |
|---|---|---|
| 10 kWh | $13,971 | $9,779 |
| 13 kWh | $18,162 | $12,713 |
| 20 kWh | $27,941 | $19,559 |
| 26 kWh | $36,324 | $25,426 |
$21,891 - $62,724
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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