The weak case: storage as a savings device
Washington net metering under RCW 80.60 credits excess kilowatt hours at the retail rate. A battery therefore is not rescuing value that export would otherwise lose, which is the main economic argument for storage in states with poor export compensation.
The retail rate itself is low. Washington averaged around 15 cents per kWh in mid-2026, so the value of shifting a kilowatt hour from one time of day to another is small in absolute terms.
There is one genuine economic benefit: storage moves generation into your own consumption rather than into credit that may be forfeited to the utility on April 30. Credit that never accumulates cannot be given away.
That is real but modest, and it is a reason to size a battery sensibly rather than a reason to buy the largest one offered. Be sceptical of any Washington quote where a battery pays for itself on arbitrage.
The strong case: keeping the lights on
Solar alone does not keep your house powered during an outage. A standard grid-tied inverter disconnects when the grid goes down, for the safety of line workers, and that surprises more homeowners than any other fact about solar.
Backup requires a battery plus the right inverter and switching arrangement. If outage resilience is why you are considering storage in Everett, it has to be specified as equipment in the quote rather than implied.
Ask precisely which circuits would be backed up and for how long under a realistic winter load. Whole-home backup and essential-circuits backup are different systems at different prices, and the answer should be a list of circuits.
Ask what happens after the first day. A multi-day winter outage with low solar production is the scenario that matters here, and a battery sized for an evening is a different product from one intended to ride out a storm.
Making the quote say which case it is making
The practical request is simple: ask for the system priced and modelled both with and without the battery, so the incremental cost of storage is visible as a number rather than absorbed into a package price.
Then ask what portion of the projected savings comes from the battery. In Washington that portion should be small, and a quote showing otherwise deserves a specific explanation of the mechanism.
That does not make the battery a bad purchase. Resilience is a legitimate thing to buy, and in an outage-prone area it may be the main reason to do the project at all. It is simply not a savings device here.
Ask also whether the battery qualifies for anything from your own utility. Public utility districts set their own programmes on top of state law, so the answer depends on who bills you rather than on the state.
Rebuilding the Washington arithmetic
The 30 percent federal Residential Clean Energy Credit under Section 25D expired for property placed in service after December 31, 2025, so a cash or loan purchase in Everett receives no federal tax credit on either the panels or the battery. Section 48E survives at 30 percent for third-party owners under leases and power purchase agreements.
Washington has no state income tax and therefore no state solar credit.
What exists is the sales and use tax exemption under RCW 82.08.962 on systems up to 100 kW AC through December 31, 2029, covering labour as well as equipment, and retail-rate net metering with the April 30 forfeit.
Then add the electricity you stop buying at your actual rate, and price the resilience benefit honestly as a separate thing you are choosing to buy rather than folding it into a savings number.