Washington

Washington solar in 2026

Washington has the policy that solar advocates usually ask for: retail-rate net metering. It also has inexpensive electricity, modest solar production in much of the state and no live solar sales-tax exemption. That is why the honest Washington page is not a breathless payback promise. The protection is good. The economics can still be slow, especially west of the Cascades.

Washington sun has a west and an east

Yakima is the clear production leader in this four-city set. Vancouver and Seattle are lower. That does not mean a Seattle system cannot work. It means you should not use eastern Washington output to sell a western Washington roof.

Method: PVGIS v5.2 model runs by Solar Learning Lab on August 18, 2026, using the NSRDB radiation database. Assumptions: fixed roof mount, south facing, 30 degree tilt, 14 percent losses. Your roof will differ. The 14.06 kW example matches the EnergySage Washington average system.

Washington tax treatment: one live option, one expired one

Washington has a real net-metering right, with real endpoints

RCW 80.60 requires utilities to offer retail-rate net metering through June 30, 2029, unless cumulative capacity reaches 4% of the utility's 1996 peak demand sooner. Eligible systems can be up to 100 kW. This is a useful statutory protection because it values exports at the retail rate under the program. It is also a bounded protection. A serious proposal should identify the serving utility and ask for its current position relative to the 4% trigger instead of treating the statewide statute as an unlimited guarantee.

The investor-owned utilities subject to the net-metering framework are Avista, Pacific Power, and Puget Sound Energy. The homeowner's address still determines which utility process applies. Washington has 934 MWdc installed, ranks 39th nationally, and gets 1.30% of state electricity from solar, with page data as of May 2026. That modest statewide solar share fits the central economic tension: retail net metering helps, but the 14.95 cent residential price and varied solar production leave little room for casual assumptions.

Tax treatment needs especially careful reading. The sales-tax exemption for solar machinery and equipment in RCW 82.08.963 expired June 30, 2018. The solar hot-water exemption in RCW 82.08.835 expired July 1, 2009. Neither is available to reduce a current solar quote. If either amount appears as a deduction, it must be removed. That is not conservative modeling. It is the current legal status.

A separate personal-property-tax exemption applies to qualifying renewable energy generation or storage facilities where construction began on or after July 1, 2023. It runs for a 10- or 15-year term, with applications due by March 31 of the year before the exemption year. The accompanying solar excise rate is $80 per MW per month for the 10-year term and $75 for the 15-year term. Confirm eligibility before assigning that property-tax treatment to a residential project.

Sources: Washington Department of Commerce, Washington UTC, Washington Department of Revenue, and SEIA Washington.

Stress-test the long Washington return

The calculator starts with a retail-value assumption because that is the current statutory net-metering structure. It cannot tell you whether a utility is near its 4% capacity trigger. Keep the utility escalation slider conservative. Cheap grid electricity is the reason a correctly modeled Washington project can take patience.

Washington installers with published review records

The review sample spans Puget Sound with one Bellingham firm. A strong Washington bid earns trust by showing a conservative rate-escalation case and by explicitly removing the expired sales-tax exemption. Full retail net metering is a real asset. It does not turn cheap electricity into expensive electricity.