SB5555 – Excludes most solar systems from renewable energy tax incentives.
Prime Sponsor – Senator Ericksen (R; 42nd District; Bellingham)
Current status – Had a hearing before the Senate Committee on Environment, Energy & Technology February 6th. Still in committee by 2019 cutoff; reintroduced and retained in present status for 2020 session. Failed to make it out of committee by 2020 cutoff; dead bill.
Next step would be – Action by the committee.
Legislative tracking page for the bill.

Summary –

For a solar system to be eligible for renewable energy tax incentives, all of its components, including the solar cells, would have to be produced or manufactured in the United States, or in a facility that the Department of Ecology certified as meeting all the relevant Washington State environmental, health, and safety standards.