Improving reliability and capacity of the electric transmission system in Washington state.

HB 1673 creates the Washington Electric Transmission Authority to upgrade the state's power grid, directly affecting utilities, ratepayers, and clean energy developers. The authority will coordinate long-term transmission planning, accelerate grid upgrades, and prioritize access to renewable energy while addressing reliability threats from extreme weather and growing demand. Key provisions include requiring the authority to evaluate "nonwires alternatives" (like grid software upgrades instead of new lines), protect vulnerable communities, and submit annual reports to the legislature. The bill aims to support Washington's carbon-neutral electricity goals by 2030 through a more resilient, regional transmission system.