Washington is aiming to auction off enough cap-and-trade credits to cover more than 11 million metric tons of carbon emissions.

In approving a water quality certificate for a pumped storage project along the Columbia, Washington sparked protests from area tribes and some environmental groups.

Gov. Jay Inslee signed a bill requiring wind farms to turn off their blinking aviation obstruction lights at night when no low-flying aircraft are around.

A pumped storage site, solar farms and agrivoltaic ventures are among the projects receiving funding from the state's cap-and-trade fund.

The governor signed climate bills related to sustainable aviation fuel, local land-use planning, transmission planning, pumped storage and more.

State lawmakers unanimously approved a bill that directs Washington State University to study the feasibility of recycling wind turbine blades.

Gov. Jay Inslee announced that he has approved a plan by Cypress Creek Renewables to construct two large solar farms in Yakima County.

Washington LCFS credits will likely range from $35 to $45 per metric ton by 2025, lower than prices in neighboring areas, according to one carbon analysis firm.

Backers of a proposal intended to draw federal funding to create a hydrogen hub in the Pacific Northwest say their application is ready to be submitted.

Two state senators introduced a bill to provide farmers and haulers of agricultural products relief from costs arising from the state's cap-and-trade program.