Washington State Ferries expects to convert from solely diesel fuel engines in its vessels to hybrid fuel-battery propulsion.

The Washington Fish and Wildlife Commission designated ferruginous hawks as endangered; climate change and wind turbines are two factors in the decision.

Dozens of solar developers want to build in Eastern Washington, but the majority are unfamiliar with the sensitive habitat that is prime turf for solar farms.

Feedback split along predictable lines on Washington’s efforts to adopt California’s strict standards on zero-emission medium- and heavy-duty trucks.

Washington officials are moving to respond to the state's extreme drought after admitting they were taken by surprise by how quickly it developed.

Washington’s first pumped storage generator is expected to go online between 2028 and 2030, if it can obtain the needed state and federal approvals.

A Washington-based fusion energy company is expanding its operation in the drive to become the first to develop a commercially viable fusion reactor.

Washington officials have kicked off their work to adopt California’s transportation emissions standards, which will set targets for the adoption of ZEVs.

Washington’s King County Council passed a law requiring the installation of charging stations at multi-unit dwellings in its unincorporated areas.

Blaming climate change, Washington Gov. Jay Inslee declared a drought emergency for nearly all of the state.