Solar farms are set to proliferate in sun-soaked Yakima County in central Washington.

The non-utility owner of a Washington gas-fired power plant says the facility faces unfair treatment under the state’s pending cap-and-trade program.

Initial prices for Washington cap-and-trade emissions allowances will depend on whether the state joins the Western Climate Initiative, according to new analysis.

Washington is bringing on a full-time epidemiologist to study the impact of climate change on human health.

Three owners of urban forests in Washington have sold more than $1 million in carbon credits to preserve those lands.

The Northwest stands out as an exception to the increasingly dire water situation gripping the wider West, boding well for its summer hydropower potential.

A new solar farm has been proposed for Benton County, Wash., while another massive renewable project in the county has passed one state hurdle.

The Port of Seattle is studying if and how it should get into the business of producing and distributing hydrogen, part of a strategy to increase traffic.

Fortescue Future Industries is exploring the potential of converting a disused coal mine in Washington state into a facility for producing green hydrogen.

Washington officials are working to bolster the state’s case to land one of the nation’s federally funded hydrogen hubs.