A proposed massive solar farm is stirring controversy in southeastern Washington, pitting farmers and unions against local officials and the region’s GOP.

Two Washington agencies said they reached a “major milestone” in nailing down new rules to implement the state’s 2019 Clean Energy Transformation Act.

Washington’s first industrial-scale green hydrogen production facility has fallen an additional six months behind on its original start date.

EV drivers along the West Coast's I-5 should soon feel less range anxiety thanks to funds provided by the Infrastructure Investment and Jobs Act.

Washington state lifted its remaining drought designations because of an unexpectedly cool and wet May and June.

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.