Washington’s first cap-and-trade auction earned the state nearly $300 million in revenue and unloaded all allowances on offer.

A coalition of builders and other parties filed suit to revoke new state rules that ban the installation of gas-fired space and water heaters in new buildings.

The Washington House voted to require wind turbine lights be turned off at night when not triggered by airplanes.

Washington’s first cap-and-invest auction took place Tuesday, but initial results will not be released until March 7.

Critics of a Washington bill to impose a road usage fee on electric and hybrid vehicles lined up to testify at the state capitol.

The bill to create a road usage fee for electric and hybrid vehicles in Washington is more of a conversation starter than a nailed-down piece of legislation.

A legislative effort to make Washington more attractive to the alternative jet fuel industry has reached the state Senate’s Ways and Means Committee.

A Washington House committee passed a bill to add advanced nuclear to the alternative power sources that the state can use to replace fossil fuels.

The Western EIM tariff changes allow generators to include the costs of GHG compliance associated with Washington’s cap-and-trade program in their energy bids.

The push for decarbonization will transform Washington from a key exporter of electricity to a net importer by mid-century, a state agency has found.