With the closing of the final coal-fired generation plant in Oregon by Portland General Electric Co. (PGE), the West Coast is down to one coal plant in Washington, which is slated to close in 2025.

As part of a 2010 agreement with stakeholders and regulators, PGE last week said the Boardman Generating Station in eastern Oregon closed as the electric-only utility transitions to alternative energy sources to reduce greenhouse gases. PGE owned 90% of Boardman and Idaho Power Co. had 10%.

“The closure is a major step on our path to meeting Oregon’s greenhouse gas emissions reduction goals and transforming our system to reliably serve our customers with a cleaner, more sustainable energy mix,” said PGE CEO Maria Pope.

Natural gas-fired generation remains a part of the PGE generation mix, but its replacement power for Boardman is to come from a combination of resources, including five-year contracts with the Bonneville Power Administration, the Douglas County, WA, Public Utility District and independent suppliers. A request for proposals is to be issued for additional power longer term.

PGE is also adding storage, renewables, and distributed demand response programs, Pope said.

TransAlta Corp.’s Centralia facility in Washington, one of the 1,340 MW coal units, was retired this year, with the second to be retired in 2025. Gas-fired peaking units had been added in the last 20 years, but they were sold to individual buyers. The Argus Cogeneration Expansion coal project in Southern California was shuttered in 2015, according to the California Energy Commission.