It’s Monday, October 19, and the Beaver State has felled its last coal plant.

It’s always good news for the environment when a coal plant closes — but when a state’s only coal-fired power plant shuts down? That’s a true milestone.

Portland General Electric (PGE) permanently shuttered Oregon’s only remaining coal-fired power plant last week. The Boardman plant in eastern Oregon opened in 1977 and was the state’s largest single source of emissions, producing approximately 2 million tons of greenhouse gases annually, according to the company. (Columbia Riverkeeper, an environmental advocacy group in the state, says it’s more like 4 million tons a year.)

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The closure is the result of a lawsuit brought by environmental groups against PGE in 2008 that alleged that the Boardman plant had been violating the Clean Air Act for decades. Instead of installing costly pollution controls that would have allowed the plant to continue operating until 2040, PGE agreed to a settlement in 2011 that would shutter the coal plant 20 years early and require the company to pay a $2.5 million environmental penalty.

Oregon will still get coal-fired power from plants in other states, but there’s a deadline on that, too, thanks to a state mandate to eliminate imported coal-fired power by 2035. Hydropower from dams in the region and other renewable energy sources will fill the void left by Boardman’s closure.

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“PGE’s Boardman closure is a major step on our path to meeting Oregon’s greenhouse gas emissions reduction goals,” PGE president and CEO Maria Pope said in a statement about the closure.

Zoya Teirstein

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