Conservation groups are again suing the Montana Department of Environmental Quality over the agency's handling of environmental impacts related to a new methane gas plant in Laurel.

The Northern Plains Resource Council and Montana Environmental Information Center argue DEQ is still not adequately considering or disclosing the cumulative climate impacts of the Yellowstone County Generating Station (YCGS).

The case could be one of the first tests of the precedent set by Held v. State, a landmark Montana Supreme Court climate ruling that made international headlines last year.

The YCGS, a 175-megawatt gas plant situated near the Yellowstone River, began providing energy in late 2024. It is set to emit 25.4 million tons of greenhouse gases over its projected 32 year life span (about 770,0

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