Highwood coal plant air permit invalid, groups say

HELENA — Two environmental groups said Thursday that the state air-quality permit for the proposed coal-fired Highwood Generating Station is invalid in light of a recent federal court ruling and must be redone.

In a letter to Montana Department of Environmental Quality Director Richard Opper, the groups said that because the Highwood plant’s permit does not comply with the federal Clean Air Act’s mercury emission requirements, construction of the plant cannot lawfully begin.

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