As required under the federal Clean Air Act, the Sierra Club  has filed a “notice of intent to sue” alleging at least 1330 air quality violations by DTE Energy coal-fired power plants: St. Clair, Belle River, and Trenton Channel.

It is likely that any legal action would seek injunctive relief. DTE Energy’s responsive press release indicated it has already invested $2 billion in the last 10 years to install emissions controls, and would be spending another $1-2 billion to meet new emission regulations.  This is part of the Sierra Club's effort to draw attention to the harm caused by coal-fired pollution through its "Beyond Coal" campaign.