The NRG Energy electric plant Louisiana Generating will pay $14 million in fines and environmental-improvement projects to settle pollution claims.

Justice Department officials heralded the settlement Tuesday as the largest Clean Air Act agreement in Louisiana history.

The government had sued the company in 2009 over the Big Cajun II coal-fired power plant in New Roads, La.

Assistant Attorney General Ignacia Moreno called Big Cajun II Power Plant "the largest source of illegal air pollution in Louisiana."