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On December 28, 2018, the U.S. Environmental Protection Agency (“EPA”) released a pre-publication version of a proposal revisiting the cost analysis underlying the Mercury and Air Toxics Standards (“MATS Rule” or “MATS”) for coal- and oil-fired electric generating units (“EGUs”) and conducting the residual risk and technology review required by the Clean Air Act (“Proposal”).  The Proposal would reverse a previous finding, issued by EPA under the Obama Administration, that regulation of hazardous air pollutant (“HAP”) emissions from EGUs under the MATS Rule was “appropriate and necessary” but would nonetheless leave the rule in effect.  The Proposal also concludes that more stringent HAP emission limits are not warranted by the required risk and technology reviews.
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