The Project will include the injection of powdered activated carbon (PAC) for the control of mercury emissions on the new generation unit and the existing generation unit at Holcomb Station. The Project will meet the New Source Performance Standards (NSPS) for mercury emissions as well as the provisions of the new Clean Air Mercury Rule. The use of PAC technology for both units at the Holcomb Station will meet or exceed all federal regulatory requirements.
The plant will be operated in a way that will result in total mercury emissions from both units, including the existing 362-MW Holcomb Station and the additional 895-MW unit, will be less than the current emissions from the single unit at the existing Holcomb Station. These emissions will vary over time, but the draft permit contains limits that will always restrict emissions to a level that is 79 percent lower than limits set forth in the federal regulations.
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